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Alpair 10.3 FAST / WAW guidance needed
Alpair 10.3 FAST / WAW guidance needed
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Old 12th September 2019, 03:21 PM   #21
Lars Aalto is online now Lars Aalto  Finland
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So this is how they turned out, still lots to do but first soundtest very positive.

Crossed now at 80hz, need to measure to get them set correctly.

They kick like a mule. :-)
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Old 15th September 2019, 05:34 PM   #22
Lars Aalto is online now Lars Aalto  Finland
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First adjustments and measurements done, not a small task to adjust phase, crossover and volume for all parts separately.

At least the sub part is now adjusted, thanks to Audyssey for fixing the 30hz bump.

Next step far & near field measures for all with REW. I think I'll test a higher crossover, now it's 80hz.
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Old 19th September 2019, 06:41 AM   #23
Lars Aalto is online now Lars Aalto  Finland
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So, measurements done and still happy with the results. Might try a little notch filter for the 5-10khz range, it does sound a bit bright but not annoyingly.

The sealed Alpair 10.3 measure down to 30hz -6db without subs but they are crossed over at 80hz to keep the 80-200hz area smooth.

All in all the total costs for the pair was around 500€ - 200€ for the plate amps, 200€ for the elements and 100€ for plywood & misc.

Now just need to finish the surface and prepare for painting.
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Old 22nd September 2019, 11:58 AM   #24
Lars Aalto is online now Lars Aalto  Finland
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Finally proper(?) measurements and might want to try a notch filter for 5-10khz range.

Looking at the graphs, first one is individual speakers wo subs at 1m, second one both at listening position with 3 different angles (0-5-10 degrees inwards)

Filter calculator gives me a series filter with 0.2mH coil and 4.5uf cap, does that sound right?
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Old 22nd September 2019, 04:51 PM   #25
planet10 is offline planet10  Canada
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Alpair 10.3 FAST / WAW guidance needed
Or just listen off-axis.

dave
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Old 22nd September 2019, 05:15 PM   #26
Lars Aalto is online now Lars Aalto  Finland
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Quote:
Originally Posted by planet10 View Post
Or just listen off-axis.

dave
I'm already listening off-axis, but that still leaves the 5-10khz range around +5db. If I turn them away, that drops the 10-20khz too much down but 5-10khz doesn't go down much.

It's a trial, I might prefer without the filter but also looking to build my skills with speaker building and measuring. Doesn't hurt if sound improves as well.
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Old 22nd September 2019, 05:29 PM   #27
planet10 is offline planet10  Canada
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Alpair 10.3 FAST / WAW guidance needed
Eric had a similar issue with his A10.3 in FHXL. You might check to see what filter he used.

dave
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Old 23rd September 2019, 07:54 AM   #28
Lars Aalto is online now Lars Aalto  Finland
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Thank you, seems he had very similar measurements and the filter response was as calculated in measurements. Using a parallel filter seems smart so I can adjust the dampening just by changing the resistor if needed.

I played around with the calculator and I'll try first with
R:10 Ω C:9 μF L:0,05 mH

That should cut just between 5-10kHz as needed but let's see.
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Old 25th September 2019, 06:02 AM   #29
Lars Aalto is online now Lars Aalto  Finland
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Today I learned two very important lessons:

1. Audyssey (my room correction) setting "Flat" corrects the WHOLE frequency range, regardless of any limitations set. This was messing with all my measurements, now I managed to set the crossovers and subs to pretty perfect combination.

2. The 5-10khz bump was caused by early back wall reflections. I accidentally did measurements with some clothes lying on the sofa back and poof - the bump was gone. So, instead of needing a crossover (already ordered, dammit) I need to add some light treatment to the back wall.

Live and learn, that's the fun part of DIY.
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Old 25th September 2019, 06:08 AM   #30
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