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10F/8424 & RS225-8 FAST Ref Monitor
10F/8424 & RS225-8 FAST Ref Monitor
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Old 12th January 2018, 04:38 PM   #951
perceval is offline perceval  Taiwan
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I looked up the SB23, and was pleasantly surprised they share a lot of TS params with my TB drivers... and then Vas, impedance curve, and a couple of others looked totally different. Too bad.

In the mean time, I've been looking around, and it looks like some have taken your idea of salvaging inductors. I think I will go dumpster truck diving soon!
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Old 13th January 2018, 12:20 AM   #952
xrk971 is online now xrk971  United States
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10F/8424 & RS225-8 FAST Ref Monitor
The SB23 is a really low distortion driver - perhaps one of the best I have seen when it comes to sealed woofers. The measurements from Bushmeisterís speaker were amazing. Anyhow, it deserves a box to be made around it. I think with a 24L box it will get about 50Hz and with low distortion.

A Bookshelf Multi-Way Point-Source Horn

This is with two SB23ís in a Pointsource Bookshelf Horn but at 50Hz and 100dB 1m, it was like almost -50dB THD.

Click the image to open in full size.
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Last edited by xrk971; 13th January 2018 at 12:25 AM.
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Old 13th January 2018, 12:40 AM   #953
mikejennens is offline mikejennens  United States
This speaker DIY thing, it's pretty addicting!
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10F/8424 & RS225-8 FAST Ref Monitor
Is that 24 L box sealed?

Thanks for all your input and sharing your knowledge X! My RS225/FF85 set are awesome speakers!!!

Mike
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Old 13th January 2018, 12:45 AM   #954
xrk971 is online now xrk971  United States
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My box for RS225 is 24L sealed and I plan to put SB23 in it. The above data from Bushemeister is a much bigger box I think.

I did not know you have an FF85WK and RS225 - is it using the XO I provided in this thread? That’s a nice combo.
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Old 13th January 2018, 12:48 AM   #955
mikejennens is offline mikejennens  United States
This speaker DIY thing, it's pretty addicting!
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Quote:
Originally Posted by xrk971 View Post
My box for RS225 is 24L sealed and I plan to put SB23 in it. The above data from Bushemeister is a much bigger box I think.

I did not know you have an FF85WK and RS225 - is it using the XO I provided in this thread? Thatís a nice combo.
Yes it is, but but the box is closer to 30L, sealed.
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Old 13th January 2018, 02:06 AM   #956
xrk971 is online now xrk971  United States
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30 L should give you some lovely bass extension. I know they are nice speakers because they have been on the stands in the room for 2 years now, and I have a lot of different speakers.
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Old 13th January 2018, 07:02 AM   #957
xrk971 is online now xrk971  United States
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I just made another set of nice XO's, these will be for my own speakers, new BB cabinets on the way. Here I am testing them with TG9FD-08. Works well, sounds very balanced.

Closeup of XO with all film caps:
10F/8424 & RS225-8 FAST Ref Monitor-10f-rs225-fast-xo-own-jpg

With TG9FD (8ohms)
10F/8424 & RS225-8 FAST Ref Monitor-10f-rs225-fast-xo-own-tg9fd-jpg
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Old 13th January 2018, 08:47 AM   #958
zman01 is offline zman01  Bangladesh
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Nice work X.
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Old 13th January 2018, 09:10 AM   #959
freddi is offline freddi  United States
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really nice - can a budget version be done with 4fe32?
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Old 13th January 2018, 09:46 AM   #960
perceval is offline perceval  Taiwan
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I'm working on something similar myself, but the FR is OB.
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