Jump to content

DQ-10 Crossover Rebuild - ready to solder - Help!


Recommended Posts

Hello all!

I restored the woofers on a pair of goodwill dahlquit DQ-10s and have enjoyed them for about 2 years. I finally got the gumption up to rebuild the crossovers from scratch using some serious components. I am a total novice on electronic circuits, but have a basic understanding of how to read a circuit and soldering. 

As of now I have glued all the components in place and would love any commentary about fixing it all in place with the solder. Attached are progress and the schematics I've run through trying to put this together. I'll add a bill of parts tomorrow and some labels. 


Here is a link to the progress and originals. You will see the woofer and mid woofer circuits are on a separate board as the mid, tweeter and supertweeter:



Thanks for any help!!!!


DQ10 CO schematic.jpg

DQ10 CO schematic2.jpg






Link to comment
Share on other sites

Here's the bill of materials. I've updated the attached photos to include the assignments for the components:


Part Number Description Qty Units Price Total Xover Part
260-194  Black Perforated Large Hole Crossover Board Pair 5" x 7" 2 Pair $4.80 $9.60 Board
027-124 Audyn Cap Q4 82uF 400V MKP Foil Capacitor 2 EA $19.62 $39.24 C1
027-578 Solen 16uF 400V Polypropylene Capacitor 2 EA $9.29 $18.58 C2
027-117 Audyn Cap Q4 8.2uF 400V MKP Foil Capacitor 2 EA $4.06 $8.12 C3
027-236 Dayton Audio PMPC-6.2 6.2uF 250V Precision Audio Capacitor 4 EA $4.93 $19.72 C4/C5
027-238 Dayton Audio PMPC-6.8 6.8uF 250V Precision Audio Capacitor 2 EA $5.19 $10.38 C6
027-900 Jantzen 0200 0.10uF 400V Crosscap Capacitor 2 EA $1.20 $2.40 C7
027-462 Jantzen 0506 0.15uF 1200V Z-Superior Capacitor 2 EA $10.84 $21.68 C8
255-424 Jantzen Audio 1.2mH 15 AWG Air Core Inductor Crossover Coil 4 EA $16.39 $65.56 L1/L2
255-418 Jantzen Audio 0.82mH 15 AWG Air Core Inductor Crossover Coil 2 EA $14.06 $28.12 L3
255-024 Jantzen Audio 0.20mH 20 AWG Air Core Inductor Crossover Coil 2 EA $5.25 $10.50 L4
255-036 Jantzen Audio 0.50mH 20 AWG Air Core Inductor Crossover Coil 2 EA $6.40 $12.80 L5
017-4 4 Ohm 20W Resistor Wire Wound 4 EA $0.98 $3.92 R1A/R1B
015-4 4 Ohm 5W Resistor Wire Wound 5% Tolerance 2 EA $0.48 $0.96 R2
016-5.6 5.6 Ohm 10W Resistor Wire Wound 5% Tolerance 2 EA $0.64 $1.28 R3
015-5 5 Ohm 5W Resistor Wire Wound 5% Tolerance 2 EA $0.48 $0.96 R4
015-3 3 Ohm 5W Resistor Wire Wound 5% Tolerance 2 EA $0.48 $0.96 R5
004-30 Dayton Audio DNR-30 30 Ohm 10W Precision Audio Grade Resistor 2 EA $1.38 $2.76 R7
Link to comment
Share on other sites

  • 4 weeks later...

Welcome to CSP buzuddha and Jeffh!

There don't seem to be a lot of Dahlquist guys here so you may not get a lot of feedback but keep trying!

Buz, that's a fantastic GW find and your new crossovers look fantastic! Very neat and professional work. I don't really understand your question; 

On 1/22/2017 at 11:04 PM, buzuddha said:

would love any commentary about fixing it all in place with the solder.

Just twist the leads together according to the schematic and solder? Your skill level seems high so I'm unsure what you are asking.


Link to comment
Share on other sites

  • 2 weeks later...

These turned out great!

I was asking for feedback because this was literally the first time I've ever soldered anything together. Had to go through and triple check all the connections.

I didn't get any feedback so I said "screw it", and jumped right in. The speakers sound incredible. The treble control knob on the back now has a very noticeable effect on the sound. Also, I would say the speakers are sounding great, but I changed out my preamp at the same time as the crossovers, so it's hard to know what is due to what. But in total everything sounds great now.


Link to comment
Share on other sites

  • 2 months later...

You put some real effort in your crossover rebuild and used good quality parts!  I am in the process of rebuilding a dq10 crossover.  I was going to replace all parts with better quality parts but ran into a snag.  As I was measuring the inductors with an ohmmeter I noticed that some intentionally had high resistance, by design.  The inductor on the super tweeter was extremely fine wire and measured around 6-7 ohms.  If I replaced it with the a new inductor of the smallest gauge wire available it would be less than 1 ohm.  This would change the balance and sound of the speaker.  I decided to use the original inductors as they all have the correct DCR.  I am replacing all capacitors and haven't decided if I will replace the resistors yet.  The inductance in the original resistors could be different than what is available today.  This project is not as easy as it looks.

Link to comment
Share on other sites

  • 11 months later...

Picking up this thread again one year later. 

Randy, probably a good idea to measure the original components for their properties. So I got to thinking, I've already replaced the crossovers, why not replace the drivers too. 

I know there are recommended drivers that are most like the originals, but I've changed up the crossover at this point and they may not emulate the originals exactly. Perhaps a particular woofer or tweeter is a better fit than those recommended for the original crossover. Is there a technique to determine the appropriate replacement drivers for a given crossover output by running a tone into the crossover and then measuring what comes out at any given driver lead?

Link to comment
Share on other sites

  • 8 months later...
  • 5 months later...

Hello Buzuddha

I recently bought in a pawn shop a pair of DQ 10.the drivers were wery "tired" rubber suspention thorn apart end dust contamination.listening to them for 3-4 fours i decided to sent all the drivers to a specialized shop for "renovation".

But problems were not near to be solved...after repositioned and solderd the speackers were still far form being impressiv...so i think i'll need to rebuild the crossovers.

As i am living in France for some time now..i was not able to find all the components on your list(or some not the same specification).

Could you please indicate me your suplyer for the in usa,maybe i'll could buy all your list..that you have so generously shered(even the parts numbers)

I have to mention that i am not  working at all in the electronic field but seeing the week documented schematisc and photos with your work in progres,having basics trainig in electronics(phisics) aquired in the college 25 years ago...i would like to try building them myself as a weeckend hobby project.

Please shere with us the link to yours suplyers site.

Excuse my orthographic falts..i am not a nattive english spoker.



Link to comment
Share on other sites

  • 2 weeks later...
  • 4 months later...
3 hours ago, DoctorBongo said:

I have been schlepping around a pair of DQ-10s for a decade or so.  Haven't done anything with them.  I'm reasonably adroit but definitely not electrically tech savvy.  Does anyone construct and sell upgraded crossovers?

You can send them to Regnar. I am told they do good work, but they are very expensive.

If you send the crossovers to be rebuilt, you will still need to deal with all the wires and connections to the speakers and input terminals. That is nearly as much work as rebuilding the crossovers alone.

I bought one of the Regnar kits with capacitors and upgraded wiring. It was still expensive, but I paid for the minimal hassle of sourcing parts and their easy directions. I think it was worth it. My DQ-10s sound better than ever now.

Link to comment
Share on other sites

  • 11 months later...
  • 1 year later...

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Create New...