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#1
Posted to rec.audio.car
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Noob Ohm Issue 2 vs 8
I just recently aquired a few components -an amp and 2 subs. I am not
very interested in SPL. I am very interested in SQ. Here is the amp that I have: CrunchPZi 175.4 -1000 Watt (peak) 4 Channel Amplifier and the specs for this amp: 1000W 2 / 3 / 4-Channel A/B Class Amplifier 175W x 4-Ch @ 4-Ohms or 250W x 4-Ch @ 2-Ohms or 500W x 2-Ch @ 4-Ohms Dynamic Music Watts I have (2) of these subs: Pioneer TS-W256DVC10" Dual Voice Coil Component Subwoofer and the specs: 10" Component Subwoofers with 800 Watts Max. Power 350 Watts Nominal Power 4-Ohm Dual Voice Coil (DVC) Recommended Enclosure Use: 0.65 ~ 1.25 Cubic Feet My intentions are to run this amp in (2) channel mode - (1) channel for each sub. My question is this: Since these are dual voice coil speakers, should I wire them as 2ohm or wire them as 8ohm? I don't care to play my music extremely loud - I just want some dynamics, clarity and quality! I am really hoping someone can make me feel better about this mess. I sure get myself into some predicaments. bob z. |
#2
Posted to rec.audio.car
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Noob Ohm Issue 2 vs 8
On Oct 12, 9:04 am, "bob zee" wrote:
Here is the amp that I have: CrunchPZi 175.4 -1000 Watt (peak) 4 Channel Amplifier and the specs for this amp: 1000W 2 / 3 / 4-Channel A/B Class Amplifier 175W x 4-Ch @ 4-Ohms or 250W x 4-Ch @ 2-Ohms or 500W x 2-Ch @ 4-Ohms Dynamic Music Watts I don't know what a "Dynamic Music Watt" is. My intentions are to run this amp in (2) channel mode - (1) channel for each sub. My question is this: Since these are dual voice coil speakers, should I wire them as 2ohm or wire them as 8ohm? I don't care to play my music extremely loud - I just want some dynamics, clarity and quality! It doesn't look like you can take your 4-channel amp and run it in 2-channel (bridged) mode on a 4 Ohm load. You'll need to wire the individual coils in series. See "1 DVC driver with Voice Coils in Series" at http://mobile.jlaudio.com/support_pages.php?page_id=161 and do that twice. -dan |
#3
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Noob Ohm Issue 2 vs 8
D.Kreft wrote: 500W x 2-Ch @ 4-Ohms Dynamic Music Watts I don't know what a "Dynamic Music Watt" is. I don't either! Sure sounds cool, though, doesn't it? :~) It doesn't look like you can take your 4-channel amp and run it in 2-channel (bridged) mode on a 4 Ohm load. You'll need to wire the individual coils in series. See "1 DVC driver with Voice Coils in Series" at http://mobile.jlaudio.com/support_pages.php?page_id=161 and do that twice. -dan Then to keep it simple I am going to assume (1) channel and (1) sub like in the picture. My amp will then be pushing a sub with an 8 Ohm load. Is this correct? This will not be any cause for me to worry, I hope. Thanks! bob z. |
#4
Posted to rec.audio.car
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Noob Ohm Issue 2 vs 8
bob zee wrote:
Then to keep it simple I am going to assume (1) channel and (1) sub like in the picture. My amp will then be pushing a sub with an 8 Ohm load. Is this correct? Just to be *crystal* clear... 0. You have a four-channel amp--we'll call those channels A, B, C, and D. 1. Bridge A + B together to make channel "AB". Bridge C + D together to make channel "CD". You now effectively have a "two-channel" amp. 2. Wire the VC on one driver in series per the diagram to which I pointed you. Do the same with the other driver. You now effectively have two 8 Ohm drivers. 3. Take one 8 Ohm driver and hook it up to channel AB. Take the other driver and hook it up to channel CD. You now have a two-channel amp powering two 8 Ohm speakers. 4. Relax. -dan |
#5
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Noob Ohm Issue 2 vs 8
D.Kreft wrote: Just to be *crystal* clear... 4. Relax. -dan Thanks a ton. You rock. bob z. |
#6
Posted to rec.audio.car
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Noob Ohm Issue 2 vs 8
D.Kreft wrote:
On Oct 12, 9:04 am, "bob zee" wrote: Here is the amp that I have: CrunchPZi 175.4 -1000 Watt (peak) 4 Channel Amplifier and the specs for this amp: 1000W 2 / 3 / 4-Channel A/B Class Amplifier 175W x 4-Ch @ 4-Ohms or 250W x 4-Ch @ 2-Ohms or 500W x 2-Ch @ 4-Ohms Dynamic Music Watts I don't know what a "Dynamic Music Watt" is. I would guess it's Crunch's non-technical term for "RMS". |
#7
Posted to rec.audio.car
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Noob Ohm Issue 2 vs 8
bob zee wrote:
I just recently aquired a few components -an amp and 2 subs. I am not very interested in SPL. I am very interested in SQ. Here is the amp that I have: CrunchPZi 175.4 -1000 Watt (peak) 4 Channel Amplifier and the specs for this amp: 1000W 2 / 3 / 4-Channel A/B Class Amplifier 175W x 4-Ch @ 4-Ohms or 250W x 4-Ch @ 2-Ohms or 500W x 2-Ch @ 4-Ohms Dynamic Music Watts I have (2) of these subs: Pioneer TS-W256DVC10" Dual Voice Coil Component Subwoofer and the specs: 10" Component Subwoofers with 800 Watts Max. Power 350 Watts Nominal Power 4-Ohm Dual Voice Coil (DVC) Recommended Enclosure Use: 0.65 ~ 1.25 Cubic Feet My intentions are to run this amp in (2) channel mode - (1) channel for each sub. My question is this: Since these are dual voice coil speakers, should I wire them as 2ohm or wire them as 8ohm? I don't care to play my music extremely loud - I just want some dynamics, clarity and quality! I am really hoping someone can make me feel better about this mess. I sure get myself into some predicaments. From the specs you listed, it doesn't look like that amp will like a two-ohm load running in two-channel mode, so you'll pretty much have to go with the eight-ohm configuration. |
#8
Posted to rec.audio.car
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Noob Ohm Issue 2 vs 8
Matt Ion wrote: From the specs you listed, it doesn't look like that amp will like a two-ohm load running in two-channel mode, so you'll pretty much have to go with the eight-ohm configuration. That is what I figured. I was really just looking for some confirmation. What will 8ohm do to my SQ or am I worrying for no reason? Thanks! bob z. |
#9
Posted to rec.audio.car
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Noob Ohm Issue 2 vs 8
It will cut your power output in half. Seeing the wattage that you have listed
for this amp is in "Peak Power" you should get around 50 - 60 watts RMS per coil cranked up. As for your SQ, I have always found that under powering a sub sounds like a wet fart and I have also found this to be even more true when using lite duty amps such as Crunch. My advice is to try it out for yourself and see how you like it. In article .com, "bob zee" wrote: That is what I figured. I was really just looking for some confirmation. What will 8ohm do to my SQ or am I worrying for no reason? Thanks! bob z. |
#10
Posted to rec.audio.car
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Noob Ohm Issue 2 vs 8
Captain_Howdy wrote:
It will cut your power output in half. Seeing the wattage that you have listed for this amp is in "Peak Power" you should get around 50 - 60 watts RMS per coil cranked up. As for your SQ, I have always found that under powering a sub sounds like a wet fart and I have also found this to be even more true when using lite duty amps such as Crunch. My advice is to try it out for yourself and see how you like it. In article .com, "bob zee" wrote: That is what I figured. I was really just looking for some confirmation. What will 8ohm do to my SQ or am I worrying for no reason? One other option would be to run each pair of channels in mono rather than bridged mode, then wire each coil individually to each channel, but that really won't give you any more power, and can be tricky when setting levels properly to match. Frankly, you'll get more output and possibly cleaner sound by wiring the subs for two ohms (coils in parallel) and simply running them off two of the four channels without bridging. The other two channels are left unused... or use them for a pair of your full-range speakers, if you don't already have an amp for those. |
#11
Posted to rec.audio.car
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Noob Ohm Issue 2 vs 8
Captain_Howdy wrote: It will cut your power output in half. Seeing the wattage that you have listed for this amp is in "Peak Power" you should get around 50 - 60 watts RMS per coil cranked up. As for your SQ, I have always found that under powering a sub sounds like a wet fart and I have also found this to be even more true when using lite duty amps such as Crunch. My advice is to try it out for yourself and see how you like it. I figured this was a light-duty amp considering the cost. I am on a budget, so this is what I could afford. Depending on how this setup sounds, I can see myself transferring this amp to the other car - a car that has 4 speakers that will utilize all 4 channels of this amp. I really appreciate your advice. I was a little afraid to ask what wattage would end up at each coil. I didn't want it to sound like I was just in it for the big numbers. I really like a nice tight, clean, punchy sound in my music. There I go... starting to worry again. Must relax, must relax, must relax. :~) Thanks! bob z. |
#12
Posted to rec.audio.car
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Noob Ohm Issue 2 vs 8
bob zee wrote:
That is what I figured. I was really just looking for some confirmation. What will 8ohm do to my SQ or am I worrying for no reason? Bob, take a deep breath. Use the force. Go to your happy place. Relax. Cross each bridge as you come to them--don't try to get it perfect the first time around because, well, quite frankly it sounds like this might be your first "go" at system building and it might not sound perfect the first time around. Even systems setup by experts typically need tweaking and tuning to get them to sound just right...and sometimes even that doesn't work. Just have fun with it. Follow carefully the instructions I've given you thus far, follow the wiring diagrams, and check everything you do two or three times. Modern amplifiers have lots of protection circuits in them to keep you from doing something obcenely stupid and destroying your amplifier. That's not to say you can be careless, only that you don't have to sweat bullets here--it's all just a matter of "putting tab A into slot B", tightening some screws and vacuuming-up after yourself when you're done. Running in 8 Ohms mono is effectively the same as running in 4 Ohms stereo. While you won't get the absolute most power out of your amplifier, you will definitely run cooler, you'll usually have greater dynamic headroom and the damping factor will be higher. In short, sound quality can actually be *better* with a higher load than with a lower load. If you find that the subs aren't quite loud enough to keep up with the rest of your system (or with your expectations), THEN you can fall back to using just half of your amp bridged on a 4 Ohm load...which will be louder but *might* not sound as good--it's all very subjective and ultimately only you are going to be able to tell if it "sounds good" or not. We're just a bunch of talking heads and it's not our ears in your car. -dan |
#13
Posted to rec.audio.car
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Noob Ohm Issue 2 vs 8
D.Kreft wrote: Bob, take a deep breath. Use the force. Go to your happy place. Relax. Cross each bridge as you come to them--don't try to get it perfect the first time around because, well, quite frankly it sounds like this might be your first "go" at system building and it might not sound perfect the first time around. -dan Definitely my first real "go" at system building. Thank you for the positive encouragement. I'll be in the garage this weekend cuttin, strippin, and crimpin... :~) Thanks so much bob z. |
#14
Posted to rec.audio.car
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Noob Ohm Issue 2 vs 8
D.Kreft wrote:
Cross each bridge as you come to them--don't try to get it perfect the first time around because, well, quite frankly it sounds like this might be your first "go" at system building and it might not sound perfect the first time around. Even systems setup by experts typically need tweaking and tuning to get them to sound just right...and sometimes even that doesn't work. Just have fun with it. What he said! No matter what you do, Bob, it should be an improvement over NO subs, so you really can't go wrong at this point |
#15
Posted to rec.audio.car
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Noob Ohm Issue 2 vs 8
Matt Ion wrote: What he said! No matter what you do, Bob, it should be an improvement over NO subs, so you really can't go wrong at this point Heck yeah. I have a 90 minute drive to work (same back home) and my stock stereo is beginning to clip (?) and cut-out sooner and sooner everyday. I thought it was overheating, but it was 34° this morning. I normally keep the volume at about 75% of full for my whole drive. Today, I could obtain no more than 15 minutes of 75% and then it would only 'clear up' at 50% volume. bob z. (2003 honda accord 2-door - stock 160w stereo) |
#16
Posted to rec.audio.car
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Noob Ohm Issue 2 vs 8
bob zee wrote:
I just recently aquired a few components -an amp and 2 subs. I am not very interested in SPL. I am very interested in SQ. Here is the amp that I have: CrunchPZi 175.4 -1000 Watt (peak) 4 Channel Amplifier and the specs for this amp: 1000W 2 / 3 / 4-Channel A/B Class Amplifier 175W x 4-Ch @ 4-Ohms or 250W x 4-Ch @ 2-Ohms or 500W x 2-Ch @ 4-Ohms Dynamic Music Watts bob z. You didn't list the specs for 3-Ch mode.. I'd run 3-Ch mode. If available... I'd wire each sub for 8-Ohms Hook both up to the bridged channel for a 4-Ohm load. Use the 2 stereo channels for the front speakers. FasDeth |
#17
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Noob Ohm Issue 2 vs 8
FasDeth wrote: You didn't list the specs for 3-Ch mode.. I'd run 3-Ch mode. If available... I'd wire each sub for 8-Ohms Hook both up to the bridged channel for a 4-Ohm load. Use the 2 stereo channels for the front speakers. FasDeth I can't find the specs for the 3-Channel mode. Crunch doesn't want us to know this info! :-( Good idea, though. I just don't have decent speakers up front yet. My system will be lop-sided for a little while. bob z. |
#18
Posted to rec.audio.car
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Noob Ohm Issue 2 vs 8
bob zee wrote:
FasDeth wrote: You didn't list the specs for 3-Ch mode.. I'd run 3-Ch mode. If available... I'd wire each sub for 8-Ohms Hook both up to the bridged channel for a 4-Ohm load. Use the 2 stereo channels for the front speakers. FasDeth I can't find the specs for the 3-Channel mode. Crunch doesn't want us to know this info! :-( Good idea, though. I just don't have decent speakers up front yet. My system will be lop-sided for a little while. Three-channel just means one pair of channels runs bridged, the other pair doesn't, so you'd get 500W @ 4 ohms for the bridged pair (as per your listed specs: 175W x 4-Ch @ 4-Ohms or 250W x 4-Ch @ 2-Ohms or 500W x 2-Ch @ 4-Ohms Dynamic Music Watts Specs-wise, wiring the subs that way (500W output) wouldn't be much different than running them as two ohm, each on its own channel (at 250W each). There MAY be some performance differences depending on whether the amp handles two-ohm loads or bridged loads better, but probably nothing significant. |
#19
Posted to rec.audio.car
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Noob Ohm Issue 2 vs 8
FasDeth wrote:
bob zee wrote: CrunchPZi 175.4 -1000 Watt (peak) 4 Channel Amplifier and the specs for this amp: 1000W 2 / 3 / 4-Channel A/B Class Amplifier 175W x 4-Ch @ 4-Ohms or 250W x 4-Ch @ 2-Ohms or 500W x 2-Ch @ 4-Ohms Dynamic Music Watts You didn't list the specs for 3-Ch mode.. I'd think that the output for 3-channel mode would be easily derived from the stats he gave, namely: 175W x 2 (@ 4 Ohm) / 500W x 1 (@ 4 Ohm) Although I'm thinking that 175 might be a typo that should be "125" instead. The *actual* output may vary (I'm not familiar with Crunchy amps), but I think it's a pretty safe bet to say it'll be pretty darn close to what I'm throwing-out here. -dan |
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