4ohm or 2 ohm sub on a JL 500/1? - diyAudio
Go Back   Home > Forums > General Interest > Car Audio

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 20th October 2004, 05:00 PM   #1
diyAudio Member
 
Join Date: Oct 2004
Send a message via AIM to lukemc11 Send a message via MSN to lukemc11 Send a message via Yahoo to lukemc11
Default 4ohm or 2 ohm sub on a JL 500/1?

I have a JL 500/1, most likely getting another (got the first one cheaper than it would to get a 1000/1). It runs 500rms to 1ohm, 2 ohm, and 4 ohm. I was curious to if I would get more power on a 4 ohm sub, or a 2 ohm sub, or would there be any difference what so ever. I am new to car audio, but I noticed most amps don't have high RMS in 4 ohms. I would probably be running 2 S12L74's.
  Reply With Quote
Old 20th October 2004, 11:46 PM   #2
diyAudio Member
 
Join Date: Nov 2003
Location: Pittsburgh, PA
Send a message via Yahoo to curtis73
Running the sub at a lower resistance will increase the output of the amp. Amps are often rated for a resistance at which they are stable. If you have an amp that is 2-ohm stable, run the sub(s) in such a manner that you're providing 2 ohms. More resistance is safe and actually easier on the amp, but won't maximize the combo.

If you run too little resistance, think of it as letting too much electricity flow through the amp and it will fry.
__________________
Audiophile by ear, but I don't know crap about the math
  Reply With Quote
Old 21st October 2004, 04:01 AM   #3
diyAudio Member
 
Join Date: Aug 2004
Location: Great White North, eh?
Send a message via ICQ to SupraGuy Send a message via Yahoo to SupraGuy
Default Re: 4ohm or 2 ohm sub on a JL 500/1?

Quote:
Originally posted by lukemc11
I have a JL 500/1, most likely getting another (got the first one cheaper than it would to get a 1000/1). It runs 500rms to 1ohm, 2 ohm, and 4 ohm.
According to the spec sheet at JL's website the amp provides 500W RMS at anything from 1.5 to 4 ohms impedance, with the sensitivity adjusted to the target woofer's impedance. This means that there is zero benefit to using a lower impedance driver.

Now consider this: Into lower impedance loads, amplifiers typically have lower (worse) S/N ratios, higher (worse) THD, and lower (You guessed it, worse) damping factor.

Take a look at page 11 of the Owner's manual and you'll see the specifications. Note that the THD, S/N ratio, and damping factor are all rated at 4 ohms? That would be because this gives the best results. (Also because JL observes industry standards of rating at 4 ohms.)

All things being considered, you will get the most out of this amplifier by running a 4 ohm subwoofer setup to it.

For other amplifiers, you may be able to get more by running lower impedance loads, however, more power isn't everything. Remember that the lower impedance comes at the price of THD, S/N ratio etc. You'll get more power, but at lower quality. If you want a SQ setup, then you're better off getting the more powerful amplifier, or just living with less power. (That 500/1 has more power than my entire system, but I feel that I have enough.)
__________________
There are 10 types of people in the world. Those who understand binary, and those who don't.
  Reply With Quote
Old 25th October 2004, 01:25 AM   #4
diyAudio Member
 
Join Date: Oct 2004
Send a message via AIM to lukemc11 Send a message via MSN to lukemc11 Send a message via Yahoo to lukemc11
Default Thanks

Thank you for your help. I understand a little better now ; it's getting there
  Reply With Quote

Reply


Hide this!Advertise here!
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


Similar Threads
Thread Thread Starter Forum Replies Last Post
4ohm amp to 8 ohm sub question olly-s Subwoofers 4 1st July 2008 11:40 PM
4ohm Resistance icecoolwas Car Audio 7 26th May 2008 10:35 AM
4ohm and 8ohm LR4 xo LukeDuke Multi-Way 1 17th April 2008 06:09 PM
8ohm or 4ohm? adrrad Chip Amps 5 21st October 2007 05:29 PM
1 sub - DVC 4ohm each. What amp? big_kahunah Subwoofers 0 27th December 2006 01:22 AM


New To Site? Need Help?

All times are GMT. The time now is 10:47 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2