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Re: DQ20 tweeter

 

I have at least one SEAS MCA15RCY and they are very similar but with the SEAS built on a much nicer cast frame.
Both have treated paper cones of about 3.5" to the start of the roll.
Both have about the same width roll.
Both have treated fabric dust caps.
The Vifa has 1mm linear throw and the SEAS 1.7mm
The spec sensitivity is a bit less for the SEAS, about 2dB which IS significant, perhaps the resistive padding
could be adjusted and the rest of the components impedance scaled to bring the XO response back in spec
but with a bit more drive.? There's 2.7 ohms in series with the stock Vifa mid.
I measured the stock Vifa as 5.7 and 5.8 ohms and the SEAS is rated at 5.8 ohms, how about that?

Unfortunate that the cutout is 4 1/8" but the SEAS needs 4 1/2", I'd like to try the SEAS with the option to go back
if I find originals on ebay, however we must keep in mind that the edges harden so perhaps there's no going back.
The Vifa frame is 5" across the smallest side and if the 4.5" cut is made carefully there's 1/8" left for a good seal.

It would be nice to have a high quality modern replacement.? The SEAS are not cheap!

Pete B.

?

On Fri, Feb 21, 2025 at 9:50?AM Mickey McAuliff via <mickeymcauliff=[email protected]> wrote:

I think I looked at that one too! Crap...I've looked and converted so many mm to inches, I can't remember anymore! Lol. Very nice! Let me know how it works if you pull the trigger. I really like the group...but I find it is more of a DQ 10 focused. I may be wrong, but happy to have found someone as interested in the 20's. Mick


On Fri, Feb 21, 2025, 6:42?AM Pete B via <pete.basel=[email protected]> wrote:
Pretty sure that the original was 5.25" and it was a true midrange with short throw and fairly
high sensitivity.? I'm considering this one, because of many similarities - not sure if it will drop right in:




On Fri, Feb 21, 2025 at 9:24?AM Mickey McAuliff via <mickeymcauliff=[email protected]> wrote:


On Fri, Feb 21, 2025, 5:44?AM Pete B via <pete.basel=[email protected]> wrote:
Which mids are you getting?

These DQ20i s are at our house in Stamford CT and I had the drivers at our home in Trumbull where
my measurement equipment is.? The Trumbull home burnt down and most of the drivers are destroyed.
I have Large Advent woofers that will work and will probably buy the modern tweeter and have a modern
midrange in mind.

Pete Basel

On Fri, Feb 21, 2025 at 5:46?AM Mickey McAuliff via <mickeymcauliff=[email protected]> wrote:

Pete. Thanks for your reply. Madisound squared me away on polarity.? I have so far replaced the woofer and tweeter and ordered mids from Josh at Madisound yesterday. I'm not so much of a purist when it comes to the DQ20'S...meaning everything doesn't have to be exactly the same. I'm a lover of fantastic sound and also very in tune visually with the Dahlquist DQ20.? I think we may be Friends because of the Dahlquist.
Thanks again. Mick


On Thu, Feb 20, 2025, 4:19?PM Pete B via <pete.basel=[email protected]> wrote:
I recently purchased a very clean pair of DQ20i s and am in the process of restoring them.
Woofers were recently done by Miller Sound by PO.
And I'm carefully documenting them on Audio Karma, and correcting the schematic that is
available online.? Taking the red dot on the original tweeters as?+, yes the black/green wire goes to the?+
and the black/white goes to the -.
System documented here (not done):

Mids and edge hardening documented here:

Pete Basel



On Fri, Feb 14, 2025 at 7:26?PM Mickey McAuliff via <mickeymcauliff=[email protected]> wrote:
Fellas. Can you tell me the polarity of the Scanspeak tweeter. Black/white, green/black. Which is which? The back label is gone where I assumed the +/- was located. Got my new ones today and didn't want to fudge it up. Thanks Mick
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