2. analog
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Question on Output Music Hall MMF-5 / Sumiko Pre

I have recently gotten back in to Analog for fun and on a budget and it has been great. However, on a couple of records I have been listening to my woofers will start to flap forward in long strides yet I hear nothing. They are moving so violently fast and with long strides it is flat out scary looking.

Is this due to a lack of a subsonic filter in the phono pre? Am I going to damage my speakers. It is just wierd.. I have never experienced this with any other source. My system is below and I would truly appreciate any feedback.

Thanks

Chris

Electrocompaniet ECI-3
Tyler Acoustics Taylo Reference Monitors
Music Hall MMF-5
Sumiko Phono box
AQ Diamond Back from Sumiko to my Int. Amp.
128x128the_kid

Showing 1 response by upstateaudio

upstateaudio
249 posts
 
Chris, the records that are causing the woofer flapping are probably warped. Warping creates subsonic signals that are transmitted to your cartridge to the preamp to amp and subsequently to the woofers. If you play your speakers loudly this could cause clipping and subsequent damage to your speakers. Excessive woofer cone excursions themselves could also be damaging. Your amp is being forced to amplify this signal.

I would suggest you try to unwarp those records, play them at low volume, get a phono preamp with a subsonic filter or get replacements. Good luck.
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