Importance of power supplies - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

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 16th December 2007, 07:34 PM   #1
diyAudio Member
Join Date: Aug 2005
Default Importance of power supplies

Back in the day I bought a Technics SA-AX920 Class H receiver and was more than happy with it. One day I decided I wanted to hook into a computer with digital and surround sound and all of the bells and whistles so I bought a Kenwood VR-7070. As soon as I turned it on I noticed a reduction in bass, now I wasn't sure at the time if it had better highs or weaker lows since my woofers were garbage, well so were my mids and highs honestly. But overall the kenwood sounded better, cleaner brighter etc.

Last night however I hooked up an ultracurve pro eq between the computer (S/PDIF) and the 7070 and eq'd the sub +-0.5 dB 20-125 Hz 1/3 oct, however I could only eq the computer and the tv was feeding directly into 7070 bypassing the eq, not cool.
I realized that I needed a preamp so I wired the 7070 as the preamp and the Technics as the power amp with the eq in between, all is good now.

When I powered up the system and played some tracks (same tracks as played through 7070) we instantly noticed cleaner less distorted bass (w/ flat eq now) and the drum set on the test disc actually sounded much closer to a live drum set whereas the sound through the 7070 sounded muddy, loose and compressed. The cone was not controlled by the 7070 as well either.

My theory about this is based on some experience with old welders vs. new welders where the old welders with big expensive heavy power supplies produced significantly cleaner welds with almost no spatter. In reference to these amps the 7070 is physically huge and the knobs, faceplate and body are all metal, it is 1/2 wider and taller and ~2.5in deeper compared to the Technics which has plastic knobs and face with a thin metal case. The weight of the 7070 is about 27 lbs and the Tech. is about 22 lbs and is focused in one corner like it has a 19 pound power supply, the 7070 seems to have a heavy case and a lightweight power supply.

Is the beefier power supply the reason for the more accurate bass or am I misinterpreting my results here?

Feel free to get technical with your answer if needed, I am an ME not an EE but I understand electronics.
Conventional methods yield conventional results
  Reply With Quote
Old 18th December 2007, 08:37 PM   #2
diyAudio Member
Join Date: Aug 2005
Any thoughts on why this happened?
Conventional methods yield conventional results
  Reply With Quote
Old 18th December 2007, 09:13 PM   #3
diyAudio Member
jackinnj's Avatar
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
It's the reason that the Pulaski Skyway hasn't fallen down, but the bridge of the same design in Minneapolis did -- back "in the day" they under-designed and over-built the Pulaski Skyway -- it can take about 4 times the load and is built over a former swamp.

I bet that it smells worse comin' off the Pulaski skyway, however.
  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
power supplies jjac7212 Everything Else 0 13th May 2008 09:57 PM
Parallel a dual power supply or two power supplies? Thunau Power Supplies 12 16th February 2007 04:21 AM
50V power supplies, qty=2 kjunom Swap Meet 0 27th December 2004 09:32 PM
Power Supplies guitargully Parts 0 6th February 2004 03:45 AM
Regulated Power Supplies for Low Power Amps PTL60 Solid State 18 6th February 2002 06:24 AM

New To Site? Need Help?

All times are GMT. The time now is 10:36 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