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XSD Speaker Crossover and Waveguide GB

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#21
bloqhed said:
GB Status Update

Name / #XO’s (pair) / WG’s (pair) / Country
____________________________________
Bryguy / 1 XO / 1 WG / USA
JHClark / 1 XO / 3 WG / USA
32y0 / 0 XO / 1 WG / Australia
bloqhed / 1 XO / 1 WG / USA / Ordered
Dawa / 1 XO / 1 WG / Sweden
Pinnocchio / 0 XO / 1 WG / Canada
jack_b/ 1XO / 1 WG / USA
veereshai/ 1XO / 1 WG / USA (NoVa)
Click to expand...
JHClark ordered
 
#24
xrk971 said:
This is a group buy for the XSD speaker crossover (XO) and tweeter waveguide discussed here. I think it’s best to keep the original thread for the technical discussion and this for the logistics of the GB. The XSD is 91dB sensitive open baffle dipole speaker with an 8x 6.5in woofer array for bass, a premium 5.25in low distortion high sensitivity midrange and a planar membrane tweeter. It is one of the best sounding speakers I have ever heard. The dynamics are staggering and the distortion is extremely low. You have to be careful how loud you play it because it’s hard to tell how loud it is based on distortion. The dipole nature of the speaker gives it a natural presence that simulates a live band very convincingly. The speaker plays all genres of music well. Especially complex orchestral symphonies and heavy metal that often challenges speakers not capable of nuance or dynamic range. I have voiced it to sound natural and engaging. The midrange level is adjustable through a simple resistor change if you like your vocal presentations more or less forward. The treble is light and airy and since the midrange handles the majority of the telephone band from 500Hz to 5000Hz, the speaker has a coherence and spatial imaging of a point source full range speaker.

The XO Kit will include all the resistor, capacitor, and induxtorcomponents plus a schematic for you to assemble the components to generate a passive XO that provides the following filters at 470Hz and 4700Hz. You will need to follow the dimensioned speaker plans (sketch) which I can provide via email if you PM your request. Note that this is a commercial design so I have been given special permission to provide the XO kits with the requirement that you do not share the schematic or post it publicly.

This is my prototype build:
View attachment 1054788
View attachment 1054772
Renders so you can visualize it in a lighter color scheme. I think satin piano white would be a good look as well:View attachment 1054780
View attachment 1054781
Measured harmonic distortion:
View attachment 1054773
Predi
View attachment 1054774
Impedance is 4ohms nominal but well
View attachment 1054782


I’m also providing a custom CNC’d aluminum waveguide and bezel for the GRS PTT2522-4 tweeter. It has a satin bead blasted black anodized finish. It’s more than cosmetic as it improves the bandwidth extension, lowers distortion, and smooths the output in addition to providing a nice way to mount the tweeter.

The XSD crossover BOM was developed using quality components. All Mills 12W MRA12 non inductive resistors for the mid and tweeter, and 20w non-inductive wirewound 1% Dayton resistors on the woofer shelving filter. Iron core 18ga inductor for the woofer, 18ga air core for the midrange, and 20ga aircore for the tweeter. All capacitors are MKP film (mix of Audyn Q4 and Dayton DPMC) plus one 100uF 400v bipolar electrolytic. You are welcome to upgrade the electrolytic to a film cap on your own if you choose.

The XO will consist of:

6 Mills MRA12 12W resistors
2 Dayton DPR 20W 1% non-inductive resistors
8 Audyn Q4 MKP caps for midrange and tweeter
8 Dayton DPMC MKP caps for midrange and woofer
2 100uF 400v bipolar electrolytic caps for woofer
2 20ga aircore inductors for the tweeter
4 18ga aircore inductors for the midrange
2 18ga ironcore inductors for the woofer

Here is a photo of an earlier crossover with an electrolytic bipolar cap and film cap bypass for the woofer to give you an idea of how I laid things out:
View attachment 1054789
Here is photo of my prototype XO (with some optional upgrades like all film caps for the woofer section) - the quality of the parts on the Kit offered here are as equivalent otherwise and even better since you will receive all non inductive resistors like Mills MRA and the large 20W Dayton for the woofer shelving filter:
View attachment 1054778

I am offering the XSD XO Kit (stereo pair) as group buy or $375 - majority of this is for the cost of the parts and small amount for my effort to assemble the kits. If you want the CNC waveguides, those are an additional $68/pair.

Photos of the waveguide:
View attachment 1054775
View attachment 1054776
View attachment 1054777

This waveguide is also very handy if you want to use this tweeter in another project as it’s a superb tweeter for many applications.

You can have a listen to the speaker here (recorded with my phone):


Here is the GB interest list so far. Please add your name, qnty of XO kits and WG pairs, and country if you are interested.

Shipping is not included and will depend on your location and be auto calculated through my Etsy shop. Typically circa $15 in USA. Overseas will be higher as there 8 inductors and some large film caps plus aluminum waveguides. My guess is circa $35.

Name / #XO’s (pair) / WG’s (pair) / Country
____________________________________
Bryguy / 1 XO / 1 WG / USA
JHClark / 1 XO / 1 WG / USA
32y0 / 0 XO / 1 WG / Australia
bloqhed / 1 XO / 1 WG / USA
Click to expand...
XRK,
In your renderings, above, you do not show the pyrimidal shaped foam on the wings as you have done in your earlier actual photos during the "research" phase of your work. Will the commercial product have this foam as part of its construction too? What is your recommendation for us DIYers?
Thanks in Advance,
JHClark
 
#25
Thank you Jack_b!


GB Status Update

Name / #XO’s (pair) / WG’s (pair) / Country
____________________________________
Bryguy / 1 XO / 1 WG / USA
JHClark / 1 XO / 3 WG / USA / Ordered
32y0 / 0 XO / 1 WG / Australia
bloqhed / 1 XO / 1 WG / USA / Ordered
Dawa / 1 XO / 1 WG / Sweden
Pinnocchio / 0 XO / 1 WG / Canada
jack_b/ 1XO / 1 WG / USA / Ordered
veereshai/ 1XO / 1 WG / USA (NoVa)
 
#26
JHClark said:
XRK,
In your renderings, above, you do not show the pyrimidal shaped foam on the wings as you have done in your earlier actual photos during the "research" phase of your work. Will the commercial product have this foam as part of its construction too? What is your recommendation for us DIYers?
Thanks in Advance,
JHClark
Click to expand...
That was left off as the renders were mainly for purposes of cabinet construction. I would use either the eggcrate or pyramid foam. Whatever you can order for use as sound abatement for wall treatments for sound mixing or recording home studios. Alternatively, 1/2in thick felt works too. Probably the best would be BASF Basotect melamine foam. You can also use many 10cm x 6cm x 2cm magic eraser sponges from China - 100 in a bag for $7. Glue them in place with hot melt. They won’t rot after 10 years like polyurethane foam.
 
Last edited:
#27
Hi Folks,
If you signed up for the interest list, please try to place your pre-orders as soon as possible. I would like to order the parts as soon as possible as parts start becoming unavailable due to the parts shortage we are in right now. Everyday that we wait to lock in the order, is another day we take a chance for an item to go into back order for months.
Thanks,
X
 
#29
xrk971 said:
Thank you Jack_b!


GB Status Update

Name / #XO’s (pair) / WG’s (pair) / Country
____________________________________
Bryguy / 1 XO / 1 WG / USA
JHClark / 1 XO / 3 WG / USA / Ordered
32y0 / 0 XO / 1 WG / Australia
bloqhed / 1 XO / 1 WG / USA / Ordered
Dawa / 1 XO / 1 WG / Sweden
Pinnocchio / 0 XO / 1 WG / Canada
jack_b/ 1XO / 1 WG / USA / Ordered
veereshai/ 1XO / 1 WG / USA (NoVa)
Click to expand...
veereshai ordered.

GB Status Update

Name / #XO’s (pair) / WG’s (pair) / Country
____________________________________
Bryguy / 1 XO / 1 WG / USA
JHClark / 1 XO / 3 WG / USA / Ordered
32y0 / 0 XO / 1 WG / Australia
bloqhed / 1 XO / 1 WG / USA / Ordered
Dawa / 1 XO / 1 WG / Sweden
Pinnocchio / 0 XO / 1 WG / Canada
jack_b/ 1XO / 1 WG / USA / Ordered
veereshai/ 1XO / 1 WG / USA (NoVa) Ordered
 
#31
GB Status Update. Thanks, Bryguy!

Name / #XO’s (pair) / WG’s (pair) / Country
____________________________________
Bryguy / 1 XO / 1 WG / USA / Ordered
JHClark / 1 XO / 3 WG / USA / Ordered
32y0 / 0 XO / 1 WG / Australia
bloqhed / 1 XO / 1 WG / USA / Ordered
Dawa / 1 XO / 1 WG / Sweden
Pinnocchio / 0 XO / 1 WG / Canada
jack_b/ 1XO / 1 WG / USA / Ordered
veereshai/ 1XO / 1 WG / USA (NoVa) Ordered
 
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#32
GB Status Update. Thanks, Bkhatton!

Name / #XO’s (pair) / WG’s (pair) / Country
____________________________________
Bryguy / 1 XO / 1 WG / USA / Ordered
JHClark / 1 XO / 3 WG / USA / Ordered
32y0 / 0 XO / 1 WG / Australia
bloqhed / 1 XO / 1 WG / USA / Ordered
Dawa / 1 XO / 1 WG / Sweden
Pinnocchio / 0 XO / 1 WG / Canada
jack_b/ 1XO / 1 WG / USA / Ordered
veereshai/ 1XO / 1 WG / USA (NoVa) Ordered
Bkhatton / 1XO / 1 WG / USA / Ordered
 
#33
GB Status Update. Thanks, Dawa!

Name / #XO’s (pair) / WG’s (pair) / Country
____________________________________
Bryguy / 1 XO / 1 WG / USA / Ordered
JHClark / 1 XO / 3 WG / USA / Ordered
32y0 / 0 XO / 1 WG / Australia
bloqhed / 1 XO / 1 WG / USA / Ordered
Dawa / 1 XO / 1 WG / Sweden / Ordered
Pinnocchio / 0 XO / 1 WG / Canada
jack_b/ 1XO / 1 WG / USA / Ordered
veereshai/ 1XO / 1 WG / USA (NoVa) Ordered
Bkhatton / 1XO / 1 WG / USA / Ordered

————

That’s 7 XO plus WG sets
Plus 2 WG’s only

I am going to give it until Friday before I close this GB and place the order for the parts.
 
Last edited:
#35
Name / #XO’s (pair) / WG’s (pair) / Country
____________________________________
Bryguy / 1 XO / 1 WG / USA / Ordered
JHClark / 1 XO / 3 WG / USA / Ordered
32y0 / 0 XO / 1 WG / Australia
bloqhed / 1 XO / 1 WG / USA / Ordered
Dawa / 1 XO / 1 WG / Sweden / Ordered
Pinnocchio / 0 XO / 1 WG / Canada
jack_b/ 1XO / 1 WG / USA / Ordered
veereshai/ 1XO / 1 WG / USA (NoVa) Ordered
Bkhatton / 1XO / 1 WG / USA / Ordered
dBel84 / 0XO / 1WG / USA / Ordered

have been on the fence but I may will likely build this speaker as it keeps eating away at my dreams 😉

thanks for putting this together X

..dB
 
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Reactions: Russellc and xrk971
#40
Hi Folks,
I have some nice big value MKP caps rated at 330VAC or 940VDC that I am using as the main high pass cap for the critical midrange. This is what I am using on my own XO. If anyone would prefer this over the a Dayton 250v MKP let me know by putting a note next your name (big cap option) and I’ll swap that out for you. I personally feel these sound great but since I had already indicated that caps would be Dayton or Audyn, I’ll leave the choice up to you. They measure 60mm dia x 57mm L. Wires have 25mm pitch spacing and are 1mm thick.
1653590003493.jpeg
 
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