• Please note that Audiokarma will be offline briefly for updates early on Monday morning, September 28th.

walsh tweeter design/rebuild

Silk.jpg HPIM1060.JPG Jim, here is my first mockup, template is perfect.HPIM1060.JPG What would you think of cutting the silk into strips, still attached to the voice coil and gluing them to the inside of the cone?
 
Last edited:
I'm always striving for oem, I have yet to find the original motor used.
I have rebuilt with several different dome materials that work very well poly,silk, titanium, but always end with aluminum because it looks like the oem and it's not a dead giveaway that's it's been repaired.
Either way a 1" dome is for that cone.
The original design engineers used the cheep readily available tweeters that they could find $9 each
 
I'll look around. As you can guess, I'm gonna do this. I will remove the dome.
Checked out the titanium. It'd be about 20 bucks I'll probably try Parts Express DC28F-8 tweeter. They are 20 bucks apiece, the voice coils are 13 bucks. Mounting plate appears as it might be an issue. If it is I'll split it in half.
 
For this version I used gold paint. It does work, I have measured output. I need to clean up the cabinet a bit and drill mounting screw holes. I have not run a signal generator on it yet, But I do have a product.HPIM1061.JPG
 
What tweeter did you use?
It doesn't look like the Parts Express DC28F-8.
That part number is 1 1/8 in dome.
 
Last edited:
Goldwood Sound 100 Watts 8ohm Silk Dome Speaker Tweeter Black (GT-510)This however was a mistake. The speaker is to insensitive for this application. It was only 17 bucks. So mechanically it was a success. It did work but was not efficient (loud) enough. I'll get something else with a low power rating/ Higher efficiency and try again.
 
James Comer said:
Goldwood Sound 100 Watts 8ohm Silk Dome Speaker Tweeter Black (GT-510)This however was a mistake. The speaker is to insensitive for this application. It was only 17 bucks. So mechanically it was a success. It did work but was not efficient (loud) enough. I'll get something else with a low power rating/ Higher efficiency and try again.
Click to expand...
Specs say 50 watt and 90db. What do you have for a capacitor. 3.5uf Bp or poly?
 
I
James Comer said:
Goldwood Sound 100 Watts 8ohm Silk Dome Speaker Tweeter Black (GT-510)This however was a mistake. The speaker is to insensitive for this application. It was only 17 bucks. So mechanically it was a success. It did work but was not efficient (loud) enough. I'll get something else with a low power rating/ Higher efficiency and try again.
Click to expand...
I think you need to reduce the cone weight to an absolute minimum. Extra mass will tame the output, it will also kill the higher freqs. I'd play a bit with the cone materials, internal dampening, and the top foam before buying more tweeters. Of course a more powerful motor will move the cone easily, but if the cone is too heavy, a small tweeter VC will have problems to make it sound loud. It would be good to have the exact weight of an original cone to compare.
 
I have an original cone, but no gram scale.
Also the original was not loud by any means.
It's purpose was to augment peerless tweeter.
And from the cone, only the last end of the frequency, 10 to 22 k it feels more like a presence then a sound.
When a band member runs their hand across those sparkling tiny chimes they come out strong, but in 360 degrees and fill the air instead of the straight line as main tweeters are more directional.
What about loading a tone sweep into your phone.
And see where it begins to sing.
You may have nailed it and not know it.
 
Last edited:
I have a good signal generator. When something doesn't work the way I expect it, I think about it a couple of days. Right now i'm at, and this is just a thought, haven't thoroughly thought it out, but the foam at the top detached from the center rod and supported by a light spring pushing up from the bottom. The appearance would be the same but the cone would be at zero weight. I haven't given up, this is gonna work edit...and I'm gonna like it.

.
 
Last edited:
The note you made concerning the peerless tweeter keeps coming back to haunt me.. "It's purpose was to augment peerless tweeter." Well I don't have the Peerless tweeters. What is in there is Pyles and they do sound good, However I have ordered 1" Silk Dome Peerless Style K010DT Tweeter, Polk, ADS, Cizek, Others, 8 ohms, T-K010DT. Your point is taken.
 
In general here is a list of replacement parts I have used in these Monitor 2 A's. I checked out the components in the crossovers and replaced anything defective......
HiVi DMB-A 2" Fabric Dome Midrange abt 25 bucks
HiVi
Part #297-716
Model: DMB-A
This looks good but it's round not square.
GRS 12SW-4 12" Poly Cone Subwoofer 4 Ohm abt 25 bucks
GRS
Part #292-484
Model: 12SW-4
This is a tight fit but the screws line up
From Amazon
Goldwood Sound 100 Watts 8ohm Silk Dome Speaker Tweeter Black (GT-510) These became walsh tweeters with JimBo's help abt 17 bucks+ R&D about 30 bucks
Electronics-Salon 25W 5 OHM High Power Wirewound Potentiometer, Rheostat, Variable Resistor.
Brand: Electronics-Salon
Price: $18.99 .On the crossover module, there is not enough room to use 2 of these on both the tweeter and midrange circuits. This I used on the midrange circuit. the tweeter pot was not defective.
Style: 5 OHM
FromSimplySpeakers

1" Silk Dome Peerless Style K010DT Tweeters $49.95

This will get them working and they do sound pretty good. About $150 a peice. Think about it. Almost all of the drivers and speakers that came in these originally failed. There is a reason for that. The 5 watt pots in the midrange circuit were woefully inadequate and were replaced with 25 watt in latter models. They were using as cheap of components as they could find and engineering around them. Same thing I did, but I tried to match the originals, at least in Impedance, instead of engineering the crossover..When the Peerless Style Speakers come in I'll Post pictures...JimBo Convinced me that my Walshes are good enough. I 'll run a scan on them in 1 k increments after I get the Peerless Style speakers.
 
This is true Jimbo. Just the crossover and the cabinets. Point is they do, with your help, sound good. You were right about the walsh knockoff's. They affect /effect the "image". With 2 of them operating it becomes crystal clear what you were talking about. I have made 2 of these you have made several, I'm sure your results are even more dramatic. It's like the difference between Hancock President's Reserve and Old Rip Van Winkle, or Chivas Regal and Royal Salute, or Courvoisier VSOP and XO, or Bud light and Königsbacher Pilsener. I have and will drink all of them but do appreciate the quality. Thanks for the help I am indebted to you.
.
 
You must log in or register to reply here.
Back
Top Bottom