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Old 23rd March 2004, 11:45 PM   #1
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Default 4 speakers, 2 channel amp, 1 crazy idea

alrighty ladies and gentlemen I have a crazy plan and I was hoping to get input from someone who actually knows what they are doing. I bought a cheap stereo and speakers for my wifes car and now i'm trying to patch it up with more cheapness. I have 4 good 6x9's I would like to install in her car and a 2 channel amp..it only says 300w max I'm assuming the RMS is probably half or at least hoping..so for all figures forthwith let us use the 150Wrms figure.

The head unit in the car doesn't put out enough wattage as of right now and I was wondering if it would be practical/possible to install the 4 speakers and wire them all into the 2 channel amp? Everything initially is 4 ohm I believe. I was thinking I could connect both left speakers to the left channel on the amp and both right speakers to the right...what are the implications of this? what sort of wattage/ohm issues do you forsee? The amp I have can be switched for high/full/low so I'm assuming I would need it to be kept at full...

someone let me know if i'm crazy or if this is a workable solution..

thanks!
dlv
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Old 24th March 2004, 06:16 AM   #2
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it`s a workable deal.if the amp is 2ohm stable.
and it work for awhile if it`s not.
or you can run them in series,keeping them 4ohm,2 left and 2 right.
to do them in series run the +of the amp to the+ on 1 speaker and the - of that speaker the + on the other speaker and the - of that speaker to the - on the amp.that is 1 chanel in series.
so the choice is yours.
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Old 24th March 2004, 06:51 AM   #3
sreten is offline sreten  United Kingdom
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ORB,
the series connection will give 8 ohms a side.

MG,

I assume the head is 4 channel ?

It is normal practise to run the the front two speakers off the
head, usually it can manage more power only driving two
channels. Usually the front speakers can't produce decent
bass.

Its then normal to place the rear 6x9's where they can produce
bass and drive them off the amplifier and set the amplifier to low.

After some setting up then the front/back control will control
the richness of the sound.

If the amp is 2 ohms stable 4 6x9's at the back is possible.

sreten.
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Old 24th March 2004, 12:37 PM   #4
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so you think it might be best for me to run the 2 front speakers off the head units amp (which is kinda quiet when running all 4 speakers and let the standalone amp push just the back speakers? How will I wire up the front 2 speakers to the head unit so they get essentially half of the wattage of the head unit to each channel? And then I would presumably connect the 2 rca pre-amp's to the amp and then just wire it to the 6x9's in standard fashion...i'm worried that the big amp on just 2 speakers might be overkill. I'm just looking for the cleanest power solution with what I have already..any wiring diagrams you could point me to would be great as well

thanks!
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Old 24th March 2004, 01:01 PM   #5
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well.. actually.. its not common to amp the fronts and run the rears off teh deck.. but that is normally with a sub... but if you amp the rears, you'll know the sound is coming from behind you, and its very annoying... if you amp the fronts, you won't be able to hear the rears.....

AMP THEM ALL!! lol
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Old 24th March 2004, 01:08 PM   #6
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ok..so when I amp them all how should I wire them? I'll be coming out from the 2 pre-amps (which i assume is basically a "line-out" for all frequencies correct). Then how should I wire the 6x9's? Obviously I want to put both the left speakers on one channel and both the right on the other...perhaps I should get one of those high pass filters for the front speakers from radio shack? xover @ about 200hz? helps me make the most of this sorry stereo system! What will the specs be as well? assuming it's 150w will I be getting 37.5Wrms per channel? I believe I read somewhere that when you run speakers together is ends up halving the wattage again which would leave me with only about 18w/channel which would be undesirable..thanks for the input thus far!

thanks!
dlv
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Old 24th March 2004, 02:05 PM   #7
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find out if the amp is stable into 2 ohms per channel... or just go for it anyway.... who cares... lol

and 18watts is still alot more than the headunit would give
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Old 24th March 2004, 02:13 PM   #8
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sreten,your right sorry about that it was about 1am and i wasn`t will the clearest of heads.
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Old 24th March 2004, 02:23 PM   #9
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Quote:
Originally posted by offroadbum
sreten,your right sorry about that it was about 1am and i wasn`t will the clearest of heads.

excuses excuses... its nearly 2am here and I'm not blaming that for my terrible spelling typing punctuation and stuff like that that you might have truble wif at sum stoopud our of da mornin.... its all natural my friend.. no sleep induced stupidity here.... what was this thread about?
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Old 24th March 2004, 03:33 PM   #10
maylar is offline maylar  United States
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Default Re: 4 speakers, 2 channel amp, 1 crazy idea

Quote:
Originally posted by muskgrave
The head unit in the car doesn't put out enough wattage as of right now and I was wondering if it would be practical/possible to install the 4 speakers and wire them all into the 2 channel amp? Everything initially is 4 ohm I believe.
You could try your idea and run all 4 if the amp is 2 ohm capable.

But if you want the best possible quality from the system, you should concentrate on the front speakers. Imaging and sound stage are compromised if you have the main speakers behind you. For that reason, most people amp the fronts and leave the rears on head unit power if you only have 2 channels of amp available.

Quote:
The amp I have can be switched for high/full/low so I'm assuming I would need it to be kept at full...
Normally we would hipass front speakers at 50-80 Hz and rely on subs to handle the low end. That lets you put as much power into the front speakers as possible without "clicking" from over excursion. But without subs you'd run them full range and just keep the bass equalization low.
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