Speaker Related Projects

   3-Way High Efficiency Speaker
(Lavoce, Dynaudio, Foster 3-way. October-2023)

   LCR MTM 3-Channel Speaker
(Three MTM Speakers in One. July-2023)

   Mini7bt - A Minimus 7 Portable Bluetooth Speaker
(Minimus 7 and Dayton Audio. Spring-2022)

   2-Way Ribbon Tweeter Speakers
(Vifa and Pioneer. May-2020)

   Transmission Line Speakers
(Aborted attempt at a TL. September-2012)

   Acoustic Research AR-4x Rehab
(Rehab of a garage sale find. January-2016)

   Infinity RS-4000 Rehab
(Rehab of a garage sale find. June-2015)

(A tall, thin, upwards firing omnidirectional speaker. May-2010)

(A powered subwoofer using a 12" driver and 15" passive radiator. Jan-2010)

(A computer speaker; redux. December-2005)

(A computer speaker in a light canister. Jan-2005)

(10" vented subwoofer in a cardboard tube, powered by a Parapix amp. May-1999)

   MTM Center Channel Speaker
(A Madisound design. Nov-1997)

   2-way Surround Speakers
(5" woofer and 1" tweeter. July 1997)

   3-piece mini system
(6" DVC bass module mated to 4" car speaker. June 1997)

   3-way Vented Floorstanding Speaker
(vented 10" woofer, 5" mid and 1" tweeter in a 4 ft tower. Summer 1995)

   NHT1259 Subwoofer
(A 12" woofer in a sealed architectural pedestal. Winter 1994-95)

   Inexpensive Speaker Stands
(Particle board, sand and spray paint. Fall 1994)

   2-way satellite
(6.5" woofer and 1" tweeter. Summer/Fall 1994)

Audio Electronics Related Projects

  900 MHz Audio Receiver
(Better use for bad headphones. Jan-2008)

  Buster - A Simple Guitar Amp
(Perfect for the beginner. Jan-2010)

  A PC-based Audio Console
(Use a PC to play tunes. Jan-2010)

  LM-12 Amp
(Bridged LM-12 opamps. Aug-2003)

(A CD player and FM tuner from spare computer parts. Oct-2002)

   Quad 2000 4-Channel Amp
(Premade modules by Marantz. May-1998)

   Zen Amp and Bride of Zen Preamp
(by Nelson Pass. Apr-1997)


  Using Wood in Speakers FAQ
(Work in progress)

   MDF FAQ for speaker builders

   Woodworking Tools for the DYIer
(HomeTheaterHiFi.com Oct-1998)

  Some Thoughts on Cabinet Finished for DIY Speakers

   Large Grills Made Easy

   Some Parts Suppliers

Other Useful Stuff

   DIY Audio Related URLs

  Veneering Primer
(by Keith Lahteine)

   How to get a Black Piano Finish
(by DYI Loudspeaker List members)

   Sonotube FAQ
(by Gordon McGill)

   Excerpts from the Bass List
(Oldies but Goodies)

DIY Loudspeaker List

  DIY Loudspeaker List Archives

Infinity RS-4000 Rehab

I came across a pair of Infinity RS-4000 speakers at a garage sale. The foam surround on the midrange was gone and someone had previously replaced the woofers with MB Acoustics drivers. The cabinets and grills were in excellent condition but the reason I bought the pair was for the EMIT tweeters. And best of all the price was right - dirt cheap; a lot less than what the tweeters alone cost on the used market.

Despite my original intentions to just keep the tweeters, I took a peep at what it would take to restore the speakers to their original state. I found an old pair of original woofers in need of new foam on the well-known auction site. I then ordered some new foam surrounds for the mids and woofers, and dusts cap for the woofers and all of a sudden, I had a pair of near new RS-4000 speakers. As an added bonus, I sold those MB Acoustics woofers on the same auction site.

I didn't touch the crossovers nor the cabinets. Here are a few pictures along the way. The Infinity mids have a built-in closed back. The foam surrounds were gone. They looked dirty. Refoaming was a bit tricky - the closed back meant all access and repair had to be done from the front. It wasn't too bad.

Here's one of the speakers with a newly refurbished mid. The woofer is the MB Acoustics unit before I replaced it.

The used woofers I bought also needed new foam and dust cap. Here are before (left) and after (right) pictures of the drivers.

Here's what the end results look like. I like how they came out. The repair job wasn't too difficult nor costly. A nice garage sale find.


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