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Old October 25th, 2011, 8:26 AM
Andrew879 Andrew879 is offline
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Vtf3 mk3 popping

First off I thought maybe my vtf3 mk3s gain was to high but when I purchased my vtf3 mk4 I noticed it wouldn't pop but the mk3 would so its not the signal any suggestions? I've noticed its mainly on lower notes and mainly happens with explosions and helicopter sounds
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Old October 25th, 2011, 11:04 AM
bread29 bread29 is offline
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I had the exact same problem when I first received the MK3. The sub is most likely being stressed during those "explosions" and bottoming out. I turned the Level down in the receiver and the problem went away.
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Old October 25th, 2011, 12:03 PM
Andrew879 Andrew879 is offline
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I just don't see why the mk4 wouldn't and the mk3 would. I have the mk4 a little higher and I used a radioshack DB meter. One other thing what should I set the Q to on the mk4 to match the mk3?
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Old October 25th, 2011, 12:49 PM
Pete_Hsu Pete_Hsu is offline
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Hi Andrew,

Have you tried gain matching each subwoofer? What you have to do is start with one subwoofer in one fixed location (with crossover 'Out', bass extension switch in the down position, phase '0', volume knob 1/4 of the way up). Set your A/V receiver master volume level to a moderate level that you would normally use during music playback. Place the sound level meter at a fixed location (say, 1 foot away from the front of the subwoofer?). Play track 14 on the Test CD. Write down the SPL that is shown on the meter. Then move out the first subwoofer and put the second subwoofer in the exact same location as the first subwoofer. Set everything the same on the subwoofer amplifier (with Q = 0.7 on the VTF-3 MK4), and adjust the volume knob until the sound pressure level is the same as the first subwoofer when playing track 14 on the Test CD.

Then you can move each subwoofer into place.

Note that you may have to reduce the subwoofer channel level on your A/V receiver. When using two subwoofers, the combined level will generally be ~ 3-6dB higher than a single subwoofer, so you can adjust the subwoofer channel level on the A/V receiver to compensate.

Do make sure that each subwoofer is in phase with each other (ie. when you play one subwoofer and then turn on the second subwoofer, then sound pressure level should increase rather than decrease). Then you can flip the phase switch on both units to see if the subwoofers are in phase with the main speakers.

Pete - Hsu Research
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Old February 12th, 2012, 4:04 PM
Andrew879 Andrew879 is offline
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thanks i wasnt even thinking i guess. i was measuring from my main seating location i should have known the room would alter the db of each sub at different locations i will do the test and reply with my results
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