Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Ring-Modulated Sound from Vintage 12" Magnavox Driver
Ring-Modulated Sound from Vintage 12" Magnavox Driver
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 2nd March 2011, 08:16 PM   #1
SlunkBoy is offline SlunkBoy  United States
diyAudio Member
Join Date: Jan 2007
Default Ring-Modulated Sound from Vintage 12" Magnavox Driver

As stated in the title, I'm having issues with a 12" driver salvaged from an old Magnavox hi-fi console. The bass frequencies suffer from a pronounced ring-modulated sound that, while noticeable at full volume, is very prominent at lower volumes. Deep male vocals have a tendency to set it off more than anything else.

I have tried two different known-good amplifiers, a variety of sources, high-impedance drive, and zobel filters - all to no avail. An adjustable second-order active high-pass filter was effective at eliminating the buzz, but at the expense of so much bass content as to render the whole enterprise pointless. I even polished the contacts, thinking that corrosion might have had some sort of intermittent diode effect at low volumes. Additionally, the driver passes a visual inspection with flying colors.

I don't recall this being a problem prior to a recent move, but I didn't have a chance to do enough critical listening beforehand to say definitively that it is a new issue. The only thing I haven't thought to try is rotating the driver, but it doesn't really sound like anything is rubbing.

Has anyone ever encountered a speaker acting as a ring-modulator? To misappropriate a Radiohead lyric, "it's buzzing like a fridge, it's like a detuned radio." Call the Karma Police, indeed.

Last edited by SlunkBoy; 2nd March 2011 at 08:18 PM. Reason: Inaccurate Terminology
  Reply With Quote
Old 2nd March 2011, 08:44 PM   #2
DSP_Geek is offline DSP_Geek  Canada
diyAudio Member
Join Date: Aug 2003
Location: Santa Cruz, California
Sounds like a few turns of the voice coil have become unglued from the former.
  Reply With Quote


Ring-Modulated Sound from Vintage 12" Magnavox DriverHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Two 15" late 1950s Vintage Magnavox Woofers with Alnico magnets for sale! WBS Swap Meet 0 23rd February 2009 11:22 PM
Speaker cabinet for vintage 12" philips driver divingboy Full Range 1 28th December 2008 09:39 AM
FS: Vintage 10" Magnavox FR pair (Australia) Brisso57 Swap Meet 1 2nd January 2008 04:02 AM
Vintage German 12" Alnico Driver tgroendahl Full Range 8 14th April 2006 09:59 AM
The real sound is 12" driver. felixx Full Range 0 29th July 2005 07:13 AM

New To Site? Need Help?

All times are GMT. The time now is 03:26 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio