Measuring amp performance - diyAudio
Go Back   Home > Forums > Amplifiers > Class D

Class D Switching Power Amplifiers and Power D/A conversion

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 27th May 2006, 03:08 AM   #1
diyAudio Member
 
Join Date: Mar 2006
Location: Seattle
Default Measuring amp performance

I recall reading that the t-amp didn't have great bass performance... and I they had modified it to improve this (well okay, many people have).

Anyway, they had posted before/after graphs (frequency vs db I believe)... and my question is simply "how do you measure this". I am currently using an inexpensive home theater style receiver (6.1 type thingy from Sony), and I am interested in doing some measurements on it.

Thanks,
Silly.
  Reply With Quote
Old 27th May 2006, 07:11 AM   #2
diyAudio Member
 
theAnonymous1's Avatar
 
Join Date: Feb 2004
Location: Anonymityville
I am a complete newb, so If I needed to do something like this and only had my newb logic and limited equipment to work with, this is what I would do...

Take a resistive load, i.e. 8ohm, and connect it to the amp. Now play sine waves through the amp at all the frequencies you want to measure and check the voltage across the load for each frequency. So if your amp rolls off at the low end you should see lower voltages as the frequency decreases in that region.

Non-newbs feel free to correct me.
  Reply With Quote
Old 27th May 2006, 08:23 AM   #3
Bgt is offline Bgt  Netherlands
diyAudio Member
 
Join Date: Jan 2005
Location: NL, Voorschoten
use a 50hz sq. wave and look if it is ruler flat on top and bottom. On a scope ofcourse. Try to borrow a scope if you don't have 1. There is hardly any other cheap way to measure it. Multimeters are a pain.
You can mostly tell from the schematic where the roll of will be.
__________________
Kind regards,
Bert
  Reply With Quote
Old 28th May 2006, 02:49 AM   #4
john65b is offline john65b  United States
diyAudio Member
 
john65b's Avatar
 
Join Date: Jan 2005
Location: Chicago
Instead of osciliscope, maybe WINSCOPE and a laptop/desktop?

Winscope is a free download, but you could fry your computer if not connected correctly...Anyone have any experience with Winscope?
  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
High performance measuring software Snickers-is Multi-Way 25 5th February 2005 02:49 PM
Measuring Performance? mwh-eng Solid State 8 1st March 2004 11:29 PM
Measuring amp performance mray Car Audio 1 29th February 2004 02:20 PM


New To Site? Need Help?

All times are GMT. The time now is 06:24 PM.


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