10F/RS225 FAST / WAW Speaker XO PCB GB

[xrk971]

Thanks, Mordikai! Glad you will be making this speaker.

 

[jwjarch]

Name Quantity Boards Country
xrk971 8 USA
Jwjarch 2 USA *Pre-Order Placed*
Ray21 2 USA
mordikai 4 USA
Webber 2 USA *Pre-Order Placed*
Drpro 2 USA

 

[drpro]

Looks like it will take a few of the KOA BPR series as the largest value I saw was .47R

 

[xrk971]

Bigger ones exist like this 10ohm and 47ohm one. Just nothin stock at Mouser.

BPR58CFT10LJ KOA Speer | Mouser

BPR58C47LK KOA Speer | Mouser

 

[drpro]

Well darn that Mouser.

 

[drpro]

X, some years ago I rebuilt my L-220 crossovers and used foil inductors. I noticed there is a difference in the resistance on the BOM list versus a similar 4mH foil inductor. Would this make any or no difference in the crossover performance?
Thanks
David

 

[xrk971]

I just re-ran the Xsim calculation of the frequency response with a 14ga flat copper foil 4mH Jantzen inductor with 0.6ohm DCR vs the 1.26ohm DCR of the 18ga wire inductor and see a mild improvement in the bass response - maybe 0.5dB at 50hz. It doesn't hurt. Otherwise, the phase and frequency response elsewhere comes out the same. Subjectively, I would imagine a lower DCR will make the woofer sound more immediate and direct.

Jantzen Audio 4mH 14 AWG Copper Foil Inductor Crossover Coil

 

[drpro]

Thank you X.

 

[xrk971]

You are welcome. I must say I am a bit intrigued by all this talk of upgraded XO parts.

Maybe a new bypass cap and a flat copper foil inductor will send the sound over the top? I might have to try when I get the new XO PCBs in.

 

[drpro]

It is any intriguing idea. I spent as much on the updated/upgraded components as I spent on the JBL's when I bought them in the mid 70s.
Attached is a photo of the two crossover assemblies.

 

[drpro]

Just a pass along. Polk has a sale on the subwoofer you recommend X. Free shipping in the US, plus sales tax. PSW 10 - Polk Audio

 

[xrk971]

Thanks, that’s a great price for that sub. I use it with my 10F/RS225 FAST and it sounds great. Integrates seamlessly. I highly recommend it for anyone who has this speaker.

Although the TL build should reach 30Hz easily. A sub always adds more depth and presence.

 

[xrk971]

I ordered the PCBs so should be here by the end of the week. The 10F/RS225 TL speaker experiment by Vunce worked out superbly. I think the design is a keeper and worth making out of wood if you want a speaker that reaches deep but with articulate bass.

10F/8424 & RS225-8 FAST / WAW Ref Monitor

 

[xrk971]

I just got word that the PCBs have been shipped from the manufacturing house. So should be here in 3-4 days now. Although I will be away at a conference in Boston from Sunday through Wednesday so probably won't be able to ship out until next Friday.

 

[Vunce]

Great news X!
I was just swapping XO caps in my FAST TL’s tonight.

 

[xrk971]

I got a txt message from DHL saying the boards have been delivered. I will get back from travel late tomorrow and will ship them out probably on Friday.

Vunce,
Can you hear any difference between the caps?

 

[xrk971]

PCB's have arrived! 2mm thick with 2oz copper and gold (ENIG) finish.

Top:

Bottom:

 

[xrk971]

Very easy to build and everything fits perfectly! JPS64 did a fantastic layout here. There are thousands of vias connecting both sides of the board for essentially 4oz thick copper traces for super low impedance paths. It's a beautiful looking XO.

 

[jwjarch]

Very nice X and JPS! Looking forward to building it up!

 

[xrk971]

All boards have been shipped out to people who have placed pre-orders.
Thank you!