Want To Set Gains With DMM

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jdubicki

Copper - Posts: 58

Joined: April 11, 2008

Location: Texas, United States

Posted: September 02, 2009 at 4:23 PM / IP Logged

Hopefully you guys can help. This is what I have:

HU - Pioneer DEH-P2900MP

Amp- Alpine MRP-M500 500 Watts @ 2 ohms

Subs - MTX Thunder 4000 200RMS/400Max

DMM - Ideal 61-310 Looks like this:

Want To Set Gains With DMM -- posted image.

Did the formula 400 x 2 = 800, sq root = 28.29

Using 50 Hz test tone and looking to get 30 volts on meter. I can barly get 2. I have tried the different settings on the DMM, but really not sure which one to use. Pretty sure test tone is at 0 db. Please help.

2005 Honda Accord DX

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DYohn

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Joined: April 22, 2003

Location: Arizona, United States

Posted: September 02, 2009 at 4:34 PM / IP Logged

AC volts, 200-volt scale, meter leads connected to the COM and Temp-V-Ohms terminals, measurement taken on amplifier speaker output with the speaker disconnected.

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jdubicki

Copper - Posts: 58

Joined: April 11, 2008

Location: Texas, United States

Posted: September 02, 2009 at 6:56 PM / IP Logged

The speaker has to be completely disconnected?? I have read that you need a load. Some say one terminal connected, others say both. I have done it with pos disconnected and cannot get a reading.

2005 Honda Accord DX

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DYohn

Moderator - Posts: 10,741

Joined: April 22, 2003

Location: Arizona, United States

Posted: September 02, 2009 at 7:22 PM / IP Logged

jdubicki wrote:

The speaker has to be completely disconnected?? I have read that you need a load. Some say one terminal connected, others say both. I have done it with pos disconnected and cannot get a reading.

The speaker should be disconnected. If you cannot get a reading first make sure your meter works. Test it at a household outlet that you know works. Also, you are trying to set a level with a 50Hz tone? Are you sure the crossover or the Xover in the amp is set to LP and at about 80-100Hz?

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i am an idiot

Platinum - Posts: 13,667

This member consistently provides reliable information

Joined: September 21, 2006

Location: Louisiana, United States

Posted: September 02, 2009 at 7:44 PM / IP Logged

You must connect both meter leads to get a reading. Red lead on positive speaker terminal. Black lead on the negative speaker terminal.

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DYohn

Moderator - Posts: 10,741

Joined: April 22, 2003

Location: Arizona, United States

Posted: September 02, 2009 at 7:46 PM / IP Logged

i am an idiot wrote:

You must connect both meter leads to get a reading. Red lead on positive speaker terminal. Black lead on the negative speaker terminal.

Ah yes, I often forget to mention the most basic part of the instructions. I guess I assume too much sometimes ... thanks!

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Want To Set Gains With DMM

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