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#1
Posted to rec.audio.car
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new headunit install
So it's time for a new h/u and I need some advice.
First; here's what I got now: 4x6 in dash 6.5 in front door panel 6.5 in rear seat panel 2 12" subs in back The current h/u is one pre-amp out going to a dash EQ that balances line-out (from one (stereo) channel to 2 channels) to a 2 channel amp for the subs and a 4 channel amp for the 4 door speakers. (The dash speakers are piggy-backed (don't know the technical term for it) with the front door speaker channel). What I'm thinking of doing now is replacing the h/u with another one pre-amp out as is currently. My question is can I wire the 4x6 dash speakers to the front, speaker level outputs of the h/u? I don't neccessarily need SQ there, just presence. Can I do that and still use the pre-amp out for the rest of the system? Hope you can undestand my description. Thanks, Eric G. |
#2
Posted to rec.audio.car
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new headunit install
"Ericfg" wrote in message oups.com... So it's time for a new h/u and I need some advice. First; here's what I got now: 4x6 in dash 6.5 in front door panel 6.5 in rear seat panel 2 12" subs in back The current h/u is one pre-amp out going to a dash EQ that balances line-out (from one (stereo) channel to 2 channels) to a 2 channel amp for the subs and a 4 channel amp for the 4 door speakers. (The dash speakers are piggy-backed (don't know the technical term for it) with the front door speaker channel). What I'm thinking of doing now is replacing the h/u with another one pre-amp out as is currently. My question is can I wire the 4x6 dash speakers to the front, speaker level outputs of the h/u? I don't neccessarily need SQ there, just presence. Can I do that and still use the pre-amp out for the rest of the system? Hope you can undestand my description. Thanks, Eric G. With most headunits the answer is yes. You can run your line-level outs as well as the speaker outs on the HU at the same time, no problem. I would recommend that you run ONLY 6.5" midbass drivers in the front doors. I assume the 6x4's have tweeters and it is not a good idea to have multiple sets of tweeters up front when they are spaced far apart. This tends to make your soundstage VERY diffused. But I would DEFINATELY continue to run 6.5" midbass drivers in the front doors as midbass upfront tends to be a problem for most systems. Perhaps there's even a way to configure the X-overs so that the front door speakers only handle the low midbass, and then have the 6x4's high-passed above that point. That would likely produce the best SQ (I know, you said you didn't care about SQ, I can't help giving advice anyway). MOSFET |
#3
Posted to rec.audio.car
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new headunit install
MOSFET wrote: With most headunits the answer is yes. You can run your line-level outs as well as the speaker outs on the HU at the same time, no problem. Hi MOS. Thanks! I would recommend that you run ONLY 6.5" midbass drivers in the front doors. As I recall (in my drunken, Friday night state) both 6.5 sets are "high-passed". I assume the 6x4's have tweeters Yeah. two-way. (or 3-way) and it is not a good idea to have multiple sets of tweeters up front when they are spaced far apart. This tends to make your soundstage VERY diffused. The front door 6.5 (two-way MBQs) are very low in the door. Firing at my ankles. But I would DEFINATELY continue to run 6.5" midbass drivers in the front doors as midbass upfront tends to be a problem for most systems. Perhaps there's even a way to configure the X-overs so that the front door speakers only handle the low midbass, and then have the 6x4's high-passed above that point. The 4, door speakers are low level passed. I forget where the x-over piont is... 200...500.. something like that. But all the way up 20k That would likely produce the best SQ (I know, you said you didn't care about SQ, I can't help giving advice anyway). I *do* want SQ. In my little world I got 2 high SQ subs in the back (Mmats/PPI), 4 HSQ mid range doors spkrs (MBQ/old RF) and then adding just a touch of 1k (low level) in the dash for presence/imaging. BTW, as an aside, how long can one expect a high quality amp to be "high quality"? MY PPI and old RF are mid-80s vintage. Does that stuff degrade with time (like my JVC h/u did)? MOSFET |
#4
Posted to rec.audio.car
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new headunit install
I'm not sure you fully grasped what I was saying in my last post. Of course
your front 6.5" front door speakers are high-passed (so they don't handle the very low bass that your 2 12" subs produce). What I was saying is that you MIGHT want to consider ALSO putting low-pass filters on those speakers as well (this is called a band-pass filter because sound is then produced only in a narrow pass band). This way, those speakers (the 6.5" front door speakers would only handle frequncies between, let's just say, 80Hz and 300Hz). At 300 Hz, your 6x4" speakers would play everything above that point. This would essentially give you a three-way speaker system up front. IMHO, this would produce THE BEST SQ, imaging, soundstage depth, and all that. Anytime you have different speakers up front trying to play the SAME frequencies you run into trouble. Beyond problems invovling imaging and soundstage depth, the more serious problems involve cancellation effects. When two different kinds of speakers (6.5" vs. 6x4"), even if made by the same manufacturer, try to play the same frequencies there WILL be cancellation (and strange boosts) at certain frequencies. This can be avoided by making sure that they do not have to play the same frequency range. That was what I was sugesting in my previous post. MOSFET "Ericfg" wrote in message oups.com... MOSFET wrote: With most headunits the answer is yes. You can run your line-level outs as well as the speaker outs on the HU at the same time, no problem. Hi MOS. Thanks! I would recommend that you run ONLY 6.5" midbass drivers in the front doors. As I recall (in my drunken, Friday night state) both 6.5 sets are "high-passed". I assume the 6x4's have tweeters Yeah. two-way. (or 3-way) and it is not a good idea to have multiple sets of tweeters up front when they are spaced far apart. This tends to make your soundstage VERY diffused. The front door 6.5 (two-way MBQs) are very low in the door. Firing at my ankles. But I would DEFINATELY continue to run 6.5" midbass drivers in the front doors as midbass upfront tends to be a problem for most systems. Perhaps there's even a way to configure the X-overs so that the front door speakers only handle the low midbass, and then have the 6x4's high-passed above that point. The 4, door speakers are low level passed. I forget where the x-over piont is... 200...500.. something like that. But all the way up 20k That would likely produce the best SQ (I know, you said you didn't care about SQ, I can't help giving advice anyway). I *do* want SQ. In my little world I got 2 high SQ subs in the back (Mmats/PPI), 4 HSQ mid range doors spkrs (MBQ/old RF) and then adding just a touch of 1k (low level) in the dash for presence/imaging. BTW, as an aside, how long can one expect a high quality amp to be "high quality"? MY PPI and old RF are mid-80s vintage. Does that stuff degrade with time (like my JVC h/u did)? MOSFET |
#5
Posted to rec.audio.car
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new headunit install
MOSFET wrote: I'm not sure you fully grasped what I was saying in my last post. I did misunderstand. Sorry. Of course your front 6.5" front door speakers are high-passed (so they don't handle the very low bass that your 2 12" subs produce). What I was saying is that you MIGHT want to consider ALSO putting low-pass filters on those speakers as well I happen to have a PPI elec crossover (Sedona XO-3) that has a "mid-out" option (and a "tweet-out"). Would that work? Alternatively what is another option? Anytime you have different speakers up front trying to play the SAME frequencies you run into trouble. Beyond problems invovling imaging and soundstage depth, the more serious problems involve cancellation effects. When two different kinds of speakers (6.5" vs. 6x4"), even if made by the same manufacturer, try to play the same frequencies there WILL be cancellation (and strange boosts) at certain frequencies. That would explaine some harshness in the mid/high level. Good thing is I got a 10 band dash EQ to help. Thanks again, I appreciate you effort here Mr. MOSFET. |
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