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I just purchased my 1st set of DQ-10s. I have serial numbers 000296 and 000298.? Speakers are all original and in very good shape except for large drivers need re-foamed. I am trying to find out what speaker I have for right kit. Is there a database or registry that you can lookup this information to find out what components were used in this build and the build date? Thanks!
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Yours are a very early set, the second or third oldest pair in the group that I'm aware of, so that's very cool. Your pair will have been built the summer of 1973. For the timeline, we've a group wiki on the left that has what information could be sourced and verified.
Timeline:?/g/DahlquistSpeakers/wiki/23985
Your revision:?/g/DahlquistSpeakers/wiki/23605
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As for the woofers, yours would have had the early 10" CTS stock, but they may have gone back to the dealership for upgrading to the new Advent style woofer when that came out. You'll need to check your woofers to see which they are. The surrounds for the Advent style are the most commonly recommended for DQ-10s, but most likely won't fit the CTS woofer. In which case, the woofers will have to be measured to get the right set ordered for them. (Not difficult when working with an outfit like Simply Speakers, but it is one more step to be aware of.) If yours are the CTS, any pictures you can get of the back would be much appreciated. The wiki is lacking in that as only photos of the front of the drivers have been available thus far. I've been trying to figure out what the specific driver model (numbers printed on the magnet) may have been.
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- John
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On Thu, Nov 25, 2021 at 02:51 PM, John van Son wrote:
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Thanks for the information on build. Here are some photos of the back of my drivers. Thanks, Michael
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Well, shoot, I have some frustrating news for you: those aren't the original woofers nor the correct replacements. The 1056 makes those of Gefco manufacture and, if I'm reading the codes right, those were made in 1988. As fifteen years or so is about right for foam surrounds from that era starting to give out if the conditions weren't the greatest, that'd made sense a prior owner would've swapped them out. As the woofers should have an 8 ohm impedance, I don't have any faith in those being a good parameter match for the originals either. Most likely some prior owner bought whatever fit the hole and called it good; an all too common fate with speakers.
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So, you're now in a bit of a situation. You most likely can't just refoam those and call it good, you need a new set of woofers. Your options are to find someone else with an early pair and see if you can badger them into pulling their drivers to get you the model information you need (I've tried asking unsuccessfully for such information before when building the wiki) or picking up a set of later Advent style woofers and modifying your speakers to work with them. That will require modifying the cabinet and changing the crossover around to match the later schematics. The instructions for the cabinet modification if you wish to pursue that route can be found on pages 35 to 37 in this PDF:?/g/DahlquistSpeakers/files/Service%20Documents/DQ-10/DQ-10CompanyDocuments.pdf
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Sorry I didn't have good news for you on this.
- John
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There was an early set of 10’s sold last yr on eBay that had CTs woofers in them that I took a screenshot shot of . Just need to find it.
On Fri, Nov 26, 2021 at 1:24 PM John van Son < jpvanson@...> wrote: Well, shoot, I have some frustrating news for you: those aren't the original woofers nor the correct replacements. The 1056 makes those of Gefco manufacture and, if I'm reading the codes right, those were made in 1988. As fifteen years or so is about right for foam surrounds from that era starting to give out if the conditions weren't the greatest, that'd made sense a prior owner would've swapped them out. As the woofers should have an 8 ohm impedance, I don't have any faith in those being a good parameter match for the originals either. Most likely some prior owner bought whatever fit the hole and called it good; an all too common fate with speakers.
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So, you're now in a bit of a situation. You most likely can't just refoam those and call it good, you need a new set of woofers. Your options are to find someone else with an early pair and see if you can badger them into pulling their drivers to get you the model information you need (I've tried asking unsuccessfully for such information before when building the wiki) or picking up a set of later Advent style woofers and modifying your speakers to work with them. That will require modifying the cabinet and changing the crossover around to match the later schematics. The instructions for the cabinet modification if you wish to pursue that route can be found on pages 35 to 37 in this PDF:?/g/DahlquistSpeakers/files/Service%20Documents/DQ-10/DQ-10CompanyDocuments.pdf
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Sorry I didn't have good news for you on this.
- John
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Hello, my first post.
I have some dq-10s I bought? used in Berkeley 25 years ago. I had never set them up to use after the first week (too big for the room). I was going to sell them on eBay so I opened them up for the first time to clean off dust etc. and they have a small white paper label glued to the masonite. One is 00154 and the other 00167. I gather from reading this group that is early production, but they also are mirror imaged and have yellow caps when I bought them. I will take them apart and try to look at the woofers, which I think have been refoamed. Also they have one 1.5 inch midrange which is a Regnar replacement. Maybe I can find a stock replacement on eBay.
Anyway after reading the knowledge base of this group I think I will keep them and try to restore to original. I will post pictures soon. thanks.
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Hope you have a 200+ wpc amp.?
Hello, my first post.
I have some dq-10s I bought? used in Berkeley 25 years ago. I had never set them up to use after the first week (too big for the room). I was going to sell them on eBay so I opened them up for the first time to clean off dust etc. and they have a small white paper label glued to the masonite. One is 00154 and the other 00167. I gather from reading this group that is early production, but they also are mirror imaged and have yellow caps when I bought them. I will take them apart and try to look at the woofers, which I think have been refoamed. Also they have one 1.5 inch midrange which is a Regnar replacement. Maybe I can find a stock replacement on eBay.
Anyway after reading the knowledge base of this group I think I will keep them and try to restore to original. I will post pictures soon. thanks.
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Hi? I think you do the right thing to restore the dq10, I sold my first restored pair of DQ10 and I was missing them so much and I have now starded to restored a new pair of DQ10.I have tested à lot of speakers from Magnepan, Martin logan ,Thiel ,spendor,Ouad,Von Schweikert B&W,Whaferdale and many more,but the only speaker I was missing where DQ10. Skickat fr?n min iPad
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23 jan. 2022 kl. 00:37 skrev pernugget@...:
?Hello, my first post.
I have some dq-10s I bought? used in Berkeley 25 years ago. I had never set them up to use after the first week (too big for the room). I was going to sell them on eBay so I opened them up for the first time to clean off dust etc. and they have a small white paper label glued to the masonite. One is 00154 and the other 00167. I gather from reading this group that is early production, but they also are mirror imaged and have yellow caps when I bought them. I will take them apart and try to look at the woofers, which I think have been refoamed. Also they have one 1.5 inch midrange which is a Regnar replacement. Maybe I can find a stock replacement on eBay.
Anyway after reading the knowledge base of this group I think I will keep them and try to restore to original. I will post pictures soon. thanks.
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? Op zo 23 jan. 2022 om 09:00 schreef Leif Thunholm < lthunholm@...>
Hi? I think you do the right thing to restore the dq10, I sold my first restored pair of DQ10 and I was missing them so much and I have now starded to restored a new pair of DQ10.I have tested à lot of speakers from Magnepan, Martin logan ,Thiel ,spendor,Ouad,Von Schweikert B&W,Whaferdale and many more,but the only speaker I was missing where DQ10. Skickat fr?n min iPad ?Hello, my first post.
I have some dq-10s I bought? used in Berkeley 25 years ago. I had never set them up to use after the first week (too big for the room). I was going to sell them on eBay so I opened them up for the first time to clean off dust etc. and they have a small white paper label glued to the masonite. One is 00154 and the other 00167. I gather from reading this group that is early production, but they also are mirror imaged and have yellow caps when I bought them. I will take them apart and try to look at the woofers, which I think have been refoamed. Also they have one 1.5 inch midrange which is a Regnar replacement. Maybe I can find a stock replacement on eBay.
Anyway after reading the knowledge base of this group I think I will keep them and try to restore to original. I will post pictures soon. thanks.
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Those numbers would indicate a VERY early pair, but is there also a number stamped into the "circle" cutout on the back where the inputs and dial are located? If they are that old I would not have expected them to come from the factory mirrored as that happened later in production (after serial #4,***-something I think?). If they have a Regnar upgrade and refoamed woofs then they've definitely been upgraded from original stock. Regardless, enjoy!! Post pics of everything.
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When I worked at Dahlquist during summers of 75 and 76, special order mirror imaging was possible. Some owners sent in speakers for mirror imaging mods. Mylar caps was the big thing back then, also.
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Those numbers would indicate a VERY early pair, but is there also a number stamped into the "circle" cutout on the back where the inputs and dial are located? If they are that old I would not have expected them to come from the factory mirrored as that happened later in production (after serial #4,***-something I think?). If they have a Regnar upgrade and refoamed woofs then they've definitely been upgraded from original stock. Regardless, enjoy!! Post pics of everything.
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Yours are a very early pair. The first two hundred had a significantly different crossover than later revisions while the first 999 had the CTS woofer. In the pictures you posted, the woofer looks to be a fairly recent replacement, possibly with a polypropylene cone. It's not the right one. Yours should have the original CTS that looks like this:?/g/DahlquistSpeakers/wiki/29012
Mirror-imaging DQ-10s was offered by dealers on an independent basis, but not something Dahlquist experimented with internally until 1976 and wasn't a factory option (in factory, at the dealer or via mail order kit) until 1977 after serial number 29093. The yellow polyester caps were introduced after serial number 22000 and were also available as a kit. So, those aren't original in yours and were likely changed after the fact. This can be seen in how the one crossover board has been flipped around to be upside down due to the wires not being long enough for the move from its original mounting position.
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The midrange dome looks to be a LPG, which are no longer available. They're good drivers and actually pretty sought after since they were used in some real high end speakers making replacements used or otherwise desirable for those models. That, unfortunately, also means getting a match to the newer driver very difficult. You'd have an easier time matching the extant Mikrofonbau MTL-37 (didn't become Peerless until MB was bought out in 1975) and reverting them to original. That'd be easy to find. The CTS woofers, though, those are difficult. The one set of originals I was able to get the photos on didn't have any markings other than the EIA code for CTS, so it's not known which replacement would work. Opting for the Gefco manufactured Advent-style replacements would be one option, but that would require redoing the crossover and, much more involved, cutting into the cabinet to make it so the larger 12" basket of those will fit.
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Hi John, thanks for your help.
If I acquired a set of advent replacement woofers, I saw on another of your posts a DQ10 PDF reference pgs-35-37 showing bracing alterations, which I could do. (I'm a cabinetmaker). So would there be a schematic of the crossover changes necessary for this to work? Also just to be clear, you are saying that the midrange in the image with the silver ring around it Is possibly an LPG but hard to find ( this is stamped Regnar on the side). and I would be better off replacing both midranges with the Peerless units, or keeping the original I have and getting one more?? And if so, is this still the same crossover setup as with the advent replacements?
Thanks again,
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I seem to remember reading that at some point during production. That the Dahlquist woofer actually has a slightly longer throw than the large Advent. Which allowed for a slightly improved bottom. So are the large Advents actually a correct replacement or just correct visually? Perhaps I'm confusing them with the early CTS's. But I have also run into surrounds that were specific for the Dahlquist and larger than what was specified for the Advents. Years ago I actually bought a pair that I later figured out had the wrong surrounds installed. I replaced them and it did effect the reproduction.
DD
Hi John, thanks for your help.
If I acquired a set of advent replacement woofers, I saw on another of your posts a DQ10 PDF reference pgs-35-37 showing bracing alterations, which I could do. (I'm a cabinetmaker). So would there be a schematic of the crossover changes necessary for this to work? Also just to be clear, you are saying that the midrange in the image with the silver ring around it Is possibly an LPG but hard to find ( this is stamped Regnar on the side). and I would be better off replacing both midranges with the Peerless units, or keeping the original I have and getting one more?? And if so, is this still the same crossover setup as with the advent replacements?
Thanks again,
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Here's the woofer in my large Advents?
I seem to remember reading that at some point during production. That the Dahlquist woofer actually has a slightly longer throw than the large Advent. Which allowed for a slightly improved bottom. So are the large Advents actually a correct replacement or just correct visually? Perhaps I'm confusing them with the early CTS's. But I have also run into surrounds that were specific for the Dahlquist and larger than what was specified for the Advents. Years ago I actually bought a pair that I later figured out had the wrong surrounds installed. I replaced them and it did effect the reproduction.
DD
Hi John, thanks for your help.
If I acquired a set of advent replacement woofers, I saw on another of your posts a DQ10 PDF reference pgs-35-37 showing bracing alterations, which I could do. (I'm a cabinetmaker). So would there be a schematic of the crossover changes necessary for this to work? Also just to be clear, you are saying that the midrange in the image with the silver ring around it Is possibly an LPG but hard to find ( this is stamped Regnar on the side). and I would be better off replacing both midranges with the Peerless units, or keeping the original I have and getting one more?? And if so, is this still the same crossover setup as with the advent replacements?
Thanks again,
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You should be able to, though you'd end up with the equivalent of late production DQ-10s rather than your early set. They'd be the most sonically improved, of course. As for the schematic, you'd want to adopt the one with the last set of revisions that can be found here along with a parts layout to help sort out what goes where:?/g/DahlquistSpeakers/wiki/23560?You'll see that the crossover layout is a bit different and, depending on how up to date the XO was kept with the revisions, how things are wired in the center and top right of the boards may differ, but you can work with what's already there.
The metal dome driver does look to be a LPG, though I can't say which model without seeing the side of the motor and even then it'd be a guess. My guess would be that it's the PMK51, which was quite popular for awhile:
If you go for MB/Peerless replacements, whatever drivers you get will already be decades old and have aged suspensions. So, there's nothing gained by replacing both. Just one will suffice and make it easier to find.
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Re: Advent woofers. Per Jon Bader, Dahlquist's service manager of 15 years, the Dahlquist woofer's biggest difference from the Advent type was that it used a different technique of how the surround was glued along with a different cone treatment that improved its top end performance (outside of the passband for how it's used in Dahlquist models anyways). In our facebook group, a driver designer for Gefco, the manufacturer of the drivers for both Advent and Dahlquist, chimed in recently saying that the voice coil former in the Dahlquist also differed in that it was phosphor bronze, a material used in the 1970s to improve power handling (handled higher temperatures better). These differences are fairly minor at this point given how much the drivers will have aged (again, suspension compliance changes and alters the T/S parameters significantly) and so they can be used interchangeably without notable difference. You do have to refoam either of them correctly or the voice coil won't be centered in the flux in the gap impacting linearity and excursion limits.
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