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Old 14th March 2006, 10:55 PM   #1
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Question Subsonic filter bybass?

Hi all, I just registered to the forum. I ave been reading up on everything so I decided to join.

My first question is: I currently have a new box design for my MTX powered sub. I'm using the same plate amp and driver, but the amp has a subsonic filter which drops 18dbs at 30hz. My new box design with be tuned to 20hz but with this filter I wont be able to achieve optimum performance from this sub. Does anyone here no how to bybass this filter, and location to maybe install a jumper? Or is there another way around it?

Thanks
Jake
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Old 15th March 2006, 06:24 AM   #2
simon5 is offline simon5  Canada
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Well, every amplifier is different, but yeah usually you can change some parts to alter the subsonic filter.

You need to contact the manufacturer probably.
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Old 15th March 2006, 06:39 AM   #3
anton is offline anton  Italy
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generally there is not " much music" under 25-30Hz , that's why many amps have subsonic fixed around 30 Hz. with subsonic your bass response will be more dynamic, fast and clean. many people wish to have subsonic on the amp but they don't.
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Old 15th March 2006, 07:00 AM   #4
simon5 is offline simon5  Canada
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Well I don't agree with this, a 18 dB/octave filter at 30 Hz will not give more dynamic bass response, nor more "fast".

If it's cleaner, then it's just because your driver isn't beefy enough IMHO.
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Old 15th March 2006, 01:28 PM   #5
badman is offline badman  United States
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I agree with simon5. The only reason to high pass a subwoofer at 30 is to keep a cone that can't manage the 'serious stuff' from showing its shortcomings. A high pass in the teens can make sense to keep nonsense like TT rumble and whatnot out of the system, but not up by 30, that's just silly!
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Old 15th March 2006, 04:12 PM   #6
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I just cant have an 18dbs drop at 30hz if I'm tuning the box below that. If anyone knows what to look for on the amp, it would be greatly appreciated. Maybe I can take a picture of the amp and someone can point out what to change or unsolder?
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Old 15th March 2006, 05:22 PM   #7
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Or if anyone knows what the filter looks like or location? I appoligize fopr the ignorence.

Jake
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Old 15th March 2006, 05:25 PM   #8
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It will just be a chip surrounded by capacitors and resistors. You really need to get a schematic from the manufacturers
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Old 15th March 2006, 06:18 PM   #9
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Thanks Al. You think it is between the amp and the input or between the amp and the speaker output? MTX is uncooperative. Very nice people to work with but when it comes to very technical stuff, they are reluctant.
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Old 15th March 2006, 06:48 PM   #10
badman is offline badman  United States
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Quote:
Originally posted by jakelm3075
MTX is uncooperative. Very nice people to work with but when it comes to very technical stuff, they are reluctant.

I think you'll find that's the standard. After all, why should they release their incredible secrets and proprietary technology?
Most companies are reluctant to give up anything, they figure 'give them an inch and they'll take a mile'. I have a neat little sub, for example, a bipole with a highly EQd tiny enclosure. I asked for some information, specifically the transfer function of the amp, so I could work on it: sturdier bigger box. No help was forthcoming, I just wanted to make a bigger stronger box and reduce the EQ accordingly, but retain the same drivers.... no luck.

FWIW: B&W loudspeakers help department was VERY forthcoming when I wanted a little more info on some of their powered towers, to the extent of: crossover schematics, amplifier schematics, construction diagrams, all faxed gratis. Thumbs up to a much maligned company!
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