h/u pre amp voltage vs amp input voltage

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=120952
Printed Date: May 15, 2025 at 2:45 AM

Topic: h/u pre amp voltage vs amp input voltage

Posted By: monorail
Subject: h/u pre amp voltage vs amp input voltage
Date Posted: March 25, 2010 at 3:44 AM

I have an older amp with an input voltage rating of 500mv. I'm looking at a newer H/U with a pre-amp of 2V. Is this doable or do I need to upgrade the amp too?

Replies:

Posted By: oldspark
Date Posted: March 25, 2010 at 3:59 AM

So you need to reduce 2V to 0.5V....
What a blessing!

It might be as simple as a 4:1 resistor/voltage divider...
IE - for 10k-Ohm impedance - 2V into 7.5k & 2.5k series connected resistors (with 2.5k on GND side) and the 0.5V out from the 2.5k.

Posted By: i am an idiot
Date Posted: March 25, 2010 at 5:56 AM

The amplifier has a gain control knob, simply turn it down a bit.

Posted By: monorail
Date Posted: March 26, 2010 at 9:49 AM

So it's that simple? There will be no damage to the amp?

Posted By: Steven Kephart
Date Posted: March 26, 2010 at 9:55 AM

It won't damage the amp. Here's a link that explains it in detail: https://www.bcae1.com/preoutv.htm

Posted By: i am an idiot
Date Posted: March 26, 2010 at 9:01 PM

It is that simple, and no it will not damage your amplifier.

Posted By: monorail
Date Posted: March 27, 2010 at 12:12 AM

Thanks much guys!

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