subs w/ amp

atlbravesfalcs7 · Post by **atlbravesfalcs7** » Fri Nov 27, 2009 9:19 am

quick question, its possible to power 2 12 inch 2 ohms alpine type s subs to a power acoustik amp that runs at 4 ohms, right?

Purple RS · Post by **Purple RS** » Fri Nov 27, 2009 10:02 am

Yes, a set of single 2 ohm voice coil subs, if you wire them in series, they'll be a 4 0hm load to the amp.

A set of dual 2 ohm voice coil subs in no configuration will yield a 4 ohm load, you can get 1, 2 or 8 ohm.

http://www.crutchfield.com/S-YeI2A3T6HQ ... iring.html

loudwagon15s · Post by **loudwagon15s** » Fri Nov 27, 2009 10:09 am

first, are you doing this install by yourself? because if you have to ask this question then you might need to do a bit more reading to make sure you are doing everything correct, and here is a great place to start: http://www.the12volt.com/caraudio/woofer_configurations.asp theres tons of good info on that site

atlbravesfalcs7 · Post by **atlbravesfalcs7** » Fri Nov 27, 2009 10:14 am

yea i have had one sub forever now.

but i think i just realized that i never tuned the sub correctly with the amp. do i need a dmm to do this?

atlbravesfalcs7 · Post by **atlbravesfalcs7** » Fri Nov 27, 2009 10:17 am

Purple RS wrote:Yes, a set of single 2 ohm voice coil subs, if you wire them in series, they'll be a 4 0hm load to the amp.

A set of dual 2 ohm voice coil subs in no configuration will yield a 4 ohm load, you can get 1, 2 or 8 ohm.

http://www.crutchfield.com/S-YeI2A3T6HQ ... iring.html

quick question about the 2 2ohm sub diagram to 2 channel amp.

on each of my subs i have 4 terminals the wires can hook up to, on this diagram it is showing that each sub has 2. this is kind of confusing me, is there an explanation im missing?

Purple RS · Post by **Purple RS** » Fri Nov 27, 2009 10:34 am

That answers my question. Four terminals on your subs, you have a pair of dual voice coil (DVC) subs. A question I failed to ask you also answered, you have a two channel amp and I assumed mono.

You can do it this way...

http://akamaipix.crutchfield.com/ca/lea ... hm_2ch.jpg

atlbravesfalcs7 · Post by **atlbravesfalcs7** » Fri Nov 27, 2009 10:42 am

Purple RS wrote:That answers my question. Four terminals on your subs, you have a pair of dual voice coil (DVC) subs. A question I failed to ask you also answered, you have a two channel amp and I assumed mono.
You can do it this way...
http://akamaipix.crutchfield.com/ca/lea ... hm_2ch.jpg

ok yea that makes much more since. im pretty positive that the one sub i have is wired this way.

do you know the best way to tune btw?

Ryan from Ohio · Post by **Ryan from Ohio** » Fri Nov 27, 2009 11:27 am

The best way to set the amps gain is with a DMM.

To "tune" the amp for your music tastes and enclosure takes some playing around.

If you have a sealed box then you should basically be concerned with the LPF section. I would advise around 80-90 Hz.

If you have a ported box you will need to figure the F3 of said box and apply a sub sonic filter if your amp has one. If the box is tuned low enough you probably wouldnt need one then...

atlbravesfalcs7 · Post by **atlbravesfalcs7** » Fri Nov 27, 2009 12:19 pm

Ryan from Ohio wrote:The best way to set the amps gain is with a DMM.
To "tune" the amp for your music tastes and enclosure takes some playing around.
If you have a sealed box then you should basically be concerned with the LPF section. I would advise around 80-90 Hz.
If you have a ported box you will need to figure the F3 of said box and apply a sub sonic filter if your amp has one. If the box is tuned low enough you probably wouldnt need one then...

hmm alright. well when i get the new sub for christmas im going to get it all set up with my old sub then go ahead and do all the tuning for it.

ill come back around that time then. thanks for all the help.

Bwcad1 · Post by **Bwcad1** » Fri Nov 27, 2009 12:36 pm

Ryan from Ohio wrote:The best way to set the amps gain is with a DMM.
To "tune" the amp for your music tastes and enclosure takes some playing around.
If you have a sealed box then you should basically be concerned with the LPF section. I would advise around 80-90 Hz.
If you have a ported box you will need to figure the F3 of said box and apply a sub sonic filter if your amp has one. If the box is tuned low enough you probably wouldnt need one then...

The best way to set the gain is with a oscilloscope. Dmm is a educated guess at best and imo is less accurate than doing it by ear.

F3 is the tuning frequency of the box for those of us that arnt quite up to Ryan's intelligence level.