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10F/8424 & RS225-8 FAST Ref Monitor
10F/8424 & RS225-8 FAST Ref Monitor
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Old 12th February 2019, 11:25 AM   #1681
xrk971 is offline xrk971  United States
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Soundnovice,
The only thing you need to modify to taste is the padding (attenuation of the tweeter PS95) relative to the woofer. via ratio R1/R2. Just keep sum of R1 and R2 circa 10ohms and make R1 smaller and R2 bigger in order to get less attenuation of PS95-8. All else remains the same. Very flexible and adaptable XO as long as fullrange driver is 8ohms and at least 82dB sensitive.

Click the image to open in full size.

Given that PS95-8 is about 2dB less sensitive than 10F/8424, you might try 3.3ohm for R1 and 6.7ohm for R2. I would even try the default 4.7R/4.7R as first cut.

R5/C3 is the notch to reduce the 7kHz breakup peaks on RS225-8 and is specific to this driver only. In fact, the key to this XO is teh RS225-8 - as it is the foundation. You can change various midtweets and djut padding but not the woofer.
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Last edited by xrk971; 12th February 2019 at 11:31 AM.
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Old 12th February 2019, 11:35 AM   #1682
xrk971 is offline xrk971  United States
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Quote:
It is interesting that they use recycled materials, but this product would be almost impossible to recycle again, with the wood chips glued to the plastic.
Here are some closeup photos so that you can see the fine molded details and it looks like particle board but feels smooth. It feels warmer and more sound absorptive than plain plastic. Arduino genuine stuff is made in Italy and they use nice components. It's good to give back to the arduino .org as they are providing a great service with their free and open platform.

My first project is to use arduino to program an ATTiny85 to do routine logic stuff like open and close relays for an industrial automation device that has to be absolutely reliable.

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Old 13th February 2019, 08:33 AM   #1683
soundnovice is offline soundnovice
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some improvements:
tried harsch xover at 400hz in dayton dsp408. 1.25ms delay for the full range driver
with this, everything fell in place quite nicely. there seems to be easy transition between woofer and full range driver. yet to confirm with measurements, but the earlier 'fatigue' while listening with wrong 1st BW xover at 600hz is gone. i spent almost an hour listening to various genre and didn't feel tired. thats a good sign

next dragged the speakers away from rear wall by 1.5ft. the overlapping of bass notes reduced to good extent. but still couldn't move the speakers away from side walls for one of the speaker. i think for this reason bass is still not very 'fast' and also i think due to this volume at left speaker is more than that at right.

@xrk: with harsch, the requirement to invert the speaker boxes is not valid right? in dsp anyway we are setting 1.25ms delay. the drivers are not time aligned on the baffle. so should i add some more delay to compensate that? if so how do i calculate that. I am using ps95 driver.
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Old 13th February 2019, 01:25 PM   #1684
xrk971 is offline xrk971  United States
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Correct, if you had tweeter on top, and assume measurement point is coaxial with tweeter, then physical delay is less. In either case, delay is based approximately on the physical location of voice coils. It’s actually called the “acoustic center” but seems to correlate well with how deep the cone is and where voice coil attaches. Voice coil of PS95 is recessed about 2.5cm from bezel. Voice coil of RS225 is maybe 10cm recessed back. So your starting position tweeter is about 7.5cm in front of woofer already. Using speed of sound of 342m/sec that’s same as 0.22msec delay. So add this to the ideal Harsch XO delay. Of using say 400Hz XO then delay is half of period of 400Hz wave or 1.25ms. To that add additional 0.22ms or total 1.47ms (or as close as you can get with DSP delay). Since I am estimating the voice coil setbacks a 1.50ms delay is a good starting point.
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