Amp and Sub question - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Audio (and aftermarket electronics) This is your place for alarms, remote starters, to brag about your system, exaggerate your db levels, or simply ask questions for stock or aftermarket audio. No Flames! (except from roasted amps)

Reply
 
 
 
Thread Tools Search this Thread
Old 04-07-2004, 09:55 PM   #1
Senior Member
Certified Car Nut
Thread Starter
 
Join Date: Oct 2003
Posts: 19,756
Thanks: 0
Thanked 0 Times in 0 Posts
1993 SLE is on a distinguished road
Default Amp and Sub question

Ok here is goes: I will be putting in 3 12" (150 RMS) subs this summer. My question is with this setup what will RMS (amp) need to run these without underpowering them. also how many channel amps? I was thinking run the outer 2 subs with one amp and then running the middle one with another amp. another thought that crossed my mind is running a seperate amp for each sub.

Help audiophiles
1993 SLE is offline   Reply With Quote
Old 04-07-2004, 10:11 PM   #2
Senior Member
True Car Nut
 
GAMEOVER's Avatar
 
Join Date: Aug 2003
Location: Racine Wi
Posts: 5,146
Thanks: 0
Thanked 0 Times in 0 Posts
GAMEOVER is on a distinguished road
Default

you can wire them in series-paralell?
GAMEOVER is offline   Reply With Quote
Old 04-07-2004, 10:13 PM   #3
Senior Member
Certified Car Nut
Thread Starter
 
Join Date: Oct 2003
Posts: 19,756
Thanks: 0
Thanked 0 Times in 0 Posts
1993 SLE is on a distinguished road
Default

there are SVC so I am assuming Parallel
1993 SLE is offline   Reply With Quote
Old 04-07-2004, 10:21 PM   #4
Senior Member
True Car Nut
 
Join Date: Feb 2004
Location: Western MA
Posts: 2,708
Thanks: 0
Thanked 1 Time in 1 Post
randman1 is on a distinguished road
Default

Here is a psudo-audiophile opinion. First, I need to know the impedance of the subs. Without knowing that here'* what you get:

Three 4 ohm drivers in parallel= 1.333 ohm total impedance
Three 6 ohm drivers in parallel= 2 ohm total impedance
Three 8 ohm drivers in parallell=2.667 ohm total impedance.

I would use one amp, bridged perhaps, to run all subs. Bridging an amp into any of the above impedances it would need to be 1 ohm stable. I would not recommend the first example if bridging, use a mono amp. Check the RMS rating of the amp @ say 2 ohms. You'll find that it is noticable higher than at the "standard" 4 ohm load. With this info, I would get an amp that does not exceed the rating of the drivers (150w RMS).
randman1 is offline   Reply With Quote
Old 04-07-2004, 10:42 PM   #5
Senior Member
Certified Car Nut
Thread Starter
 
Join Date: Oct 2003
Posts: 19,756
Thanks: 0
Thanked 0 Times in 0 Posts
1993 SLE is on a distinguished road
Default

there are 4 ohm

so i would need a 500RMS amp then?? would it be mono or multi channel?
1993 SLE is offline   Reply With Quote
Old 04-07-2004, 11:38 PM   #6
Senior Member
True Car Nut
 
Join Date: Feb 2004
Location: Western MA
Posts: 2,708
Thanks: 0
Thanked 1 Time in 1 Post
randman1 is on a distinguished road
Default

Sorry for the delay. 56k BLOWS!

This is how I'd do it:


This is series parallel. The sub on the bottom will "see" full applied voltage and current because it is the one connected in parallel. For this reason, the max output of the amp should not exceed the max rating of the sub. You'll notice that the "total impedance" of what the amp sees is 2.667 ohms (yes, that screwed up symbol at the end is my offering of an omega). This means that the amp you choose should be a maximum of [sub'* max rating] watts @ 2.667 ohms. Don't let the math scare you.

If your sub is rated at 150w RMS, look for an amp that is rated at 150w RMS @ 2 ohms if you wire the subs this way.

There is a multitude of ways to connect the subs. If you understand the basic principles, you can create an optimized system. Feel free to ask if you need further assistance.
randman1 is offline   Reply With Quote
Old 04-08-2004, 12:13 AM   #7
Senior Member
Certified Car Nut
 
Join Date: Jun 2003
Posts: 15,928
Thanks: 0
Thanked 0 Times in 0 Posts
BonneMeMN is on a distinguished road
Default

Whoa, don't do that! That'* not good setup at all. All SVC systems should be parallel, and mixing like this, isn't good at all.
BonneMeMN is offline   Reply With Quote
Old 04-08-2004, 12:18 AM   #8
Senior Member
Certified GM nut
 
Join Date: Sep 2002
Location: Eden Prairie, MN
Posts: 1,728
Thanks: 0
Thanked 0 Times in 0 Posts
zzzzzeke is on a distinguished road
Default

get a 1 ohm stable mono amp........150 watt rms........what kinda subs are those.......you could probably get better results from 1 12" with a 500 watt rms.......!!!!!!!!!

even though BONNEMEMN says more power handling doesn't make a louder sub.......its just a generalization!
zzzzzeke is offline   Reply With Quote
Old 04-08-2004, 12:19 AM   #9
Senior Member
Certified Car Nut
Thread Starter
 
Join Date: Oct 2003
Posts: 19,756
Thanks: 0
Thanked 0 Times in 0 Posts
1993 SLE is on a distinguished road
Default

lets summarize:

I need a mono amp? (yes/no)

what wattage amp do i need to look for? (Max and continous)




so the negative of the subs go to the negative of the amp and the posivite of the subs og to the positive of the amps? (yes/no)
1993 SLE is offline   Reply With Quote
Old 04-08-2004, 12:20 AM   #10
Senior Member
Certified GM nut
 
Join Date: Sep 2002
Location: Eden Prairie, MN
Posts: 1,728
Thanks: 0
Thanked 0 Times in 0 Posts
zzzzzeke is on a distinguished road
Default

that looks parallel to me..........would drop u to a 1.33 ohm load.........so u would need a 1 ohm stable amp........not very easy to come by at a cheap price!
zzzzzeke is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
New sub.. Biggest sub ever!!!!!!!!!! No joke! Check this out!!!!! raptor660 Audio (and aftermarket electronics) 18 07-08-2011 08:29 PM
amp and sub question bonny99 Audio (and aftermarket electronics) 4 10-22-2009 07:19 PM
$&)$&*)#&+()#%& )#@(%&#)%*(&+_ Maymybonnieliveforevr Lounge 6 05-02-2007 07:07 PM
Stock Head Unit and Sub/Amp installation question crazyjoe Audio (and aftermarket electronics) 13 05-21-2006 05:18 PM
Amp, Sub, & Tweeter Question Lowrider0308 Audio (and aftermarket electronics) 18 01-24-2005 03:46 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 01:23 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.