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Multi-Way Conventional loudspeakers with crossovers

Dahlquist DQ-10 flashback
Dahlquist DQ-10 flashback
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Old 10th October 2011, 11:53 PM   #41
scott wurcer is offline scott wurcer  United States
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Dahlquist DQ-10 flashback
I still miss my DQ-10's warts and all.
"The question of who is right and who is wrong has seemed to me always too small to be worth a moment's thought, while the question of what is right and what is wrong has seemed all-important."
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Old 11th October 2011, 12:49 AM   #42
Mr. dB is offline Mr. dB  United States
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Originally Posted by andersonpaulb View Post
I believe the dq 10 woof was nominal 8 ohms vs 4 ohms for the advent. Not the saame thing.
I believe this is correct. Advent and Dahlquist may have bought the components for their woofers from the same source, but they're not completely identical.
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Old 11th October 2011, 01:34 AM   #43
kevinahcc20 is online now kevinahcc20  United States
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Had two friends in the mid/late-70's...one with DQ10's driven by Luxman electronics and the other with Mag Tympanis driven by GAS gear. Despite extensive c. sativa fueled attempts to identify a winner we could only conclude that both were very, very good!
Kevin(ahcc20)...I'd rather have a bottle in front of me than a frontal lobotomy!
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Old 12th October 2011, 11:26 PM   #44
Dq10cloner is offline Dq10cloner  United States
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In reply to Anderson, you are right they were 8 ohms which is a difference between 4. I am using 8 ohm drivers (JBL), just to let you know, and they are an 8 inch rather than a 10 inch. I have kept the same array though. And I was going to post my capacitor, resistor and inductor values but have decided not to, due to the feedback from other people wanting to buy the ones I have created. I have figured out after trial and error how to tone down the piezo tweeter so it's not so harsh and actually pleasant to hear. Hard to believe but I did it. The midrange is outstanding! The sound image is incredible. Its hard to explain how good it sounds, but your ears don't lie to you. I can't believe I made something that sounds so good. Ive demo'ed them on descent and pristine amps from kenwood to McIntosh, tube and solid state. They are a dream come true. I would be glad to demo them to you if you're ever in Pismo Beach, CA. Let me know. In the future I plan to make more and sell them on line. It'll take a few years for me to get my business going but I'm working on it already. Plus I'm building altec 210 split cabs and smith horns.
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Old 5th December 2012, 01:05 AM   #45
scottiesharpe is offline scottiesharpe
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I have a pair of stacked DQ10's on stands which I designed and made myself. I'm driving them with a Phase Linear 400, but you are right in supposing it's not enough power. Looking for a larger amp, or a second PL400 to augment the juice. Sound is airy, transparent. Vocals, woodwinds and horns are in the room with you. Not the best speakers to jam out to with loud rock or special effects (I've blown the woofers more than once getting into albums such as The Wall or even early Steely Dan.) These speakers have the uncanny ability to make you think you are listening to a new mix down of songs you've heard hundreds of times on conventional speaker systems. You'll hear stuff you've never heard before, such as shakers, synthesizers, echos, musicians breathing and so forth....)

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Old 19th May 2013, 07:40 AM   #46
tkollen is offline tkollen  United States
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Since I started with the audio hobby in the early seventies I have gone through at most at least thirty speaker systems, many of them built by myself, horn systems, most well known systems such as Quad, DQ10, Magnepans, Wilson, Infinity, you name it. Out of all systems I have had I kept the Dahlquist DQ10's and they quickly became my favorite speakers and for me a lifelong hobby. It's now been more than thirty years and counting and I am still improving and tweaking my system.

My speakers were already mirror imaged and my first mod was to replace all mylar caps with polypropylene caps, better wiring, better damping material, bracing the box, bypassing the fuse etc.

My second mod was to buy the Sequerra HF-1 ribbon tweeters (highpass at 3.5 KHz, 24 dB filter), especially designed for DQ10 and to be mounted on top of the grille. In the process I disconnected the Motorola super tweeter and the Peerless tweeter. This mod made an already great speaker substantially better, the sound became more spacious, dynamics improved and the highs substantially better.

My next step was to find a midrange dome that could replace the mediocre 1.5" Perless midrange driver. Over time I went through at least 20 candidates I could find on the market. Finally I found the perfect replacement, the Dynaudio D54 2" dome midrange. Since its frequency range is shorter than the Peerless midrange I had to mate it with a ScanSpeak tweeter (took me a few years to find ) to make the transition to the ribbon tweeter seamless. This replacement required designing a new crossover to make the system sound right. My home audio laboratory with a computerized Clio measurement system and a crossover optimization system was here a great help but finally many hours of listening was required to make it sound right. This step took more than 15 years to realize.

At the moment I am trying to find a better alternative to the cheap 5" Philips Mid-Woofer. Although I have experimented with many better sounding drivers with less distortion and more dynamic range I have yet to find another driver that I can integrate into the system seamlessly, even with a redesign of the crossover.

The system has now a huge and expansive sound field (both width and depth), instruments and voices are projected at the proper height and with pinpoint accuracy. Voices sound natural and transparancy rivals most electrostatic systems. At this point my DQ10 system, including Entec subwoofers, is my favorite system of all times and I have yet to find anything that comes close.
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Old 19th May 2013, 03:16 PM   #47
Salas is offline Salas  Greece
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Dahlquist DQ-10 flashback
Nice. Have you got any pictures?
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Old 19th May 2013, 04:15 PM   #48
pcb121055 is offline pcb121055  United States
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This is an exciting thread for me. I sold Dahlquist in the early 80's. I owned a pair of DQ-10s and powered them with a Hafler DH-500 and that worked well. I sold them off for financial reasons after about two years and have missed them since. I guess the challenge in my mind is the huge number of raw drivers that might be candidates. There were more expensive drivers available then too but Dahlquist chose THOSE. A Motorola Piezo? Really? End result was that they sounded great to me. Truthfully, this sounds like a great project, using... scratch that... REQUIRING every tool available to the DIYer to optimize. A great learning exercise. Thanks for bringing this up
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Old 27th June 2014, 02:30 AM   #49
duc359 is offline duc359  United States
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In case this topic is of interest still:

The best amp I ever tried on them was the Threshold Stasis-3. Beat various Haflers, Dynaco's, Ampzilla's of the time. Also a JVC-UA tone arm with a FR-3Mk1 cartridge on an Oracle, I had a mod'd PS Audio pre-amp and FR step up to start, and an ARC SP-15 with a Carniegie cartridge later.

I ended up building new woofer cabinets with the woofer along the top edge, volume equal to the old box, crossover and wiring external, and lined up the drivers vertically using metal mounts over the boards they were mounted on. I understood the idea behind that alignment and the boards, but believe me they voiced much better vertically, and nearly naked.

I had to realign the voice coil to one of the low mid drivers. replace the cheap old caps with Solen's (better at that time).

I did replace the piezo with a JVC ribbon for much sweeter softer treble.

I had actually cut down the grill covers to retain the style over the thinner facing of the woofer. I also got rid of the metal screening, and cut down the wood so the drivers could breathe to the side.

Obviously I spent years and dollars, but learned a lot. Much more recently made a pair of Triangle Celius 202's from annoying to excellent, rebuilt a pair of Pro Ac Tablette II's
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