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Old 06-17-2006, 03:23 PM   #1
mneste8718
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Question Running 6 speakers with a 4ch amp, is it possible?

Ok, I have a set of CDT components in the front and Alpines on the rear deck. I wanted to add 2 more speakers to the rear doors. Can I run this considering I have the stock HU and a 4ch JBL amp. Is there any way to bridge 2 speakers into 1 channel? Thanks for the help

and if this is impossible, what would I have to do to make it work?
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Old 06-17-2006, 03:31 PM   #2
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You can always hook up both sets of wires to one channel. They will have to split the wattage between the 2 sets of speakers but they'll both still work.
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Old 06-17-2006, 03:34 PM   #3
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so its that simple? I always thought there would be problems with doing that...
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Old 06-17-2006, 03:35 PM   #4
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Any speakers you could recommend to maybe give me some bass?

On a side note, The CDT-CL51s or w/e they're called that everyone here recommended for me to get plainly suck so much balls that its ridiculous. Even if I increase the base by 1 in the HU, they immediately start raspingno matter what volume which is bull**** cause I want my Alpines to get more bass, but thats just impossible now and the amp can only give so much...

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Old 06-17-2006, 04:04 PM   #5
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You can split off wires and connect multiple speakers but the speakers will run hot and literally burn out much faster (read about ohms). You can always buy a multichannel crossover system (some with bypass) to add additional speakers.
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Old 06-17-2006, 04:07 PM   #6
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you can only achieve bass with larger movement of air... you need a bigger speaker and/or longer throw, coupled with a crossover. You can't really consider good bass with just standard speakers either. go for a subwoofer.
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Old 06-17-2006, 04:11 PM   #7
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could you give me a link to such a crossover
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Old 06-17-2006, 05:05 PM   #8
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Quote:
Originally Posted by mneste8718
On a side note, The CDT-CL51s or w/e they're called that everyone here recommended for me to get plainly suck so much balls that its ridiculous. Even if I increase the base by 1 in the HU, they immediately start raspingno matter what volume which is bull**** cause I want my Alpines to get more bass, but thats just impossible now and the amp can only give so much...
If its their lack of midbass/bass you're upset about, you didn't do enough research. The CDT61s would have done a better job, being 6.5", but they still lack a lot in the midbass area.

If clarity is an issue though, I'd investigate your setup. I ran a set of CL-61as for more than 2 years, and liked them enough to pickup the HDs this time around. Sounded fantastic getting 120 watts rms with relatively conservative gain setting.

EDIT: btw, why do you want 3 sets of speakers?

Last edited by tenth; 06-17-2006 at 05:21 PM.
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Old 06-17-2006, 05:10 PM   #9
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Quote:
Originally Posted by Izomorph
You can split off wires and connect multiple speakers but the speakers will run hot and literally burn out much faster (read about ohms). You can always buy a multichannel crossover system (some with bypass) to add additional speakers.
why would running speakers in parallel be any different than subwoofers?

I'm no expert, but I'm not sure what the problem would be so long as the amp is stable to 2 ohm stereo.
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Old 06-17-2006, 05:27 PM   #10
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There is a some of bad information in this thread.

Yes you can wire up 6 speakers to a 4 channel amp. If are talking about adding a second set of speakers to the rear channel, your existing and new speakers are 4 ohms, and your amp is 2 ohms stable, then you can wire them up in parallel and possibly see an increase in out put from the amp.

If your amp can only support a 4 ohm load and you try that trick with 2 ohms of load, you will cause problems with the amp (not the speakers). The option then is to wire up the second set of speakers in series, reducing the output of the amp slightly in trade for adding speakers.

Personally, don't do it. You wont get that much out of it for all the work you will be doing to rig it.
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Old 06-17-2006, 05:34 PM   #11
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well I am just looking for more punch.... more bass... would the better option be to just get another amp?
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Old 06-17-2006, 05:39 PM   #12
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better option would be to go for a bigger driver dedicated to bass, making sure to supply it with appropriate power.

Do you have the 3rd set already? Adding another set of components or coaxials isn't going to solve your issue with lack of bass, but will create more problems in imaging and tuning.
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Old 06-17-2006, 05:48 PM   #13
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no I haven't bought anything, i haven't thought about adding a bass speaker because of how heavy those things usually are. Are there any that work well without weighing 50lbs?
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Old 06-17-2006, 06:12 PM   #14
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Quote:
Originally Posted by mneste8718
no I haven't bought anything, i haven't thought about adding a bass speaker because of how heavy those things usually are. Are there any that work well without weighing 50lbs?
ANY subwoofer dedicated to playing sub-frequencies will play bass better than a full range. If weight is such a concern, fiberglass an 8" sub in the sparetire well. It'll weight about the same as the spare tire itself.
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Old 06-17-2006, 06:46 PM   #15
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keaniegenie +1

A proper driver in a proper enclosure with a proper amp will be a much better solution. It can even be very economical.
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Old 06-18-2006, 12:28 AM   #16
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Quote:
Originally Posted by mneste8718
no I haven't bought anything, i haven't thought about adding a bass speaker because of how heavy those things usually are. Are there any that work well without weighing 50lbs?
Elemental Designs makes a 6.5" sub, the EU-700. They are not much heavier than a regular 6.5" speaker, but will reproduce lower frequencies with much more authority. You'd be better off with a couple of those than adding more full range speakers. I would recommend a second amp for them, or ditch your rear speakers and run these on the rear channels instead. The best part is they are only $50 each.

http://edesignaudio.com/product.php?...pid=32&cur=USD

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Old 06-18-2006, 09:37 AM   #17
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Quote:
Originally Posted by khail19
Elemental Designs makes a 6.5" sub, the EU-700. They are not much heavier than a regular 6.5" speaker, but will reproduce lower frequencies with much more authority. You'd be better off with a couple of those than adding more full range speakers. I would recommend a second amp for them, or ditch your rear speakers and run these on the rear channels instead. The best part is they are only $50 each.

http://edesignaudio.com/product.php?...pid=32&cur=USD

This seems really nice, especially for $50. What amp would I need to run 2 of these in my trunk? Also, I like to listen to techno music, will this sub work with it?

Right now I have 2 speakers in the rear deck. Should I move those into the rear doors and put 2 of those Eu-700s in the deck?
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Old 06-18-2006, 10:35 AM   #18
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Quote:
Originally Posted by mneste8718
This seems really nice, especially for $50. What amp would I need to run 2 of these in my trunk? Also, I like to listen to techno music, will this sub work with it?

Right now I have 2 speakers in the rear deck. Should I move those into the rear doors and put 2 of those Eu-700s in the deck?
To use those and get decent response, you'll need a separate amp or a serious amount of power.

Read what was posted again. You do NOT want to run another set of speakers off your amplifier. Those little subs want 100watts RMS for each one. So if your 4 channel amp is around 100x4, then ditch your rears, run those instead, and amp them off the rear channel on your amplifier. You'll need a built-in crossover on your amp to cut off the higher frequencies so the subs will operate correctly. If you don't have one, you'll need to purchase a separate crossover as well, or some type of inline crossovers(cheaper, but often introduce a bit of noise...but maybe worth trying).

If you try to run these off your amp with the rear set of coax's, unless that amp's really, really powerful(200x4 range), you'll probably end up frustrated with the output of these subs.

Frankly, rather than deal with them, I'd just double-check your install on the CDT's. They should have modest bass output. Not sure what you're expecting, but techno/dance music has a lot of low, low end, that regular speakers of any type just can't reproduce at a serious volume level. You need a subwoofer for that. You need to put at least some sound deadening in your door to help those speakers with low-end(not sure why you got the 5.25 version instead of the 6.5" though). Then, I'd just get an 8 or 10" single sub, rather than two 6.5"s listed earlier. Either run it off the rear two channels of your amp(again, ditching the rear speakers) or purchase a small 150-200watt amp to power it separately. You can fiberglass an enclosure into the spare tire well, WITH the spare tire still included for an 8 or 10" driver. You don't even have to remove the tire.
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Old 06-18-2006, 12:01 PM   #19
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hmm, well the CDTs are 6.5", I guess I have the 61s... I'm going to try and fiddle with the amp some more and yes it does have a built in cross over...

I guess maybe the best option is to get a 10" sub and mount it somewhere in the trunk (in some sort of enclosure).... Could you recommend me one that I might like for the type of music I listen to. And also with that an amp... remember though that I am on a budget, the cheaper the better.
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Old 06-18-2006, 12:05 PM   #20
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Quote:
Originally Posted by LastResort
There is a some of bad information in this thread.

Yes you can wire up 6 speakers to a 4 channel amp. If are talking about adding a second set of speakers to the rear channel, your existing and new speakers are 4 ohms, and your amp is 2 ohms stable, then you can wire them up in parallel and possibly see an increase in out put from the amp.

If your amp can only support a 4 ohm load and you try that trick with 2 ohms of load, you will cause problems with the amp (not the speakers). The option then is to wire up the second set of speakers in series, reducing the output of the amp slightly in trade for adding speakers.

Personally, don't do it. You wont get that much out of it for all the work you will be doing to rig it.

thank you.... I was just reading this thread like WtF???
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Old 06-18-2006, 01:22 PM   #21
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Quote:
Originally Posted by mneste8718
hmm, well the CDTs are 6.5", I guess I have the 61s... I'm going to try and fiddle with the amp some more and yes it does have a built in cross over...
What's the rms rating per channel on the amp? Where's the crossover currently set? How did you set the gains?

Quote:
I guess maybe the best option is to get a 10" sub and mount it somewhere in the trunk (in some sort of enclosure).... Could you recommend me one that I might like for the type of music I listen to. And also with that an amp... remember though that I am on a budget, the cheaper the better.
If you don't mind elemental design, they're currently running a group buy.You may need to signup to their forum to view the the thread.

http://www.icixsound.com/vb/showthread.php?t=26191

Any amp with a low-pass crossover supplies right around the power the sub requires at the right resistance will do the job. Local/used/ebay should do the trick.
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Old 06-18-2006, 01:31 PM   #22
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This is the AMP: JBL P80.4

Output 4 Ohms 40W x 4
Output 2 Ohms 80W x 4
Output 4 Ohms Bridged 160W x 2
Signal-to-Noise Ratio >110
Frequency Response (3dB) 10Hz - 50kHz
Total Harmonic Distortion 0.05%
Input Sensitivity 250mV - 4V

360-Watt 4-Channel Power Amplifier
Variable electronic crossover allows the user to precisely tailor systems designs easily.Operates Simultaneous Stereo / MonoLine Level Sensitivity 250mV - 4VTHD @ Rated Output 0.05 Frequency Response 10Hz - 50kHzSignal to Noise (dBA) >110Output 4 Ohms Bridged 160w x 2Output 2 Ohms 80w x 4Output 4 Ohms 40w x 4

Variable 12dB electronic crossover allows the P-80.4 to be configured for a variety of applications


The four channels of the P-80.4 can also be configured into three channels or even two channels - this allows for increased expansion capabilities and system flexibility


"Direct-Connect" allows choice of 4 - 8-gauge power and ground cable


Die-cast chassis uses entire amplifier footprint for cooling - and it looks awesome!


High-output MOSFET power-supply topology doubles power into 2 ohms
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Old 06-18-2006, 04:38 PM   #23
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So I found this set... I'm only interested the sub, enclosure and amp. Seems like a good company and I am not looking for my whole car to be shaking from the bass. Do you guys approve of this?

http://www.sonicelectronix.com/item_6744.html

also looking at this and making my own enclosure for it...
Amp:
http://www.sonicelectronix.com/item_6870.html
Sub:
http://www.sonicelectronix.com/item_2172.html

Last edited by mneste8718; 06-18-2006 at 09:01 PM.
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Old 06-18-2006, 09:51 PM   #24
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I still need help guys....
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Old 06-18-2006, 11:54 PM   #25
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that kit looks to be more of the all show no go variety. Boss is also not known to put out terribly accurate ratings on their amps. I know Hifonics makes an okay amp, but I know nothing of their subs.

What kind of budget are you looking at for a sub and amp, and what size sub would you be willing to accept (8 or 10, just 10)? Making your own enclosure is definitely a good idea. MDF is pretty cheap.

The issue you may be having with the CDTs is a lack of power. They aren't particularly strong below 100hz or so, but more power should help quite a bit. As an experiment, you could try running the amp bridged providing the CLs with 160Watts, with extremely conservative gain setting and a high pass crossover set pretty high (~100hz), they should be okay and sound quite a bit better. I ran 120 to each and I was pretty satisfied with them.
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