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Finally! DQ-10s in da house!

Pellets look like those for a stove. I don't remember any leaking bags in the barn though. Could have happened when my wife put them in the back of the van. Could also be hay stretcher for the horse. The person who gave them to me had a wood stove, so that probably rules out the basement storage for the last several years.
As for the fuses, I think I replaced one or two when they were here.
 
baco99 said:
here's what i think happened to that resistor: someone hooked these up to an amp showing a higher than normal DC output. the resistor got hot as it is part of the woofer/midwoofer circuit which theoretically required more power to reach a prescribed volume. The combination of those things cause the resistor to heat up, and given its proximity to the adjacent capacitor, caused the cap to heat up, expand, and burn through. that cause a chain reaction whereby the whole circuit overheated and next weakest link, the think gauge coils, fused together.

Ironically through all this, all of the fuses were in tact. And they seemingly protected the tweeter and sweeter circuits.

just a theory.

So, we'll see.
Click to expand...

Your theory, if I understand it (and, frankly, I don't) is that the fuses were intended to protect the speaker, and it's various components, from 'overloads' originating from the outside, but not from anything occurring once past the furses and inside the speaker? Interesting.

Question. Did the speaker protection circuitry fail? Work? Or work as intended?
 
mousepotato said:
Your theory, if I understand it (and, frankly, I don't) is that the fuses were intended to protect the speaker, and it's various components, from 'overloads' originating from the outside, but not from anything occurring once past the furses and inside the speaker? Interesting.

Question. Did the speaker protection circuitry fail? Work? Or work as intended?
Click to expand...


I dunno!


Todd's saying that he replaced some fuses when he owned them, which throws part of my theory out the window.

If you have any ideas, I'm curious to hear them
 
Everything's looking great. :thmbsp: The pellets remind me of a certain type of cat litter that is made from recycled newspapers.
 
apparently Dynamat doesn't like to stick to masonite like it does to metal.

{goes and gets staple gun}
 
comparison photos of the side rails. one is sanded and has one coat of tung oil applied. the other unrestored.

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I have owned and loved DQ 10's since the late 70's. I remember that my local Dahlquist dealer got two pair in for repair in 1979 that the crossovers were completely
melted but the fuses had not blown. They found out that these DQ 10's were used
in a Disco driven by BGW amps crossed over to Cerwin Vega Earthquake subs.

Hard to believe someone would install them in a club/disco setting!
 
i had a pair sounded nice 150wpc was not enuff power lol.

now i run a maggie 9302 an open baffle speakers. sound just as good imho.

have fun Don P
 
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i have 300w on tap, so no problems there!

more progress. the screens are DONE!

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Boxes are getting a respray. Dynamat installed on both.

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The vinyl contact paper was lifting on the bottom of the cabs. I debated whether to remove and paint with a Textured paint, remove and replace, or repair. I chose option C. The repair was made possible by a heat gun and some left over speaker surround adhesive. I brushed on the adhesive around the areas that were lifting, then carefully applied heat from the heat gun. This did 2 things: 1) if caused the stretched out plastic contact paper to shrink back to its normal shape, and 2) it caused the glue to dry super fast. Some areas will need some touch up paint, but overall I am very happy with the repair.

one more coat of flat black on the rest of the cabs and I can wire in the woofers, fuses, and the new pots.

Hoping to get these fired up before the end of the long weekend!
 
baco99 said:
apparently Dynamat doesn't like to stick to masonite like it does to metal.

{goes and gets staple gun}
Click to expand...

If its not actually sticking I can't imagine its doing much good.

It's intended to ad mass to what it sticks to across the entire surface.

Spray a coat of 77 or other adhesive on the MDF first.

Good luck. They look great.

Eric
 
UPDATE:

The Dynamat is sticking now. THe staple gun just helped the edges from curling since the material has been stored in a box for 10+ years.

Well, I got pretty much all of the assembly done. Wired them all up, filled the boxes with fiberfill, and closed em down.

The left speaker is working amazingly well. I haven't had a chance to really wind it up yet, but so far so good. I even wired the tweeter pot correctly! Go me! :D

However, there is a problem, the right midrange dome is not working. I could hear something missing, de-soldered it, checked the driver and no reading on the ohmmeter.
So, I disassembled it and sure enough, the voice coil has detached from the dome and one of the wire tinsels has broken on the *inside* of the dome. (usually it's from the outside).

Thankfully, I already have experience repairing mid range dome tinsels from my Quantum 5 project. I unwound one turn of the tinsel around the VC and checked for continuity and resistance. Reads 3.6 ohm, which is spot on. SO, the VC is good. It just needs to be reassembled. Wish me luck!

Crossovers wired and ready:
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Assembly Process
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Once I finish the mid, all that's left is to wire-tie the wires, attach some 8" table legs to the base, and add the felt padding around the edge of the rear cage.

What a trip!
 
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Nice work. When I got mine someone had already done all of the hard work. Since then I've had to replace a woofer (spider/coil connection completely self destructed from a poor repair) and a tweeter (looked for weeks and have never had anyone identify whose dome tweeter that is nor the T/S parameters for it so I literally started replacing it with various tweeters I had on hand ..... vifas / seas / dayton ...and an early 90's Chinese knock off of a philips (ad0160 I think) tweeter .... the Philips sounded best so its in there for good now (no way am I paying what some DQ10 "specialists" want for an original !!).
They are in a room that is 20 x 36 with a 25' peaked ceiling and they sound awesome .... a heavily modded PL400 amp drives them and they fill the volume beautifully ...... I tried to ignore the lack of bass for 2 years and finally sprung for a pr of PSB Alpha 3 subs that sit under each DQ10 ....now I am in heaven

A good twelve string recording sounds real on them

So my experience in a nutshell is they deserve their reputation for :
-being power hogs
-amazing imaging and clarity
-the need for something to go down to those last few octaves to help them out
 
I have a much smaller room, so I think I'm fine without the sub. But the wife will want these gone, most likely. Will test them out thoroughly and bring them to the SweatFest in July.
 
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