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#1
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Alpine deck blew my subs!
Okay so I was having problems with my Alpine CDA 7878 deck over two
weeks ago. On that day it was playing just fine at a low volume level and then all of sudden some funny gobbledy goo sounds came out of the speakers, followed by the message "ERROR" and the CD player not working and not ejecting. The deck's radio still worked and I notice I was getting NO BASS.. hmm strange I thought. So I take it in to the shop that installed it, he says the deck is busted and that the reason I have no bass is because the subs are blown or something is wrong with them. I was like wtf how could I have blown them, I wasn't playing them loud AT ALL, I wasn't really even listening to music when the whole thing happened. He says the deck probably was sending out bad signals when it malfunctioned and sent a clipped signal, thus blowing the subs. He says sorry and then tells me I need to take to the deck to a service center to get it serviced since he isn't an Alpine dealer, I bought the deck, new, off of ebay. I was now thinking oh great I have to buy new subs and pay for repairs since I didn't buy the deck from a dealer. I take the deck to an authorized dealer he looks at it and fiddles with it and says it needs to go out for servicing, I ask him how much it will cost me to fix he said around 100 bucks or so. I was like thats not too bad, but still I think a warranty should cover it. I tell the guy at the dealer, about what the other stereo shop told me about he subwoofer problem and how the deck probably messed them up and he seemed pretty firmly convinced against the idea, so I got hopeful, thinking maybe its just something with the preouts or bass engine etc in the deck. The guy at the Alpine dealer pulls the deck out and tells me it should take 2 weeks tops. 2 weeks rolls around and no deck after a few phone calls every couple days I finally am told they have a deck for me, 3 weeks later. They said they were waiting on parts to fix my deck and to speed things up they just had Alpine send up a new (refurbished) one up. I go in to get my deck, the dealer puts it in and I ask how much I owe and they tell me it's covered under warranty. So I was happy Alpine warranteed it and that the dealer expedited the deck repair/replacement, but I STILL HAVE NO BASS. The subs are not working. So here is the thing I KNOW for a fact my subs were working perfectly fine before the deck faulted, but then after the whole thing they did not work. I want to know if I should press Alpine or the Alpine dealer to replace/reimburse me for the subs because the deck is the only cause for the subwoofers demise. What should I do? Go into the dealer and press this issue? or Raise hell with Alpine over the phone? or am I screwed and have to take the loss and replace the subs??? Thank you for any comments. Tom -- Indiglow ------------------------------------------------------------------------ CarAudioForum.com - Usenet Gateway w/over one million posts online! View this thread: http://www.caraudioforum.com/vbb2/sh...hreadid=153591 |
#2
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Alpine deck blew my subs!
Okay so I was having problems with my Alpine CDA 7878 deck over two
weeks ago. On that day it was playing just fine at a low volume level and then all of sudden some funny gobbledy goo sounds came out of the speakers, followed by the message "ERROR" and the CD player not working and not ejecting. The deck's radio still worked and I notice I was getting NO BASS.. hmm strange I thought. So I take it in to the shop that installed it, he says the deck is busted and that the reason I have no bass is because the subs are blown or something is wrong with them. How do you know the subs are blown? Usually when you blow a woofer, it still plays - albeit not well. I was like wtf how could I have blown them, I wasn't playing them loud AT ALL, I wasn't really even listening to music when the whole thing happened. He says the deck probably was sending out bad signals when it malfunctioned and sent a clipped signal, thus blowing the subs. I call bull**** on his part. Though it's possible, either the subs were junk or the amps were friggin huge. One of those MUST be true in order for the deck to cause the subs to blow. He says sorry and then tells me I need to take to the deck to a service center to get it serviced since he isn't an Alpine dealer, I bought the deck, new, off of ebay. I was now thinking oh great I have to buy new subs and pay for repairs since I didn't buy the deck from a dealer. I take the deck to an authorized dealer he looks at it and fiddles with it and says it needs to go out for servicing, I ask him how much it will cost me to fix he said around 100 bucks or so. I was like thats not too bad, but still I think a warranty should cover it. I tell the guy at the dealer, about what the other stereo shop told me about he subwoofer problem and how the deck probably messed them up and he seemed pretty firmly convinced against the idea, so I got hopeful, thinking maybe its just something with the preouts or bass engine etc in the deck. The guy at the Alpine dealer pulls the deck out and tells me it should take 2 weeks tops. 2 weeks rolls around and no deck after a few phone calls every couple days I finally am told they have a deck for me, 3 weeks later. They said they were waiting on parts to fix my deck and to speed things up they just had Alpine send up a new (refurbished) one up. I go in to get my deck, the dealer puts it in and I ask how much I owe and they tell me it's covered under warranty. So I was happy Alpine warranteed it and that the dealer expedited the deck repair/replacement, but I STILL HAVE NO BASS. The subs are not working. So here is the thing I KNOW for a fact my subs were working perfectly fine before the deck faulted, but then after the whole thing they did not work. I want to know if I should press Alpine or the Alpine dealer to replace/reimburse me for the subs because the deck is the only cause for the subwoofers demise. What should I do? Go into the dealer and press this issue? or Raise hell with Alpine over the phone? or am I screwed and have to take the loss and replace the subs??? Take the subwoofer box, bring it into the house, and hook it up to your radio (don't crank it - your home stereo may not like it at high volumes). $10 says the subs work. |
#3
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Alpine deck blew my subs!
I agree with Mark.
Make sure your subs are wired for an impedence load the head unit can handle. When you wire up a 2 ohm speaker load to an amp bridged mono, the amp "sees" a 1 ohm load. Furthermore, a 4 ohm speaker load to an amp bridged mono, the amp will really "see" 2 ohms. If this is the scenario make sure the amp can handle lower impedence loads. Garrett Mark Zarella wrote: Okay so I was having problems with my Alpine CDA 7878 deck over two weeks ago. On that day it was playing just fine at a low volume level and then all of sudden some funny gobbledy goo sounds came out of the speakers, followed by the message "ERROR" and the CD player not working and not ejecting. The deck's radio still worked and I notice I was getting NO BASS.. hmm strange I thought. So I take it in to the shop that installed it, he says the deck is busted and that the reason I have no bass is because the subs are blown or something is wrong with them. How do you know the subs are blown? Usually when you blow a woofer, it still plays - albeit not well. I was like wtf how could I have blown them, I wasn't playing them loud AT ALL, I wasn't really even listening to music when the whole thing happened. He says the deck probably was sending out bad signals when it malfunctioned and sent a clipped signal, thus blowing the subs. I call bull**** on his part. Though it's possible, either the subs were junk or the amps were friggin huge. One of those MUST be true in order for the deck to cause the subs to blow. He says sorry and then tells me I need to take to the deck to a service center to get it serviced since he isn't an Alpine dealer, I bought the deck, new, off of ebay. I was now thinking oh great I have to buy new subs and pay for repairs since I didn't buy the deck from a dealer. I take the deck to an authorized dealer he looks at it and fiddles with it and says it needs to go out for servicing, I ask him how much it will cost me to fix he said around 100 bucks or so. I was like thats not too bad, but still I think a warranty should cover it. I tell the guy at the dealer, about what the other stereo shop told me about he subwoofer problem and how the deck probably messed them up and he seemed pretty firmly convinced against the idea, so I got hopeful, thinking maybe its just something with the preouts or bass engine etc in the deck. The guy at the Alpine dealer pulls the deck out and tells me it should take 2 weeks tops. 2 weeks rolls around and no deck after a few phone calls every couple days I finally am told they have a deck for me, 3 weeks later. They said they were waiting on parts to fix my deck and to speed things up they just had Alpine send up a new (refurbished) one up. I go in to get my deck, the dealer puts it in and I ask how much I owe and they tell me it's covered under warranty. So I was happy Alpine warranteed it and that the dealer expedited the deck repair/replacement, but I STILL HAVE NO BASS. The subs are not working. So here is the thing I KNOW for a fact my subs were working perfectly fine before the deck faulted, but then after the whole thing they did not work. I want to know if I should press Alpine or the Alpine dealer to replace/reimburse me for the subs because the deck is the only cause for the subwoofers demise. What should I do? Go into the dealer and press this issue? or Raise hell with Alpine over the phone? or am I screwed and have to take the loss and replace the subs??? Take the subwoofer box, bring it into the house, and hook it up to your radio (don't crank it - your home stereo may not like it at high volumes). $10 says the subs work. |
#4
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Alpine deck blew my subs!
Reading through the plies, I've yet to see anything about the amp the
subs are connected to. Whats the dilly with that? Brandonb Sanitarium wrote: I agree with Mark. Make sure your subs are wired for an impedence load the head unit can handle. When you wire up a 2 ohm speaker load to an amp bridged mono, the amp "sees" a 1 ohm load. Furthermore, a 4 ohm speaker load to an amp bridged mono, the amp will really "see" 2 ohms. If this is the scenario make sure the amp can handle lower impedence loads. Garrett Mark Zarella wrote: Okay so I was having problems with my Alpine CDA 7878 deck over two weeks ago. On that day it was playing just fine at a low volume level and then all of sudden some funny gobbledy goo sounds came out of the speakers, followed by the message "ERROR" and the CD player not working and not ejecting. The deck's radio still worked and I notice I was getting NO BASS.. hmm strange I thought. So I take it in to the shop that installed it, he says the deck is busted and that the reason I have no bass is because the subs are blown or something is wrong with them. How do you know the subs are blown? Usually when you blow a woofer, it still plays - albeit not well. I was like wtf how could I have blown them, I wasn't playing them loud AT ALL, I wasn't really even listening to music when the whole thing happened. He says the deck probably was sending out bad signals when it malfunctioned and sent a clipped signal, thus blowing the subs. I call bull**** on his part. Though it's possible, either the subs were junk or the amps were friggin huge. One of those MUST be true in order for the deck to cause the subs to blow. He says sorry and then tells me I need to take to the deck to a service center to get it serviced since he isn't an Alpine dealer, I bought the deck, new, off of ebay. I was now thinking oh great I have to buy new subs and pay for repairs since I didn't buy the deck from a dealer. I take the deck to an authorized dealer he looks at it and fiddles with it and says it needs to go out for servicing, I ask him how much it will cost me to fix he said around 100 bucks or so. I was like thats not too bad, but still I think a warranty should cover it. I tell the guy at the dealer, about what the other stereo shop told me about he subwoofer problem and how the deck probably messed them up and he seemed pretty firmly convinced against the idea, so I got hopeful, thinking maybe its just something with the preouts or bass engine etc in the deck. The guy at the Alpine dealer pulls the deck out and tells me it should take 2 weeks tops. 2 weeks rolls around and no deck after a few phone calls every couple days I finally am told they have a deck for me, 3 weeks later. They said they were waiting on parts to fix my deck and to speed things up they just had Alpine send up a new (refurbished) one up. I go in to get my deck, the dealer puts it in and I ask how much I owe and they tell me it's covered under warranty. So I was happy Alpine warranteed it and that the dealer expedited the deck repair/replacement, but I STILL HAVE NO BASS. The subs are not working. So here is the thing I KNOW for a fact my subs were working perfectly fine before the deck faulted, but then after the whole thing they did not work. I want to know if I should press Alpine or the Alpine dealer to replace/reimburse me for the subs because the deck is the only cause for the subwoofers demise. What should I do? Go into the dealer and press this issue? or Raise hell with Alpine over the phone? or am I screwed and have to take the loss and replace the subs??? Take the subwoofer box, bring it into the house, and hook it up to your radio (don't crank it - your home stereo may not like it at high volumes). $10 says the subs work. |
#5
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Alpine deck blew my subs!
I assume hes trying to power subs with the head unit built in amp....
???? Brandon Buckner wrote: Reading through the plies, I've yet to see anything about the amp the subs are connected to. Whats the dilly with that? Brandonb Sanitarium wrote: I agree with Mark. Make sure your subs are wired for an impedence load the head unit can handle. When you wire up a 2 ohm speaker load to an amp bridged mono, the amp "sees" a 1 ohm load. Furthermore, a 4 ohm speaker load to an amp bridged mono, the amp will really "see" 2 ohms. If this is the scenario make sure the amp can handle lower impedence loads. Garrett Mark Zarella wrote: Okay so I was having problems with my Alpine CDA 7878 deck over two weeks ago. On that day it was playing just fine at a low volume level and then all of sudden some funny gobbledy goo sounds came out of the speakers, followed by the message "ERROR" and the CD player not working and not ejecting. The deck's radio still worked and I notice I was getting NO BASS.. hmm strange I thought. So I take it in to the shop that installed it, he says the deck is busted and that the reason I have no bass is because the subs are blown or something is wrong with them. How do you know the subs are blown? Usually when you blow a woofer, it still plays - albeit not well. I was like wtf how could I have blown them, I wasn't playing them loud AT ALL, I wasn't really even listening to music when the whole thing happened. He says the deck probably was sending out bad signals when it malfunctioned and sent a clipped signal, thus blowing the subs. I call bull**** on his part. Though it's possible, either the subs were junk or the amps were friggin huge. One of those MUST be true in order for the deck to cause the subs to blow. He says sorry and then tells me I need to take to the deck to a service center to get it serviced since he isn't an Alpine dealer, I bought the deck, new, off of ebay. I was now thinking oh great I have to buy new subs and pay for repairs since I didn't buy the deck from a dealer. I take the deck to an authorized dealer he looks at it and fiddles with it and says it needs to go out for servicing, I ask him how much it will cost me to fix he said around 100 bucks or so. I was like thats not too bad, but still I think a warranty should cover it. I tell the guy at the dealer, about what the other stereo shop told me about he subwoofer problem and how the deck probably messed them up and he seemed pretty firmly convinced against the idea, so I got hopeful, thinking maybe its just something with the preouts or bass engine etc in the deck. The guy at the Alpine dealer pulls the deck out and tells me it should take 2 weeks tops. 2 weeks rolls around and no deck after a few phone calls every couple days I finally am told they have a deck for me, 3 weeks later. They said they were waiting on parts to fix my deck and to speed things up they just had Alpine send up a new (refurbished) one up. I go in to get my deck, the dealer puts it in and I ask how much I owe and they tell me it's covered under warranty. So I was happy Alpine warranteed it and that the dealer expedited the deck repair/replacement, but I STILL HAVE NO BASS. The subs are not working. So here is the thing I KNOW for a fact my subs were working perfectly fine before the deck faulted, but then after the whole thing they did not work. I want to know if I should press Alpine or the Alpine dealer to replace/reimburse me for the subs because the deck is the only cause for the subwoofers demise. What should I do? Go into the dealer and press this issue? or Raise hell with Alpine over the phone? or am I screwed and have to take the loss and replace the subs??? Take the subwoofer box, bring it into the house, and hook it up to your radio (don't crank it - your home stereo may not like it at high volumes). $10 says the subs work. |
#6
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Alpine deck blew my subs!
Eeww... thats just.. gross.
Brandonb Sanitarium wrote: I assume hes trying to power subs with the head unit built in amp.... ???? Brandon Buckner wrote: Reading through the plies, I've yet to see anything about the amp the subs are connected to. Whats the dilly with that? Brandonb Sanitarium wrote: I agree with Mark. Make sure your subs are wired for an impedence load the head unit can handle. When you wire up a 2 ohm speaker load to an amp bridged mono, the amp "sees" a 1 ohm load. Furthermore, a 4 ohm speaker load to an amp bridged mono, the amp will really "see" 2 ohms. If this is the scenario make sure the amp can handle lower impedence loads. Garrett Mark Zarella wrote: Okay so I was having problems with my Alpine CDA 7878 deck over two weeks ago. On that day it was playing just fine at a low volume level and then all of sudden some funny gobbledy goo sounds came out of the speakers, followed by the message "ERROR" and the CD player not working and not ejecting. The deck's radio still worked and I notice I was getting NO BASS.. hmm strange I thought. So I take it in to the shop that installed it, he says the deck is busted and that the reason I have no bass is because the subs are blown or something is wrong with them. How do you know the subs are blown? Usually when you blow a woofer, it still plays - albeit not well. I was like wtf how could I have blown them, I wasn't playing them loud AT ALL, I wasn't really even listening to music when the whole thing happened. He says the deck probably was sending out bad signals when it malfunctioned and sent a clipped signal, thus blowing the subs. I call bull**** on his part. Though it's possible, either the subs were junk or the amps were friggin huge. One of those MUST be true in order for the deck to cause the subs to blow. He says sorry and then tells me I need to take to the deck to a service center to get it serviced since he isn't an Alpine dealer, I bought the deck, new, off of ebay. I was now thinking oh great I have to buy new subs and pay for repairs since I didn't buy the deck from a dealer. I take the deck to an authorized dealer he looks at it and fiddles with it and says it needs to go out for servicing, I ask him how much it will cost me to fix he said around 100 bucks or so. I was like thats not too bad, but still I think a warranty should cover it. I tell the guy at the dealer, about what the other stereo shop told me about he subwoofer problem and how the deck probably messed them up and he seemed pretty firmly convinced against the idea, so I got hopeful, thinking maybe its just something with the preouts or bass engine etc in the deck. The guy at the Alpine dealer pulls the deck out and tells me it should take 2 weeks tops. 2 weeks rolls around and no deck after a few phone calls every couple days I finally am told they have a deck for me, 3 weeks later. They said they were waiting on parts to fix my deck and to speed things up they just had Alpine send up a new (refurbished) one up. I go in to get my deck, the dealer puts it in and I ask how much I owe and they tell me it's covered under warranty. So I was happy Alpine warranteed it and that the dealer expedited the deck repair/replacement, but I STILL HAVE NO BASS. The subs are not working. So here is the thing I KNOW for a fact my subs were working perfectly fine before the deck faulted, but then after the whole thing they did not work. I want to know if I should press Alpine or the Alpine dealer to replace/reimburse me for the subs because the deck is the only cause for the subwoofers demise. What should I do? Go into the dealer and press this issue? or Raise hell with Alpine over the phone? or am I screwed and have to take the loss and replace the subs??? Take the subwoofer box, bring it into the house, and hook it up to your radio (don't crank it - your home stereo may not like it at high volumes). $10 says the subs work. |
#7
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Alpine deck blew my subs!
"Sanitarium" wrote in message ... | I agree with Mark. | | Make sure your subs are wired for an impedence load the head unit can | handle. | When you wire up a 2 ohm speaker load to an amp bridged mono, the amp | "sees" a 1 ohm load. Furthermore, a 4 ohm speaker load to an amp | bridged mono, the amp will really "see" 2 ohms. If this is the scenario | make sure the amp can handle lower impedence loads. | | Garrett | snip Can you 'splain this to me? A load is a load. If'n yer puttin' 2 ohm load (2 -4's wired in parallel), the amp sees 2 ohms. If yer puttin a single 4-ohm speaker (sub), the amp "sees" 4 ohms...because that's what the load is. Or am I missing something? |
#8
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Alpine deck blew my subs!
Gary Rodgers wrote
"Sanitarium" wrote in message ... | I agree with Mark. | | Make sure your subs are wired for an impedence load the head unit can | handle. If the subs are running off of an external amp, what difference will the way they are wired to the amp make as far as the head unit is concerned? | When you wire up a 2 ohm speaker load to an amp bridged mono, the amp | "sees" a 1 ohm load. No it doesn't. | Furthermore, a 4 ohm speaker load to an amp | bridged mono, the amp will really "see" 2 ohms. No it won't. | If this is the scenario | make sure the amp can handle lower impedence loads. | | Garrett | snip Can you 'splain this to me? A load is a load. If'n yer puttin' 2 ohm load (2 -4's wired in parallel), the amp sees 2 ohms. If yer puttin a single 4-ohm speaker (sub), the amp "sees" 4 ohms...because that's what the load is. Or am I missing something? You aren't missing something ... Sanatarium is. He misunderstands the theory behind bridging an amp. For a given amp the following is true : Amp "A" is rated for 50W x 2 @ 4ohms, 100W x 2 @ 2ohms (minimum impedance) when you bridge the amp, 195W x 1 @ 4ohm (minimum impedance) notice that when you bridge the amp the minimum impedance is higher. Bottom line is, if you wired a pair of 4ohm speakers in parallel and then run the amp bridge you will have a 2ohm load which the amp is not rated to handle. In this example, you have 3 obvious options : 1) speakers in parallel running off 1 side of the amp (amp not bridged) results in 100W @ 2ohms giving each speaker 50W 2) speakers in stereo on their own channels (amp is in stereo) results in 50W x 2 @ 4ohms giving each speaker 50W 3) speakers in series amp bridged results in ~100W @ 8ohms giving each speaker 50W This is why some degree of planning is important when choosing an amp for the subs, or subs for an amp. Some would argue that running subs in stereo is a bad idea ... I don't have an opinion on it. It is mostly for illustration, but is very applicable for speaker systems that aren't subs. -- Regards, Dan Snooks |
#9
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Alpine deck blew my subs!
Hi guys... OK please correct me if I am wrong... but I thought the
output of the MOSFET transistors invert when the amp is bridged and this inversion creates the lower impedence load, when the amp is bridged. Hence, the output transistors are forced to pass double the current when bridged? ??? thanks, Garrett Daniel Snooks wrote: Gary Rodgers wrote "Sanitarium" wrote in message ... | I agree with Mark. | | Make sure your subs are wired for an impedence load the head unit can | handle. If the subs are running off of an external amp, what difference will the way they are wired to the amp make as far as the head unit is concerned? | When you wire up a 2 ohm speaker load to an amp bridged mono, the amp | "sees" a 1 ohm load. No it doesn't. | Furthermore, a 4 ohm speaker load to an amp | bridged mono, the amp will really "see" 2 ohms. No it won't. | If this is the scenario | make sure the amp can handle lower impedence loads. | | Garrett | snip Can you 'splain this to me? A load is a load. If'n yer puttin' 2 ohm load (2 -4's wired in parallel), the amp sees 2 ohms. If yer puttin a single 4-ohm speaker (sub), the amp "sees" 4 ohms...because that's what the load is. Or am I missing something? You aren't missing something ... Sanatarium is. He misunderstands the theory behind bridging an amp. For a given amp the following is true : Amp "A" is rated for 50W x 2 @ 4ohms, 100W x 2 @ 2ohms (minimum impedance) when you bridge the amp, 195W x 1 @ 4ohm (minimum impedance) notice that when you bridge the amp the minimum impedance is higher. Bottom line is, if you wired a pair of 4ohm speakers in parallel and then run the amp bridge you will have a 2ohm load which the amp is not rated to handle. In this example, you have 3 obvious options : 1) speakers in parallel running off 1 side of the amp (amp not bridged) results in 100W @ 2ohms giving each speaker 50W 2) speakers in stereo on their own channels (amp is in stereo) results in 50W x 2 @ 4ohms giving each speaker 50W 3) speakers in series amp bridged results in ~100W @ 8ohms giving each speaker 50W This is why some degree of planning is important when choosing an amp for the subs, or subs for an amp. Some would argue that running subs in stereo is a bad idea ... I don't have an opinion on it. It is mostly for illustration, but is very applicable for speaker systems that aren't subs. -- Regards, Dan Snooks |
#10
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Alpine deck blew my subs!
Hi guys... OK please correct me if I am wrong... but I thought the
output of the MOSFET transistors invert when the amp is bridged No. The inversion is in the preamp section. and this inversion creates the lower impedence load, There's nothing the amp can do to "create" the speaker's impedance - aside from melting the voice coil. The speaker has an impedance, period. when the amp is bridged. Hence, the output transistors are forced to pass double the current when bridged? They "double" the current (actually, not quite a doubling), but not because the speaker's impedance is magically halved. Rather, it's because the voltage is doubled. |
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