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Re: DQ10 Woofer Distortion

 

I'll testify to Simply Speakers Advent 12's I just installed in my 20's (I had no choice to rebuild.) And they sound fantastic. The fit was exact with mounting screws. Purists cover your eyes!! No but really...I'm really happy!


On Tue, Feb 11, 2025, 10:36?AM texmex_87102 via <texmex_87102=[email protected]> wrote:
My original 'Advent' woofers were stolen, or too far gone . . . I replaced them with Simply Speaker 12"ers and they are just fine. I know originality is a good thing, but just sayin' . . . it is hard to repair or replace the old Advents with the square magnet.?

On Tuesday, February 11, 2025 at 06:20:46 AM MST, Jeff Katz via <qstieee=[email protected]> wrote:


If you're not a DIY person, this is where I'd send speakers




On Tuesday, February 11, 2025 at 08:07:35 AM EST, Ed Marrs via <ed.marrs123=[email protected]> wrote:


Some good news.? Removed the woofer last night and found the voice coil slightly rubbing.? On closer inspection I discovered that the glue holding the surround had let go in several places.? Should be an easy fix.? It’s interesting that whomever previously replaced the surrounds did so with the concave side of the surrounds facing outside facing toward the listener.? I don’t think it matters, but found it odd.? Thank you everyone for all your suggestions.

IMG_1429.jpeg

Re: DQ10 Woofer Distortion

 

My original 'Advent' woofers were stolen, or too far gone . . . I replaced them with Simply Speaker 12"ers and they are just fine. I know originality is a good thing, but just sayin' . . . it is hard to repair or replace the old Advents with the square magnet.?

On Tuesday, February 11, 2025 at 06:20:46 AM MST, Jeff Katz via groups.io <qstieee@...> wrote:


If you're not a DIY person, this is where I'd send speakers
http://www.millersound.net/



On Tuesday, February 11, 2025 at 08:07:35 AM EST, Ed Marrs via groups.io <ed.marrs123@...> wrote:


Some good news. ?Removed the woofer last night and found the voice coil slightly rubbing. ?On closer inspection I discovered that the glue holding the surround had let go in several places. ?Should be an easy fix. ?It’s interesting that whomever previously replaced the surrounds did so with the concave side of the surrounds facing outside facing toward the listener. ?I don’t think it matters, but found it odd. ?Thank you everyone for all your suggestions.
Re: DQ10 Woofer Distortion

 

If you're not a DIY person, this is where I'd send speakers
http://www.millersound.net/



On Tuesday, February 11, 2025 at 08:07:35 AM EST, Ed Marrs via groups.io <ed.marrs123@...> wrote:


Some good news. ?Removed the woofer last night and found the voice coil slightly rubbing. ?On closer inspection I discovered that the glue holding the surround had let go in several places. ?Should be an easy fix. ?It’s interesting that whomever previously replaced the surrounds did so with the concave side of the surrounds facing outside facing toward the listener. ?I don’t think it matters, but found it odd. ?Thank you everyone for all your suggestions.
Re: DQ10 Woofer Distortion

 

Some good news. ?Removed the woofer last night and found the voice coil slightly rubbing. ?On closer inspection I discovered that the glue holding the surround had let go in several places. ?Should be an easy fix. ?It’s interesting that whomever previously replaced the surrounds did so with the concave side of the surrounds facing outside facing toward the listener. ?I don’t think it matters, but found it odd. ?Thank you everyone for all your suggestions.
Re: DQ10 Woofer Distortion

 

if you’re sure the distortion is coming from the woofer sounds like a replacement is in order.
Re: DQ10 Woofer Distortion

 

No popping sound before I noticed distortion.? I did to 180 degree rotation and was unsuccessful in solving the distortion.? ?
Re: DQ10 Woofer Distortion

 

Ed when in circuit that is about right and indicates the resistors are probably OK. The voice coil should also not be melted.
Still could be mis centering or voice coil deformation. Did the speaker make any popping sounds before you noticed this distortion? If so you probably have a situation where the voice coil contacts the back plate and bends the coil in or out.?
Generally easier to just replace if that is the case.
Re: DQ10 Woofer Distortion

 

I have a set of original yellow cap xo’s in storage. I’m not sure what’s going on with your xo ‘s, but the lQQk a mess with wires cut and bridged . I’m sure you know ?that some of the cap connections have bridges under the board. Theres images in the files illustrating the connections?

On Sun, Feb 9, 2025 at 8:54?PM Ed Marrs via <ed.marrs123=[email protected]> wrote:
Charlie, thanks the suggestion.? A quick measurement of the 4ohm resistors shows 2.9 ohms each.? I do have a left and right sub, but unfortunately at some point decided to send full range from the Sub harm. synth ?to the DQ10s, instead high pass (a switch on the dBX 120 sub-harm synth).? This may have nevbeen my mistake.? I will still try the 180 rotation. ?
Re: DQ10 Woofer Distortion

 

Charlie, thanks the suggestion. ?A quick measurement of the 4ohm resistors shows 2.9 ohms each. ?I do have a left and right sub, but unfortunately at some point decided to send full range from the Sub harm. synth ?to the DQ10s, instead high pass (a switch on the dBX 120 sub-harm synth). ?This may have been my mistake. ?I will still try the 180 rotation. ?
Re: DQ10 Woofer Distortion

 
Edited

Here is a diagram showing resistor and woofer connections

You are looking for R1a and b and the green and white wires. On the far right.
?
?
Re: DQ10 Woofer Distortion

 

The sub harmonic synth may have damaged the woofer by causing it to try to reproduce frequencies below what it is capable of.?
It could be a bent or misshaped voice coil or maybe the surround has torn loose on one side. Inverting the woofer as described may work, at least temporarily.
?
But based on your curves I suspect the two 4 ohm resistors that are wired in parallel with left woofer. If they show any signs of burning be suspicious. Either way you might want ?to test ?with an ohmmeter. Measure across the wires that go to the woofer. (Usually green and white) Anything higher than 5 ohms means those resistors are burned open and both should be replaced.?


In either case if you want more bass you might want add sub(s) and a crossover that properly high passes the DQ10.?

Let us know if you need any help.
?
Re: DQ10 Woofer Distortion

 

Thanks for the suggestion. ?I will try.
Re: DQ10 Woofer Distortion

 

Thank you for the offer. ?I will first try the suggested 180 rotation.
Re: DQ10 Woofer Distortion

 

Woofer rotation solved my similar?problem with a Bozak B302a.? So certainly good advice.? I have DQ-20 too and never had to rotate but Bozak was probably ten years older?




On Sunday, February 9, 2025, 6:45 PM, William Meyer via groups.io <williammeyer.c@...> wrote:

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.?


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>
Re: DQ10 Woofer Distortion

 

If you need an original woofer with new surround, DM me

On Sun, Feb 9, 2025 at 6:45?PM William Meyer via <williammeyer.c=[email protected]> wrote:
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.?


On Feb 9, 2025, at 3:40?PM, katie8664hall via <katie8664hall=[email protected]> 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 " <ed.marrs123=[email protected]>
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>
Re: DQ10 Woofer Distortion

 

开云体育

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.?


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>
Re: DQ10 Woofer Distortion

 

开云体育

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 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.? ??
Re: Alon IV dq 20 replica

 
Edited

One56Way was Jon’s next door neighbor. I was able to hunt her down from a msg she posted on a forum. Finally found her through Etsy. She also owns or runs a Gentleman’s club on Long Island I think. She is a nice lady. Her email is imbedded in one of my previous msgs.
I suppose if one lived on or near Long Island they could possibly locate Jon and visit him in assisted living. Given a proper introduction he could very well enjoy it.?

My wife does genealogy. I can’t tell you how many times she has said she wished she had a chance to talk to old timers before they passed.
Re: Alon IV dq 20 replica

 

Thanks for this information. My first exposure to the 10's was in high school and I saved every nickel to buy a pair. Many years pass....but when I heard about the back story of Jon it stuck with me. Such an interesting "character" and pioneer in audio, struck down so dramatically (at arguably what might have been his career his peak). And then decades of silence as to his situation, state of function and whereabouts. It all just added to the fascination and desire for answers. I had always hoped he'd re-emerge, limited by whatever physical capabilities of course, to acknowledge those who love his designs and want the story behind them.? To be gifted his personal pair of 10"s - absolutely amazing!!! I don't suppose you got a photo of the two of you? Did you find him to be "eccentric" or just a cranky old man? The fact he "lit up" when you mentioned his speakers suggests to me he was still very much oriented and ready to chat, but I could be wrong.
?
Curious - who is "One56Way" and their connection to Jon?
?
I guess this matter is closed since he's in assisted living. Sad to ponder. Almost has a James Dean/Steve Jobs aspect to it.
?
Sending same response to Charlie since he has background on this too.
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