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thump

  1. R

    Rock Solid PowerBass 8" Active Subwoofer

    Hi Folks I picked up a vintage 8" PowerBass Active Subwoofer made by Rock Solid (part of the Bowers & Wilkins stable) last week. Given it's size, specifications and wattage, I am surprised and delighted with how well it fits into my set-up and room configuration. It is being fed a line level...
  2. H

    Yamaha A-1 amplifier thump on power off.

    Hi, I have a Yamaha A-1 that I’ve been working on and is now sounding great and has stable readings for Drive Circuit DC Offset, Idling Current, Power Supply voltage as per the manual. But, powering off just now by pressing the power button on the amp led to a substantial thump through the...
    • Hifibythekg
    • Thread
    • a-1 power supply thump thump in speaker yahama amplifier
    • Replies: 89
    • Forum: Yamaha
  3. sean sweeney

    Pioneer SA-9500 ii rebuild protect thump fix!

    I've been dealing with this 9500ii thumping ever since I rebuilt the amp and recapped, from the protect circuit (also rebuilt with upgraded caps and transistors)! It seems the more efficient newer transistors in the protect circuit were staying on too long at shut down and coming on instantly...
    • sean sweeney
    • Thread
    • circuit fix modification pioneer protection sa-9500ii thump
    • Replies: 4
    • Forum: Pioneer Audio
  4. runningdog

    2275 pops when powering on, and off

    This Marantz 2275 pops when powering on, and less so when powering off. Not the 'thump' of a 1060 powering up. But a noticeable and measurable pop, in both channels. The pops are varying each time, peaking between .5 volt up to 3 volts. When the main amps and relay are in circuit, the pop...
  5. K

    12-18 volt 5 amp mini timer flashable,no plugin needed

    Found a 5 amp mini timer i can use for my amp to delay the speaker output turn on.The amp is a BiAmp cpa130 .The mini timer can be flash programmed and works from 5-18v input ,max 5 amp output.I can get a couple relays and tie the output through relay and itll give me the 3 second delay i need...
    • klipschoid
    • Thread
    • amp biamp commercial amp delay thump
    • Replies: 4
    • Forum: DIY
  6. D

    Thumping / Beating Noise From Speakers During Playing

    I have a great pair of Boston A100 and A150, recently though I noticed when I started up the A100s there seems to be this almost thumping or "door knocking" sound, especially prominent near the end of the record. It's very hard to describe, it's a soft thumping sound with maybe one second...
    • DeanC
    • Thread
    • boston acoustics noise thump
    • Replies: 15
    • Forum: Speakers
  7. thekid72

    JBL TLX-PS10/12 Subwoofer power on thump. Normal?

    I picked up a JBL TLX-PS10 powered subwoofer locally on the cheap, seller upgraded to a true home theater subwoofer and this fits my need for adding extension to bookshelf speakers just fine. It does have one possible issue, and that is when it cycles on (automatic signal sensing with no bypass)...
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