8 tens in a shared box?

[iwearpro 10+ year member]

Hello,I am new to the boards and back into car audio...So I got this wiled hair and decided to doa project in my show car...my plan was to install 8 tens in a my car and my buddy that is into audio and has been longer then I have told me to put build a shared enclosure....Ok here is what Im working with...I bought 8 10" jackhammers that my local circuit city had on sale...Its mainly for the wow factor in a show car. Now after installed it dont hit as hard as two used to in the same car and same amp....Now I wired 4 in series,the other 4 in series and then ran the 2 groups of 2 in parallel for 2ohm and 2 ohm load......

Please dont flame me as I have been out of the game for some time and am kind of out of the loop,but am still somewhat familiar with audio.

any feedback as to why the subs arent doing the job...I ruled out my amp and installed my buddies Boston that kills his 12's...no luck its still the same.

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[jeremiah 10+ year member]

what amp do you have?

 

[Cameron_B 10+ year member]

You are probably underpowering the subs.

The subs split the wattage according to the ohm load.

The statement I made about you underpowering them is assumed unless you have a 4000wrms amp.

 

[djman37 5,000+ posts]

4 svc subs in series is 16 ohm per group!!!

you could wire the groups in parallel to get 1 ohm per group and series that for a 2 ohm load.

 

[iwearpro 10+ year member]

yeah I have 2 in series to 2 in series then those 4 in parallel,2 in series to 2 in series then those 4 in parallel....then I took them again and went parralel again...I figured a ohm load of 2 ohm per 4 and I wired the amp in 2 ohm stereo.....Ok here is where I may get flamed....lol...

I am running a punch 75 25 to life...The birth sheet shows 732 watts at 2 ohm.... It may be small but it hit as hard or harder with 2 tens....Is it the shared box or I wonder if I need to go through the wiring again?

 

[dave_damage 10+ year member]

Get a more powerful amp please sir.

 

[x2o 10+ year member]

yeah I have 2 in series to 2 in series then those 4 in parallel,2 in series to 2 in series then those 4 in parallel....then I took them again and went parralel again...I figured a ohm load of 2 ohm per 4 and I wired the amp in 2 ohm stereo.....Ok here is where I may get flamed....lol...I am running a punch 75 25 to life...The birth sheet shows 732 watts at 2 ohm.... It may be small but it hit as hard or harder with 2 tens....Is it the shared box or I wonder if I need to go through the wiring again?

It's probably the fact that each sub is only seeing about 90 watts.

 

[Dre20xl 10+ year member]

whats the rms on a 10" jackhammer?

 

[DePratt 10+ year member]

10in jackhammer = 200 rms

200x10= 2000rms

you have an underpowering issue

 

[DidUHearThat? 10+ year member]

What did you make the box out of?

What is the ohm load of each sub?

Not sure I follow your ohm load calculations. Use a meter to test the leads going to the amp, I think you may have it wired incorrectly and have a high ohm load resulting in only about 40 watts per speaker or less.

 

[DePratt 10+ year member]

oh and just so you know... the more subs you have the more power u need... not sure if that registered for you

 

[DidUHearThat? 10+ year member]

Holy crap!!! That's a 120 watt amp?!!!? Bridged at 4 ohms!!!

That's 15 watts per sub! If you wired it wrong it's as little as 7 watts per sub!

Rockford Fosgate 25 To LIFE Punch 75 2 Channel Amp
Amplifier Type: 2-channel

RMS Power @ 4 Ohms: 37.5W x 2

THD at 4-Ohm RMS Power: 0.08%

Bridged RMS Power @ 4 Ohms: 120W x 1

http://carjamz.com/zen/index.php?main_page=product_info&products_id=1558

My front stage and rear fill are getting 4 times that in a low power SQ system, not including my sub.

 

[DePratt 10+ year member]

i really didnt know what to do... he must have been out of the game for a long time

 

[Dre20xl 10+ year member]

..

 

[Dre20xl 10+ year member]

200x10= 2000rms

you have an underpowering issue

he only has 8 tens so 1600. why would a person buy x amont of subs and put no where near the rms they should have to them. a sub should sound decent with a little more then half the rms, if the power isn't the prob then yes he has ohm problems.