John H
Second Unit
- Joined
- Nov 27, 1998
- Messages
- 472
I had been using a pair of Definitive Technology PF18TL subwoofers in my system since early 1998. I never had a problem with either unit.
In October of last year I upgraded to a pair of Velodyne HGS-18's. Both units produced a slight "woosh" fan type sound if you placed your ear right next to the driver. I was told this is normal for the Servo controled models.
About 2 weeks later one of the subwoofers noise became much louder. It could be heard very easily from my 12' listening position during quiet passages. My dealer replaced the unit.
When calibrating my system yesterday with a subwoofer test tone I noticed the other original unit was making a strange type noise. It is hard to describe. Sort of like rapid machine gun fire but with a different tone. It also still tries to produce the test signal.
This occurs at extremely low or high output levels while playing the test tone. The noise gets louder and softer as the subwoofers gain control is increased and decreased. It can be completely eliminated with the gain turned all the way down. It sounds like a problem with the amps circuitry.
I hooked up the unit to my other subwoofers feed to rule out the cable. I also tried the other line level input to eliminate a faulty RCA input jack. I did not try the speaker level inputs.
I can not believe I have had two of Velodynes flagship HGS units fail within 4 months. This one has to be shipped back to the manufacture for warranty repair.:frowning:
John
In October of last year I upgraded to a pair of Velodyne HGS-18's. Both units produced a slight "woosh" fan type sound if you placed your ear right next to the driver. I was told this is normal for the Servo controled models.
About 2 weeks later one of the subwoofers noise became much louder. It could be heard very easily from my 12' listening position during quiet passages. My dealer replaced the unit.
When calibrating my system yesterday with a subwoofer test tone I noticed the other original unit was making a strange type noise. It is hard to describe. Sort of like rapid machine gun fire but with a different tone. It also still tries to produce the test signal.
This occurs at extremely low or high output levels while playing the test tone. The noise gets louder and softer as the subwoofers gain control is increased and decreased. It can be completely eliminated with the gain turned all the way down. It sounds like a problem with the amps circuitry.
I hooked up the unit to my other subwoofers feed to rule out the cable. I also tried the other line level input to eliminate a faulty RCA input jack. I did not try the speaker level inputs.
I can not believe I have had two of Velodynes flagship HGS units fail within 4 months. This one has to be shipped back to the manufacture for warranty repair.:frowning:
John