Question about setting gain with a DMM

JAYNO20 · 02-09-2013, 03:16 AM

I have an older Rockford Fosgate 500.2 unit (2002 model) and I had some questions about setting the gain. Everything I have read shows to take the RMS wattage X the ohm then get the square root of that. My only problem is since my amp is technically a 2 channel I am wondering how I do this with it in bridged mode.

That wouldn't normally be an issue aside from the fact that this amp also has a left and a right gain control. Now the amp is 500 RMS x 1 at 4 ohm bridged OR 125 x 2 @4ohm stereo. How would I go about using a DMM to set these gains as close to perfect as possible?

RonRizz · 02-09-2013, 04:38 AM

I would set gains for left and right individually, using your 125 watts, regardless of whether youre bridging or not. Cant fail.

JAYNO20 · 02-09-2013, 06:54 AM

Quote:

Originally Posted by RonRizz

I would set gains for left and right individually, using your 125 watts, regardless of whether youre bridging or not. Cant fail.

That's what I'm thinking too.

02-09-2013, 03:16 AM	#1 (permalink)
JAYNO20 Track Member Join Date: Mar 2012 Location: Pittsburgh, PA Posts: 802 Drives: 2010 370Z Nismo Rep Power: 14	Question about setting gain with a DMM I have an older Rockford Fosgate 500.2 unit (2002 model) and I had some questions about setting the gain. Everything I have read shows to take the RMS wattage X the ohm then get the square root of that. My only problem is since my amp is technically a 2 channel I am wondering how I do this with it in bridged mode. That wouldn't normally be an issue aside from the fact that this amp also has a left and a right gain control. Now the amp is 500 RMS x 1 at 4 ohm bridged OR 125 x 2 @4ohm stereo. How would I go about using a DMM to set these gains as close to perfect as possible? __________________ 2010 Solid Red NISMO #0334 - SOLD 2014 Red Hot Camaro ZL1

02-09-2013, 04:38 AM	#2 (permalink)
RonRizz A True Z Fanatic Join Date: Aug 2011 Location: Pine grove, Pa Posts: 2,135 Drives: 2 feet, 3 pedals Rep Power: 6774	I would set gains for left and right individually, using your 125 watts, regardless of whether youre bridging or not. Cant fail. __________________ P99rs Head Unit--- Amps- 2 Pioneer Prs800d --- Zapco ST1000MX---Zapco ST-4XSQ---- SI BM mk5 Subs---SI TM65v2 Midbass--- SI M3 mids--- SI M25 xbl2 tweeters ----- 2016 MECA street class 3rd place at world finals

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