Measuring amp performance

Sillyboy · 27th May 2006, 03:08 AM

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.

theAnonymous1 · 27th May 2006, 07:11 AM

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.

Bgt · 27th May 2006, 08:23 AM

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.

john65b · 28th May 2006, 02:49 AM

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?

27th May 2006, 03:08 AM	#1
Sillyboy diyAudio Member Join Date: Mar 2006 Location: Seattle	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.

27th May 2006, 08:23 AM	#3
Bgt 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

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

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?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	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

27th May 2006, 07:11 AM	#2
theAnonymous1 diyAudio Member 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.

28th May 2006, 02:49 AM	#4
john65b diyAudio Member 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?