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In Reply to: RE: Non Vented Sub For Music System posted by AudioSoul on September 01, 2016 at 17:04:56
I'll bet if you place the sub against a wall or better yet, in the corner of your room, it will probably go a lot lower than 60-Hz. I would think you should get flat response down to 40-Hz or slightly lower. I'm glad to hear you like it, though.
I bought a pair of Rythmik servo subs in sealed enclosures. However, I discovered that the servo system actually makes them perform just like ported speakers. When I turn the servo control to maximum, the diaphragm responds to my turntable's arm/cartridge resonance and the woofer pumps just like a ported speaker. When I set the servo control to minimum, it acts like a sealed speaker and does not pump. It also has a rumble filter and I've been using that to eliminate pumping with the servo set to maximum for tighter bass. They really sound best that way.
Does your sub have a rumble filter? What settings have you found to provide the best performance?
Best regards,
John Elison
Follow Ups:
Actually, I have my sub sticking out in front of my 103.2's for time alignment purposes. My sub doesn't have a rumble filter and I don't think I need one since my sub doesn't go that low (60hz). From what I have read a rumble filter can cause phase shift. But, if you have rumble in your system I would choose no rumble vs some phase shift. Right now I have my sub set to 1/3 power and the crossover @ 60hz that's as low as it goes. So far I am very satisfied with this set up. It doesn't go much lower than the 103.2's alone but adds some punch to the music. Some would consider this a mid bass hump.
The crossover of 60-Hz is the upper frequency of your subwoofer's frequency response. In other words, you've set the subwoofer to respond to frequencies below 60-Hz and it will respond to very low frequencies even below 20-Hz since it is a ported subwoofer. The only way you will know if you need a rumble filter is to observe the diaphragm to see if it is pumping when you play a record. If your phono stage reproduces ultra low frequencies as mine does, you will observe subwoofer pumping, which in turn produces intermodulation distortion. You are correct that a rumble filter introduces phase shift, but subwoofer pumping along with its associated intermodulation distortion is less desirable than phase shift caused by a rumble filter.
Best regards,
John Elison
Thanks John, when I listen to music tonight I will check for rumble...
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