Just a thought…
Unscrew the woofer, rotate it 180 degrees and reinstall. ??
These are old drivers and if you have some sag in the woofer this might resolve it. ?
It costs nothing to test it.?
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On Feb 9, 2025, at 3:40?PM, katie8664hall via groups.io <katie8664hall@...> wrote:
?
Many of us have original spares. It would not take much to get your hands on one.
Sent from my Verizon, Samsung Galaxy smartphone
-------- Original message --------
From: "Ed Marrs via groups.io" <ed.marrs123@...>
Date: 2/9/25 6:16 PM (GMT-05:00)
Subject: [DahlquistSpeakers] DQ10 Woofer Distortion
I've been experimenting and adding a few dbx components in order to improve dynamic range of cassette and vinyl playback.? Component include sub-harmonic synth (120X-DS and Dynamic Range Expander with Impact Restoration 3BX III).? However, I have have recently notice left channel distortion coming from the left DQ10 woofer, when played at a higher volume and with all dBx equipment bypassed.? The DQ10 pair has all original cross-over components.? I have confirm that this is not an amplifier issue by swapping channels.? I am trying to understand the failure mechanism when a speaker is blown.? Is it an over heated voice coil wiring where insulation simply melts off the coil, a voice coil that over extends normal excursion, or perhaps failure of a cross-over component?? Wondering if I can repair.? Playing back a 200 Hz tone at higher volume and lightly touching the cone, the distortion seem to be tamed.? The attached image shows a left and right channel distortion measurement with REW and a UMIK-2.? Above 400 Hz, it seems (at least to my hears) to play normally.? Would hated to replace the one original advent driver.? Suspect I would have to replace both.? Any suggestion for a good replacement if Woofer is beyond repair.? ??
<DQ10 Left Damaged Woofer.jpg>
<DQ10 Right Woofer.jpg>
