Vicious-Poodle

And here is my latest project, a Sunfire True Subwoofer Junior with the stock Passive radiator replaced with an Earthquake Sound PR:

Here are some wonderful videos of the Earthquake Passive Radiators installed in the 10" and 12" Sunfire Subwoofers. Thanks to Gilbert Rios for listening to my advice and posting the videos: https://www.youtube.com/watch?v=dhQTO6RA47w https://www.youtube.com/watch?v=VNbVGUNx8TY

I'm sad that no one really seems to care on this forum about such a great discovery! However, as promised, even though I am probably talking to myself, the EARTHQUAKE SOUND SLAPS-M10 passive radiator, is a perfect bolt in, no modifications needed, replacement fit for the 10 inch Bob Carver Sunfire True Subwoofer. It was a simple unbolt removal and bolt back install. A custom, perfect fit. The change and increase in bass was DRAMATIC! I couldn't believe the difference. I strongly suggest, even if your passive radiator (right side of the amp plate) is not broken, replace it with this model and you'll be thanking me!

And the answer is 'Yes' and Vicious-Poodle has created THE SUNFIRE TRUE SUBWOOFER SIGNATURE 12 EARTHQUAKE SOUND HYBRID MONSTER!!!! MWAHAHAHAHAHAHAH (Lightning cracklE and thunder crash!) So, about two weeks ago, I purchased on EBay, a used Sunfire 12 inch Signature with a bad amp plate for under $400 in piano black. I always wanted one and that price was a steal. When it arrived, I swapped in the plate from my 10 inch Sunfire Mk II. I was horrified to hear a terrible Death Rattle in the passive radiator. All my research showed no one sells a replacement and the odds of finding used body parts for the 12 incher are slim. I took out the PR and tried rubberized epoxy where the rubber meets the wood disk, glued around the center weight, tried everything, and still the Death Rattle. What to do. And I don't take no for an answer. While watching TV I had an epiphany: The Earthquake Sound Supernova 12 looks and works a lot like this Sunfire. Maybe that passive radiator can be bought and fit in? A search on Ebay showed that there is indeed an Earthquake Sound 12 inch passive radiator for sale. The one closest in size is the SLAPS M-12. Looking at the specs, the cut out needs to be about 1/8th inch larger. The SLAPS technology is better tech than the original passive radiator. There is no spider, glued on disk, heavy center weight that can rattle and cause issues. And it's very affordable! (The original seller on Ebay paid for it! How nice is that?) With a huge wood file in hand (see photo), I enlarged the opening enough for it to fit in snugly. Took about an hour w/ interruptions. The bolt pattern is identical to the original so no new drilling of holes is needed. All the hexagonal bolts were replaced and tightened (one bolt was stripped so I used a larger screw and nut in its place.) Everything was nice and tight so it was time to give it a try. I was beyond amazed! I did a frequency response sweep and there was huge output you feel at 20 HZ diminishing to an unbelievable 14 HZ. The SLAP-12 has like 3 or 4 inches of excursion. Where the Jurrasic World trailer would crash my Sunfire 10's, this monster had no issues. The bass was awesome. It could even do that 16HZ organ piece (Symphony No. 3 (Saint-Saëns). Since this is a better passive radiator than the original, I ordered a SLAPS M-10 for my MK II Sunfire. I think that might even fit in with less filing. I will let you know how that works and if it improves the performance. (Right now these 20+ year old subwoofers seem to easily get over-driven on new material. My theory is it's the passive radiator.) So, everyone, there is a replacement passive radiator for your Sunfire Signature 12. I will let you know in another week, if the same can be done for the 10 inch model. Best wishes and stay safe! V.P. (Here it is in action playing that annoying Bass I Love You. Note its huge excursion!)

Martin has a wonderful post explaining here: http://www.classicspeakerpages.net/IP.Board/index.php?/topic/9263-unusual-dynacos/&tab=comments#comment-111219

Found out it was the Carver Silver Seven Transfer Function amp run in mono mode was refurbished and defective; not the tweeters. There is a Scan that's a better choice from Madisound, Danish made in any event. This tweeter can be used for A25, A25XL, A10 and here's the replacement woofer: https://www.madisoundspeakerstore.com/scanspeak-soft-dome-tweeters/scanspeak-discovery-d2606/9220-1-textile-dome-tweeter/ Woofer https://www.madisoundspeakerstore.com/scanspeak-woofers-6-7/scanspeak-classic-p17wj00-6.5-woofer/ With the Danish made tweeter our A10 gave an early generation B&W 800 serious competition, other than in bass below 45hz. Found out about Emotiva A-300, this is a superb amp and much cheaper than many refurbished "vintage" gear. https://emotiva.com/products/a-300 This is a little incoherent but I agree with his conclusion these are great amplifiers. http://www.theabsolutesound.com/articles/emotiva-a-150-basx-power-amplifier/ Happy New Year, Martin and thanks for the info. When I pulled the U.S.S. tweeter, I found a U.S. patent number, interesting reading. I like these very much and so far, far superior to the Elac Debut, which I'm using as height speakers. They're OK for that. I hope you're doing great and again, Happy New Year.

Hello, Martin. I'm surprised that you like the EPI 100 given your praise of Dynaco speakers (not that I don't admire the restoration done here, great work) but these were really highly reviewed by Consumers Reports. I remember rude high pressure sales people, now out of business decades later, they denigrated the Dynaco A25 they had to demo against, along with the AR-2AX. Personally, I found them too bright (didn't an AR designer say "Who would want to listen to a flat to 20KH speaker?) and monochromatic: I couldn't hear details I heard on the USS driver Dynaco, differences between recording studios and techniques, voices weren't as pleasant, etc. In fact, probably a better cheaper choice now is this much hyped Elac Debut, not as bright to me as EPI 100. https://audioplacebo.com/elac-debut-2-0-b6-2-review/ I'm using Emotiva UMC-200 for digital sources, and changed to Emotiva BasX amplifiers, the Chesky demo disk is heart breaking because their recording techniques leave the big labels in the shade, I wish so many great singers and performers had engineers with their talents. https://www.amazon.com/Ultimate-Demonstration-Disc-Critical-Listening/dp/B00002MXUH Anyway, I wish you all a Happy New Year. I think the retro speakers might outperform in musicality many of these modern offerings but I wasn't fond of EPI. Not as bullet proof as the Dynacos. Foam surrounds, etc. And that harsh character I noted. Accuracy is more than "flat" response, IMHO.

Thanks Martin. That's more than I know about USS; I wonder if they're similar to AR domes. And yes, they do sound great. One of mine went bad. The Vifa D27TG-35-06 1" Silk Dome Tweeter from either Madisound or Part Express sounds very similary to this unit and the SEAS just as an F.Y.I. Also, we use two rear A25XL (with the Vifa, which is better than the origninal domes that rang and blew up) for our 5.4 surround sound home theater: two A10s for the center, with original units, left and right are the A25 with USS drivers except the right now has the Vifa tweeter. In the rears each A25XL has a Sunfire True Subwoofer Junior beneath it (they're mounted on stands) and they add great output from 40HZ down to at least 30. Modified VMPS smaller subwoofer in center, Sunfire Tru Subwoofer Mark II to the left in the front. I guess SVS get deep bass below 20HZ but that would be too much for our room size. Thank you again.

Anything on USS: I never heard of them. Search results return nothing. Does your A25 tweeter show a U.S. Patent number? You can search and mine is an archived patent on domed drivers.

Hello, Martin. I stumbled upon your post. I have the exact same Dyanco A25 loudspeaker (first row on the left) as mentioned in your post and I noted the drivers weren't obviously SEAS (or Scanspeak); the box is stuffed to the gills with pink fiberglass. The tweeter has a U.S. patent number. I never heard of a manufacturer "USS" and can't find anything by searching. Can you tell me more about them? You are right that the high end is more extended than the SEAS units, which were used on the A10s I have but these A25s have the "Dynaco sound" all the same Thanks.