Re: Randall Research modified DQ-10s
Already started the album here. I just added the second set of pictures of another pair. ?Be glad to post more photos if requested. ?
|
Re: Randall Research modified DQ-10s
Post photos to a Goolge album or add here so we can see them without going to AudioKarma
|
Re: Randall Research modified DQ-10s
I have started a photo album to show the pictures that are behind the ak membership in the first post of this thread. ?I’ll review photos I have and add more.?
|
Re: Randall Research modified DQ-10s
Posted on audiokarma but thought it should be posted here for the info it can bring to the group. The long story, enjoy, maybe not necessary for the site but I am not going to be typing all that again.?
|
Randall Research modified DQ-10s
I do not know if these were a kit mod or a ‘factory’ mod and don’t know much about what transpired back then.
Got these 18 months ago in tired shape and have been avoiding working on them.
What they were is Dahlquist DQ-10 speakers, non-mirror imaged, film caps with replacement Audax tweeters and JVC replacement supertweeters. The crossovers were also modded with double bypass caps seemingly all around. A 1.0 and 0.1μF added to most caps. The 80μF ‘lytic for the midwoofer still original.
As received, these had dirty original grille cloth, a cracked chunk of hardboard for the dome midrange on one speaker and missing fuse holder caps. I pulled the midrange tweeter superstructure to fix the hardboard. Removed the grille cloth and shelved the project for other work because I knew I was going to mirror-image this pair and this repaired structure would be on the other side of the cabinet. Did my homework on these and found . There is not a lot about this upgrade because it was before the internet era.
Tomek is very interested in knowing how they sound so I finally agreed to work on them in Feb. Finished them for listening, not cosmetics, replacing the ‘lytic in the one I was mirroring.
Hooked em up and they are bright. Turned the tweeter control down and invited the boys over for a listen. and his copilot Terry dropped by for this listening, comparing my DQ-10s restored just like the pair I sold to Terry a couple years ago and these Randall Research DQ-10s. We also were going to audition some MM cartridges as Mark is loving his micro ridge retipped XSV-3000 Pickering. Has the power sound for good rock and roll. More on that in TT forum later.
Back to our day of listening. The RRs sounded bad with blurred sound and less bass. They made my 10s sound special. Talked about the differences and moved to the cartridges. The guys said the rig sounds really good, of course we were playing one of Mark’s favorite female vocalists at the time but it is compromised by the offset nature of the two pair of speakers being switched. They have heard double Dahlquist here previously.
The next couple days I was thinking about what F1nut said about bypass caps in the crossover, artifacts and was going to pm him, but he has left ak. I was even thinking that my 10s with polypropylene caps vs Mylar might have an influence. Still thinking about the issues and less bass hit me wrt phase. OK I screwed up and got that wrong. Here is the Crown OC-150a switch box I rarely use but perfect for this chore.
Here is the crossover in the regular DQ-10s. That is a film cap in red on the far end replacing the 80μF ‘lytic cap.
Now that the speakers, all 4 of them are in phase, it sounds good in here. Either pair has clear sound and differences are mostly top end. I need to listen more. Folks hate the Motorola piezo tweeter in the 10s because of reputation, not sound quality in this speaker. Since this horn tweeter will reproduce from a couple thousand to over 20 thousand and it can handle a lot of power it is used in lots of sound reinforcement speakers that just don’t sound that good…bad reputation. In the DQ-10 it crosses over at 12,000Hz and doesn’t screw up the sound as it adds sparkle. But wouldn’t a ribbon tweeter be better? And the dome tweeter can be upgraded, too. Enter the Randal Research mods.
I can switch pairs and the sound is similar, not like Sunday when the RRs were out of phase. I was surprised to hear the damage to the clarity by this simple issue. I had not heard that kind of sonic degradation from OOP before. And I know I’ve listened to speakers wired wrong for short periods of time. Interesting
|
Re: enclosure dimensions of dahlquist DQ10
Is it documented anywhere how there are solid braces above and below the woofer with about a 3" opening to below and above the woofer?? 3" is not exact just roughly what I remember.
If you have a large Advent box it would probably work fine for the bass enclosure.
Pete Basel
Here is the woofer enclosure dimensions. Charlie Conger 713 472 9140 ? Because here in Romania i can't find them. I have all drivers and crossovers, i need only to build the enclosures.
|
Re: enclosure dimensions of dahlquist DQ10
Here is the woofer enclosure dimensions. Charlie Conger 713 472 9140
toggle quoted message
Show quoted text
On Apr 6, 2025, at 9:05?AM, intz87 via groups.io <intz87@...> wrote:
? Because here in Romania i can't find them. I have all drivers and crossovers, i need only to build the enclosures.
|
Re: enclosure dimensions of dahlquist DQ10
Because here in Romania i can't find them. I have all drivers and crossovers, i need only to build the enclosures.
|
eBay seller (Ben) is solid, I buy a lot from him. He's Eastpiont on Audiokarma and he develops a lot of cool vintage audio bits.
When wondering around eBay I found the follow recap kits. They appear to be of high quality and reasonable price. This one is for pair of DQ10.
Although I have no experience with this seller he appears to be legit and the product is as well.
?
|
Thanks a bunch, Mickey!
?
I’ve been shopping at Madisound and Parts Express for as long as they’ve been around. They’re both top-notch. If you need tech support, Madisound is probably the best place to go.
?
I usually don’t recommend eBay, but if you’re careful and know what you’re doing, they can sometimes be a good source.
Solens are good caps though they cost roughly twice as much. For a new design/build with modern high quality drivers
they are probably a better choice.
?
?
|
Just say 'a message for Josh' in the subject line. Please tell him Mick with the DQ20'S sent you here.
Info@...
Please do me a favor and contact Josh at Madisound! He is the most responsive and knowledgeable person in electronic sales I've had the pleasure of doing business with! I sent him the schematic for my Dahlquist DQ20's and he built me a list if everything I needed.? Depending on your price point...he'll help keep you in your budget. I chose all Solens personally. I'll find his direct email and send it in next response.
When wondering around eBay I found the follow recap kits. They appear to be of high quality and reasonable price. This one is for pair of DQ10.
Although I have no experience with this seller he appears to be legit and the product is as well.
?
|
toggle quoted message
Show quoted text
Please do me a favor and contact Josh at Madisound! He is the most responsive and knowledgeable person in electronic sales I've had the pleasure of doing business with! I sent him the schematic for my Dahlquist DQ20's and he built me a list if everything I needed.? Depending on your price point...he'll help keep you in your budget. I chose all Solens personally. I'll find his direct email and send it in next response.
When wondering around eBay I found the follow recap kits. They appear to be of high quality and reasonable price. This one is for pair of DQ10.
Although I have no experience with this seller he appears to be legit and the product is as well.
?
|
Please do me a favor and contact Josh at Madisound! He is the most responsive and knowledgeable person in electronic sales I've had the pleasure of doing business with! I sent him the schematic for my Dahlquist DQ20's and he built me a list if everything I needed.? Depending on your price point...he'll help keep you in your budget. I chose all Solens personally. I'll find his direct email and send it in next response.
When wondering around eBay I found the follow recap kits. They appear to be of high quality and reasonable price. This one is for pair of DQ10.
Although I have no experience with this seller he appears to be legit and the product is as well.
?
|
When wondering around eBay I found the follow recap kits. They appear to be of high quality and reasonable price. This one is for pair of DQ10.
Although I have no experience with this seller he appears to be legit and the product is as well.
?
https://www.ebay.com/sch/i.html?_nkw=dahldq10+recap&_sacat=0&_from=R40&_trksid=p2332490.m570.l1313
|
Hey Charlie! Yes, my brother programmed the router to the size of the supplied gasket. Thinking it's what I wanted. ??♂? no effect on sound stage and I look at it in a positive light..I have flexibility for a different or slightly larger mid if I choose in the future..lol
Looks brand new. I like the way you aligned all the screw heads.
Is it just my perception or is there a wide gap around the midrange driver?
|
Looks brand new. I like the way you aligned all the screw heads.
Is it just my perception or is there a wide gap around the midrange driver?
|
This is how it turned out. Best of luck. Mick
Yes,? I could 3D print a template of any diameter and then no special bearing is needed and it could be? routed all the way through.? Or use a circle jig on the router to make the template.
I've thought about doing it the way that you described, yes that would work.
Pete B.
That should work as long as you can find the right-sized bearings. Guide bushings are also a more flexible option, but you’d need to make a template to route the bigger hole.
When I didn’t have any of these options, I just used a chisel to cut a larger inset and wrapped the driver in Saran wrap and dropped it in the hole. Then I filled the remaining space around the driver with epoxy.? Bondo also works great. I used a belt sander to remove and smooth the excess material. The result was a perfect fit - no gaps at all! In fact, it looked like the driver was part of the front panel.?
|
SpongeSound
Charlie Conger
