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Desktop speaker with Markaudio Alpair 5.2
Desktop speaker with Markaudio Alpair 5.2
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Old 9th May 2021, 07:05 AM   #11
Scottmoose is offline Scottmoose  United Kingdom
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Just so: the Gen3 unit is the Gen2 with a copper VC replacing the CCAW coil . Created at the behest of the Japanese distributor and his listening group of friends, who apparently felt a copper coil provided a more consistent tonality across the range. It didn't result in a significant parameter or FR shift, so they're drop-in replacements.

Nice job with the design BTW.
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Last edited by Scottmoose; 9th May 2021 at 07:09 AM.
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Old 9th May 2021, 08:24 AM   #12
Henkjan is offline Henkjan  Netherlands
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thanks for the compliment, and thanks for the info re the gen3.
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Old 9th May 2021, 09:34 AM   #13
Henkjan is offline Henkjan  Netherlands
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in the below schematic the 666uF for the HP is not indicated, to be "inserted" close to the driver. btw: while the exact value of this cap can be varied based on yr own listening, don't omit it, it is an essential part of the concept

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the next step was to translate this into a passive filter. an LR series with a single LCR shunt should be able to do the job. sims gave an inductor of 0.56mH and resistor of 2.2 ohm for the BSC and an LCR of 1.8mH/10F/3R0.

so soldering iron was heated and listening again. the bass sounded a bit on the heavy side now. so time to experiment with some of the values in the LR. The resistor was OK, but varying the L value (see the graph for simulated changes) made quite a difference: yes even changes small as 0.5dB are very audible. the 0.56mH coil made the bass too thick, the 0.39mH resulted in lack of warmth, the 0.47mH was just right.
after a couple of hours I decided on the 0.47mH inductor.

so the final filter is:

note that R1021 represents the sum of the actual resistor and the dc resistance of the coil.


and this is the actual filter (no room for a print or other fancy stuff)
a 14gauge Janzen wax coil for the LR, a thin wire air coil (baked) for the L in the LCR since a high Rdc (2R2) is no problem here
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Old 9th May 2021, 12:11 PM   #14
Henkjan is offline Henkjan  Netherlands
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Desktop speaker with Markaudio Alpair 5.2-filterschema_final_hp-jpg
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Old 9th May 2021, 12:42 PM   #15
Scottmoose is offline Scottmoose  United Kingdom
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666?
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Old 9th May 2021, 12:45 PM   #16
Henkjan is offline Henkjan  Netherlands
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Quote:
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666?
just a coincidence
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Old 9th May 2021, 01:30 PM   #17
zman01 is offline zman01  Bangladesh
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Desktop speaker with Markaudio Alpair 5.2
666uF sounds like a big cap Henkjan...!
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Old 9th May 2021, 04:05 PM   #18
planet10 is offline planet10  Canada
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Desktop speaker with Markaudio Alpair 5.2
It is huge. A good poly will coat more than the drivers, ($100.47x2+$28.12 CAD for 2 speakers -> $516 so one will be forced to use a bi-polar).

3 x 180 @ 7.37 + 5.24 -> $54.70 CAD still pricey.

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Old 9th May 2021, 07:37 PM   #19
Henkjan is offline Henkjan  Netherlands
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yes, I have put 3x 220uF bipolar (€4 each) and a 5.6 poly (€3). both size and price made the choice easy.

poly would be better, in my 3 way with the css sdx10 in sealed cab with hp the improvement in bass quality was clear (I had bipolar in the test version, poly in the final)
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Old 9th May 2021, 08:48 PM   #20
Henkjan is offline Henkjan  Netherlands
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I have used this type before in for example hp part of the midrange
MKP Folien Kondensator Radial 47mF 850V DC Icel MHBS455470KRSD1 47000nF

when it does not say audio, usually prices are lower
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