Cheapest rumble filter ....

[ThomasW]

Musiciansfriend.com is having one of it's infamous one day sales on the Furman Q-1311, for $60+shipping. It has a graphic filter at 10Hz. It's only 12dB/octave but should help protect those with smaller displacement IB's from being killed by DVDs like WOTW or Batman Begins. (no guarantee though).

Caveat emptor! I haven't use one of these, so this is just a guess on my part. Experiment if you want and have a spare $60

www.musiciansfriend.com/srs7/search/detail/base_pid/181227/src=01340

[jvgillow]

Actually they've had that price for about 2 weeks now. It's a clearance item though so stock won't be guaranteed indefinitely.

I'm not an IB guy but I use one for my SVS CS-Ultra and it helped a lot on movies like Hitchhiker's Guide to the Galaxy where there is 5 Hz bass in a particular scene, far below the 16 Hz tuning frequency. It also has a ground-lift switch which is handy if you are using unbalanced connections (like me).

The high-pass filter on the Q-1311 is adjustable from 10 Hz up to above 200 Hz so you have some flexibility. When I was discussing the use of a 12 dB/octave filter with Tom V at SVS he said I could probably set the filter around 24 Hz, put a boost on my BFD at 20 Hz to fix the 16-24 Hz region, and have a faster rolloff in the lower ranges. I didn't go through that much trouble, as I found a plain setting of 16 Hz on the high pass worked pretty well.

[ThomasW]

Actually they've had that price for about 2 weeks now. It's a clearance item though so stock won't be guaranteed indefinitely.

Hi, thanks for that info. They're infamous for short term sales. Someone finds to something cool and posts a link, then the next day it's back to the old price.

[jimlowe]

This looks pretty interesting, is the ground lift switch on the rear, because I don't see it on the unit, and I can't seem to find the manual or rear picture of the unit?

[jimlowe]

Well, it's gone already! But I found this nearly identical unit, for a little more money, although it is bigger. www.musiciansfriend.com/srs7/g=live/search/detail/base_pid/181312/

[ThomasW]

Just a update these are back in stock again

[mazeroth]

Do you guys think this would be a wise purchase for $60+shipping or should I just get a Feedback Destroyer from PE for $99 with free shipping?

[ThomasW]

This is not a replacement for the BFD. It has one band that can be used as a rumble filter.

[jimlowe]

Any thoughts on this one? I purchased one of these EQ's for use as a rumble filter and for a short while I was picking up a radio station It was playing through the sub, and would go out when i disengaged this eq, in other words bypass mode. Shortly after it went away even when eq was engaged, but this is truly wierd, any thoughts? Cheap wire? Besides that it was really nice to listen to Wotw with no bottoming!

[hdjunkie]

jimlowe said:

Besides that it was really nice to listen to Wotw with no bottoming!

jimLlowe,

What did you have the EQ set at? 10hz 12? 16?

Mine is on the way too. WotW is just too hot. I can crank the hell out of THe haunting, Star wars Pod race, and other good bass movies without the IB breaking a sweat. But WotW is just too much.

[jimlowe]

I played around with the settings, anywhere from 10-15 and a little above(it's a knob with various settings, 10 and 15 being the lowest, the next 40). I really didn't go nuts but set at 10 hz it did NOT bottom on wotw, now that being said, I was a bit gun shy having bottomed them on this movie before, but all sounded well at around the same volumes that bottomed them pre-EQ. Hope this helps, and ps, I still am not able to reproduce that phatom radio station i heard, hopefully it's gone for good! I will keep the filter around 10 hz for now, and let you know if I have any problems. By the way, when the EQ was engaged I needed to set the subwoofer level about 6 settings higher to achieve the same loudness, but not when it is bypassed.

[ThomasW]

FYI, 'phantom' radio stations are usually caused by a defective IC cable or the IC connector at the end of the cable.

[jimlowe]

Thanks Thomas, I'll check that out.

[jimlowe]

Update to my phantom radio station. I switched out the interconnect and I'm still getting it! It goes away immediately after i disengage the EQ, so I'm returning the EQ as defective and getting a new one, shipping paid for by musician's friend(really easy to deal with). I'll let you know if this works.

[mannthey]

I have heard of capacitors being wired in rca's between the pre-amp and amp stage to achive a basic high pass filter. I don't know much about passive pre-amp filters. I was wondering if anyone else know about this pasive form of crossovers?

What kind of slope would something like this create and could it be used as a rumble filter?

[ThomasW]

Line level devices are usually 6dB/octave. If you go to a steeper roll-off, the insertion losses become problematic.

Here's one such design
www.t-linespeakers.org/tech/filters/passiveHLxo.html