Anyone wish they had a rumble subsonic filter?

Actually, if the phono preamp is where this circuit would be, if it existed, I don't see why it isn't a feature on all phono preamps.

I was going to add a high-pass filter at 18Hz to my woofer crossovers, but that passive method requires some very large caps and inductors. Might have to revisit that. Also noticed the Bellari phono preamp has a rumble filter. Pretty nice feature on an inexpensive unit.

Thanks Bob. I just talked to Marchand. They do indeed have solutions, the Bassis being one of them. They also can supply the very large inductors needed to add a passive high pass circuit to the woofer crossover itself. I don't think I have rumble, just a bit of subsonic woofer cone movement. Looked at your system. Very impressive!

Couple of things guys. This is a three-way stereo speaker, not a subwoofer. I just looked at the KAB. It turns everything below 180Hz to a mono signal. Seems like a rumble filter should only operate from about 18Hz down like the ones on my old integrated amps used to do.

Hi Hdm. Yes they are ported. And I'm no expert either. Maybe I should contact Kevin as I did Marchand. I still believe that I do not want to attenuate, or mono, any frequencies above 18Hz. And I'm sure you are correct when you say there are high quality and low quality solutions for subsonic crap. I actually have a small problem with my speakers reacting on only certain LPs. They are not flapping all over the place. They are Eton 11 inch woofers, btw, and the cones move very, very easily. That might be compounding my problem.....if indeed it is a problem worth solving! Know what I mean? Injecting additional electronics and ICs to solve something that is more of an irritation than an audible rumble. I'm a little confused, but that's normal in my world:)

OK, guys, and thank you! I now believe I need to solve this rather than ignore it. Going to re-read this thread, visit the websites again, and make couple of phone calls. The one thing my gut tells me not to do, is attenuate above the 20Hz. I just listened to an orchestra recording. In the jacket is a picture. There are no less than five string basses on the far right. There is substancial bass in the far right of the soundstage when I play this LP, and my right amp meter bears this out by showing how hard that channel is working. So I guess I don't believe bass is non-directional. It also sounds like bass will improve overall, by solving the problem and my amp will perform better. Everyone who posted seems to agree on that. That's some really good incentive. Off to the websites......again! And thanks, again.

Hi Newbee. You might be reading my mind. I have been revisiting compliance this morning, looking for errors and ideas. Here's the poop. Scoutmaster, JMW-9 (7.7gm effective mass), ZYX FUJI with silver base for added mass(5gm cartridge + 4gm silver base + .5gm screws) Cartridge compliance of 15 horizontal and 12 vertical gives me resonance at 10 or 11Hz. My thought is to try a bit more mass at the cartridge. I'm also going to pay a lot more attention to the woofer movement on various LPs. I see 3 ways to improvement. Compliance, add high-pass filter to the woofer crossover, or electronic filter. If the high-pass filter at 18Hz didn't require a 700mH inductor, it would be a very good solution, IMO. It seems like everything I do is a collossal struggle, but I intend to win.

Eldartford.....no but I figure about the price of a Corvette. I am with out a cartridge for the moment, so woofer problems have to wait till I solve that issue.