Record Amp High Level out to Computer - diyAudio
Go Back   Home > Forums > Live Sound > Instruments and Amps
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Instruments and Amps Everything that makes music, Especially including instrument amps.

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
Thread Tools Search this Thread
Old 21st January 2012, 06:27 PM   #1
diyAudio Member
Join Date: Nov 2011
Location: US
Default Record Amp High Level out to Computer


I have a Mesa Dual Rectifier 100W head that I would like to record from. I live in a house with others and would like it to be relatively silent when doing so. I bought a 16 Ohm, 100W resistor online to dissipate the power of the head, and I was hoping that I could use the signal across the 100Ohm resistor to record into my computer. See the picture below. The 32K and 100 Ohm resistors have a power rating of 1/4 or 1/2 W. I would just hook this up and find out if it works, but amps and computers are are expensive. Is there any reason why this would not work?

I am using the 16 Ohm output on my amp and using an audio jack and 14 AWG wire to connect the jack to the resistors. My other idea was to use a transformer, but this seems easier (I already have all the parts).

Thank you,

The peak power is shown for the 16, 100, and 32K resistors are shown in the picture below. (In that order)
Click the image to open in full size.
  Reply With Quote
Old 21st January 2012, 06:51 PM   #2
jjman is offline jjman  United States
diyAudio Member
Join Date: Jan 2009
You could add an output control by using a 100 ohm pot instead of the resistor. Same location but take the output to the recorder from the wiper. You need to know the expected voltage of the output which is hopefully 0.4969 after doing the math on the mw figure. They make "attenuators" that have a silent mode and line-level outputs. You are essentially building one that has only silent mode. Sometimes caps are added to adjust frequency results. I have a cheap passive "DI" the provides a line out like this but no attenuation or silent mode regarding main speaker volume. It bypasses some highs to ground but also has a transformer before it's line out. I've read that your approach can sound off regarding EQ but may as well try it raw as a starting point.

Make sure your amp is seeing proper load of course, which the schematic is providing.

Last edited by jjman; 21st January 2012 at 06:55 PM.
  Reply With Quote
Old 21st January 2012, 06:56 PM   #3
diyAudio Member
Join Date: Nov 2011
Location: US
I was thinking the same thing with the pot. I will look into the attenuator though, thank you!
  Reply With Quote
Old 22nd January 2012, 12:03 AM   #4
diyAudio Member
Join Date: Apr 2010
You may want to plug your amp and the computer in the same power bar. You do not want to get a ground loop going between them.
  Reply With Quote


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
(minimal) speaker level vs. line level high pass filter noviygera Analog Line Level 1 15th October 2011 09:43 AM
Pioneer PDR-609 cdr record level kit_freiesleben Digital Source 3 5th October 2009 06:56 PM
lesser of two evils, high level -> line level, digital volume control mazurek Solid State 3 19th November 2006 12:25 AM
Using high level in on sub amp? squidbait Subwoofers 14 30th January 2004 11:06 AM

New To Site? Need Help?

All times are GMT. The time now is 10:01 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2