ragtopolds6
Active Member
I think woofers were switched.. Not sure square magnet on back... Are these newer version woofers... And are the mirrior
Dahlquist dq 10.. My find this morning... Maybe a little help from; the elders
- Thread starter ragtopolds6
- Start date
ragtopolds6
Active Member
rudedogg
AK Member
Nice find! Those have been refoamed at the least, the original foam was inverted. That may be somebodys idea of an upgrade. My woofers have the masonite rings as in Advents. And the foams roll inward. To me, it looks some work has been done to the Xovers, but i am not sure of the complete evolution of the DQ-10. Your pair are not mirror imaged, but if you wanted to make them so,it would not be very difficult. How do they sound? I absolutely love my set.
ragtopolds6
Active Member
Well just found both piezo tweeters are not working.. Have to research further
ragtopolds6
Active Member
Yes.. I thought they should have the advent woofer... They sound great except for the tweeter. Which should be a easy fix.. And if I wanted advent woofers that would be easy to get also.. Well see what happens.. How about a nicer tweeter in there maybe..
MATT0404
Well-Known Member
You should probably test them with a multimeter to determine if they're working or not. If I remember correctly, they only operate above 12-15 khz, and it's very difficult to tell if they're actually working just by listening.
rudedogg
AK Member
Those piezos are crossed over very high, they may be working as they are hard to hear and don't seem to play in every song...here is my xover...newer version i suspect...
Blue Shadow
Waiting for Vintage Gear from this century
What you have is serial number 000128 and that speaker looks great for its age. The woofer is not the one commonly found in the DQ-10 that is the advent masonite woofer, easily found on the bay as are proper surrounds if they need that and looneytunes2001 can supply them.
You have original crossover electrolytic caps and most would replace all but the 80µF cap (one between the coil and the two resistors upper right) with film caps and freddymac2 insists you use a film cap for that one, too.
Heck even the wiring looks unmessed-around-with. Do you have a serial number sticker on the other speaker?
A full rebuild is in order for these to be their best but you can just get them up and running right with new caps and see what they sound like. With a speaker that early in the production, I don't know about the woofer and its originality but suspect it is a simple 12" woofer to plug a 12" hole. The Advent-style woofer used in these was a 10" driver in a 12" basket to allow a long excursion.
You just collecting or are you going to be rebuilding these to allow them to take their place in, is that your, museum? Check out the Dahlquist Yahoo Site lots of paperwork to learn.
Sure would be good to be full information on that crossover since it seems so original and the schematic on the web is for s/n: 4300 and up or so. The later speakers added a tweeter fuse.
Guys are right the piezo doesn't start til about 12k and if you think it doesn't work because you can't hear it that is probably ok. I didn't hear mine either but when Steve had his computer over here doing some frequency work, third octave, I saw the super tweeter doing its work.
You have original crossover electrolytic caps and most would replace all but the 80µF cap (one between the coil and the two resistors upper right) with film caps and freddymac2 insists you use a film cap for that one, too.
Heck even the wiring looks unmessed-around-with. Do you have a serial number sticker on the other speaker?
A full rebuild is in order for these to be their best but you can just get them up and running right with new caps and see what they sound like. With a speaker that early in the production, I don't know about the woofer and its originality but suspect it is a simple 12" woofer to plug a 12" hole. The Advent-style woofer used in these was a 10" driver in a 12" basket to allow a long excursion.
You just collecting or are you going to be rebuilding these to allow them to take their place in, is that your, museum? Check out the Dahlquist Yahoo Site lots of paperwork to learn.
Sure would be good to be full information on that crossover since it seems so original and the schematic on the web is for s/n: 4300 and up or so. The later speakers added a tweeter fuse.
Guys are right the piezo doesn't start til about 12k and if you think it doesn't work because you can't hear it that is probably ok. I didn't hear mine either but when Steve had his computer over here doing some frequency work, third octave, I saw the super tweeter doing its work.
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swechsler
Frog Whisperer
Piezo tweeters have a very high impedance, testing with a DMM may be of limited usefulness.
rudedogg
AK Member
Ok, i just now did this to test my piezo tweets. Dont know how safe this is but...I set my preamp to an unused source, not phono. I turned down all parametric eq settings except the 10k knob on my Mc pre..which i turned fully clockwise. I then turned the volume all the way up on my preamp. If you just have bass and treble, turn down the bass, crank the treble! NO SOURCE please! Like this , i get a faint hiss from domes, and an even smaller hiss from the piezos..i used a red solo cup minus the bottom to listen...so they are surely passing signal, albeit somewhat tough to hear with my 53 year old ears..if you do this, be very careful not to amplify anything! And be careful not to pass any static electricity if your knobs are metal. Any pop or noise at full volume may guarantee a failed piezo.
ragtopolds6
Active Member
blue shadow thanks for the info..lol on the museum...I call it the mad room...it all started about 4 years ago with a cer diagnosis...has helped me keep my mind in a good spot...I fix up the cabinets and surrounds flip some keep the better until something better comes along...always rotating ...serial number in 46 digits off other speaker..
ragtopolds6
Active Member
ragtopolds6
Active Member
thanks for info blue shadow..will post picks of woofers..they have a square magnet tuff paper cone with flat attach edge..i think there dahlquist from another model
sqlsavior
Lunatic Member
A technician I worked with way back told me he once plugged that piezo tweeter into a wall outlet, without damaging it.
rudedogg
AK Member
How did it sound?
ragtopolds6
Active Member
what that sounds crazy..
ragtopolds6
Active Member
ragtopolds6
Active Member
Can anyone name the speaker...
