Madisound Services
Retrofits: Replacing Woofers
Madisound receives many requests for replacement drivers for older systems, where manufacturer replacements are no longer available.
If your speaker is not in Suggested Replacements (below), we need the following information in order to help you find a replacement woofer. We will do our best to find a match for your speaker with this information.
Before calling, answer these questions:
- What is the diameter of the woofer, from outside edge to edge?
- What is the cutout hole size for the woofer?
- What is the speaker box dimensions, length x width x depth?
- If the speaker box has a vent (tube where air can come in and out)? What is the diameter and length of the vent?
- Does the woofer have a foam surround or rubber surround?
- Is the cone material paper, polypropylene or something else?
- Is the frame a cast metal or a stamped sheet metal?
- What is the i mpedance? (usually 4 or 8 ohms. If the impedance is not marked it can usually be inferred from the DC resistance of the unit. If you need assistance with measuring this contact us.)
Suggested Replacements
- 3D Acoustics:
Replacement parts and repair: www.regnar.com
- A/D/S:
Replacement parts and repair: www.regnar.com
- Advent Speakers & Acoustic Research (AR) Speakers: Replacement parts and repair: www.regnar.com
- Advent Legacy:
One of our customers has used the Seas H2831 as a replacement for the 10" woofer in the Legacy. You have to use new screw holes, but the cutout is the correct size. He says the midrange was more pronounced than before, but the overall sound quality was an improvement. Perhaps increasing the value of the series inductor in front of the woofer would decrease the midrange output. If there is a capacitor in parallel with the woofer, you could also try increasing the value to decrease midrange output.
- Allison CD-9: The SEAS H1189 tweeter is a good replacement though you will have to notch the Allison cutouts slightly to fit the wiring terminals.
- Apogee ??? The Vifa P17WG00-061 woofer.
- Apogee Centarus The Vifa M22WR09-061 woofer.
- B&W: Replacement parts and repair: www.regnar.com
- Carver - Several Home Theater Models
- Peerless 830341 - 5", 4 ohm speaker - 126WR26 81CD
- Peerless 8303421 - 5", 4 ohm speaker - 126WR26 72CD DM
- Peerless 8303431 - 5", 4 ohm speaker, shielded - 126WR26 72CD TV
- Peerless 8303441 - 6.5", 4 ohm speaker, shielded - 176WR26 81CD TV
- Celestion:
For replacement parts and repair: www.regnar.com
- Dahlquist:
Replacement parts and repair: www.regnar.com
- Dunlavy Audio Labs, LLC:
To match the drivers in your SC- or other model Dunlavy speaker, you would have to remove the drivers from the cabinet and inspect them for size and model number. Then call us at 608-831-3433 or refer to our Dunlavy equivalency chart found below.
We don't have a stock or prebuilt crossover or schematic for Dunlavy speakers.
Most of these replacement drivers are now discontinued. Buy your replacements now!
| 1001 |
12" Woofer |
Vifa M30WO-491 |
| 1003 |
5" Mid-Bass |
Vifa P13WG00-081 |
| 1004 |
7" Mid-Bass |
M18WO081 |
| 1008 |
6.5" Mid-Bass |
P17WJ00-08 |
| 1012 |
1" Dome Tweeter |
D27TG35-06 |
| 1014 |
6.5" Shielded Mid-Bass |
P17SJ00-081 |
| 1029 |
4" Cone Midrange |
M10MD39-081 |
| 1033 |
5.5" Shielded Mid-Bass |
M13SG09-08 |
| 1035 |
8" Woofer |
P21WN20-081 |
| 1036 |
1" Shielded Dome Tweeter |
D27SG05-061 |
| 1045 |
10" Woofer |
25W/85651 |
- Dynaco A25 Tweeter & woofer Replacement:
The tweeter for this speaker is no longer in production and Seas recommends using their new Sonotex fabric dome, the 27TFFC (H881). A newer version of the woofer is being made by Seas and the part number is 25F-EW (H085).
- Dynaco A25 Tweeter Replacement:
A customer has replace his tweeter with the Morel MDT20, which is an exact drop in replacement including the screw holes. "The sound is wonderful and has given these old speakers a new life."
- Infinity Kappa 8.1: The Vifa D75MX41 is a perfect replacement.
- Infinity Monitor IIA:
One of our customers has recommended the Swan3051 woofer as a drop in replacement. He shortened the port from 6" to 4" and says "The bass response may be better than the original." Another customer has confirmed this to be a nearly identical replacement.
- Kef: Kef has repair parts for some of their older products. You have to give them the “SP” reference number when inquiring from them; you can’t just use T27A or T33A. Please contact Kieran Billmann at KEF America; Tel: 732-683-2356 or kbillmann@kefamerica.com.
- Kef 107 Replacement Woofers: WAM Engineering experimented with the Seas CA26RFX (H1305) as a replacement for the 10” woofers in the Kef 107 speaker. They said these woofers worked great and would recommend them as a good replacement. Download PDF for measured curves.
- Kef T33A Replacement: A good replacement for an 8 ohm Kef T33A is the Morel MDT30S tweeter. The T33A is a 95mm square tweeter and the MDT30S is a 94mm round tweeter. The cut out hole is the same diameter. The MDT30S won’t cover the same physical area as the square T33A tweeter, but it will still fit within the area of a recessed (flush mounted) T33A tweeter. The tweeter will work with the existing crossover and is an acceptable replacement.
- Optimus LX-5: One of our customers has recommend the Seas P14RC (H395) woofer as a good replacement/upgrade to the LX-5 woofer.
- Spica TC50:
The Audax tweeters used in this speaker are available again! The new tweeter is the Audax TW025A2, replacing the old part number of HD100D25.
The woofer is the Hif17JVX 4 ohm and we don't know of any similar speaker to replace this driver. Tri State Loudspeaker in Aliquippa, PA will rebuild the voice coil on your old woofer for about $45.00.(as of 2/05) www.nauticom.net/www/speakers
- Spica TC60:
The Vifa D27TG45 is a drop-in replacement tweeter.
- Von Schweikert Audio:
Albert has upgrades to most of his speakers, contact them if you want to modernize your current speaker: Tel 760-410-1650
- Von Schweikert Research
- VR-3: The midrange can be replaced with the Audax HM130C0, while supplies last. The front tweeter is the Vifa D25AG35-06 and the rear tweeter is the D19TD-05-08, both on our Vifa catalog page.
- VR-4: There are two 8" woofers, the Madisound 8154's, these are out of production. We recommend using the Peerless 8325561. The midrange can be replaced with an Audax HM130C0. The front tweeter is the Vifa D25AG35-061 and the rear tweeter is the D19TD05-08, both on our Vifa catalog page.
- VR-4.5:
There are two 8" Eton 8-800 woofers, see the Eton page. The midrange can be replaced with an Audax HM130C0. The front tweeter is the Vifa D25AG35-06 and the rear tweeter is the D25AG-05-061, both on our Vifa catalog page.
- VR-6:
There are two 8" Eton8-800 woofers, see the Eton page. The midrange can be replaced with an Audax HM130C0. There are two Focal TC120TDX21 tweeters, one front and one back.
- VR-6:
The midrange can be replaced with an Audax HM130C0.
- Various driver replacements for JBL, Altec, Bozak & AR:
www.coilguru.com
Footnotes
- This speaker is no longer available through Madisound.
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