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10F/8424 & RS225-8 FAST / WAW Ref Monitor
10F/8424 & RS225-8 FAST / WAW Ref Monitor
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Old 17th February 2020, 03:05 AM   #2251
Bergarth is offline Bergarth
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Ah, yeah I don't have the PS95 yet. RS225-4 leftover from failed build lol I've been failing a lot. Also 5 6" SDS Peerless woofers 5 Dayton RST28F ��*♂️ chasing a sound.
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Old 17th February 2020, 07:19 PM   #2252
Bergarth is offline Bergarth
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Originally Posted by xrk971 View Post
Ok, if you have them already. It’s just you said you were going to get 7.
Heres what it simulates as in Xsim- I had to reverse polarity on PS95- doing so on RS225-4 is different phase.

Let me know what you think- Not sure what else to do with these 10-RS225-4 i have sitting around collecting dust.
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Old 18th February 2020, 12:28 AM   #2253
xrk971 is offline xrk971  United States
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There is a time delay if the woofer is on top and same as ear level. The delay will fix the phase flip that you had to add. It shouldn’t be reversed as that would not be a transient perfect speaker anymore. There is no reason that the PS95 would need to be reversed. Try adding equivalent of about 2.5in of time of flight delay to the PS95. Then try the XO tweaks.
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Old 18th February 2020, 01:35 AM   #2254
pcgab is offline pcgab  United States
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Originally Posted by xrk971 View Post
There is a time delay if the woofer is on top and same as ear level. The delay will fix the phase flip that you had to add. It shouldn’t be reversed as that would not be a transient perfect speaker anymore. There is no reason that the PS95 would need to be reversed. Try adding equivalent of about 2.5in of time of flight delay to the PS95. Then try the XO tweaks.
I'm trying to remember what I settled on before I stored them. In my original, one piece baffle the set back was ~1.5" to the Fostex FF85, then I made another set of baffles with ~3". The 3" as I remember it sounded much more coherent, and measured really well. The 3" was more a function of 4 layers of mdf, as opposed to 2 layers. It didn't measure as well as the one you posted certainly, but it was close.

I've been thinking about resurrecting these again, I made some boxes for the ff85's that sit on top, similar to B&W 801, or so I would like to think.

tl;dr:
~2.5" is likely the sweet spot.
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Old 18th February 2020, 04:51 PM   #2255
Bergarth is offline Bergarth
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Originally Posted by xrk971 View Post
There is a time delay if the woofer is on top and same as ear level. The delay will fix the phase flip that you had to add. It shouldn’t be reversed as that would not be a transient perfect speaker anymore. There is no reason that the PS95 would need to be reversed. Try adding equivalent of about 2.5in of time of flight delay to the PS95. Then try the XO tweaks.
I added it- hows this?
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Old 18th February 2020, 05:06 PM   #2256
xrk971 is offline xrk971  United States
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That looks better (both drivers positive phase) but there is a lot of dips and peaks in the midrange. Is that just the natural non-flat response of the PS95?

Your cap on PS95 is too big, it will lead to distortion as it makes the PS95 play too low. Make that 60uF.

Look at the Step Response graph and check your time alignment that way. The phase should be relatively flat from 100Hz to 10kHz.

This woofer is more sensitive, make R1 a short (0ohm jumper) and make R2 open (not populated) and that should balance the treble with bass more.

Aim for 900Hz crossover frequency by adjustment of R3 and C3.
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Last edited by xrk971; 18th February 2020 at 05:10 PM.
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