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Multi-Way Conventional loudspeakers with crossovers

Freq measurements and Hypex Filter Design adjustments
Freq measurements and Hypex Filter Design adjustments
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Old 6th July 2019, 05:40 PM   #21
Steve2111 is offline Steve2111
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Default Freq measurements and Hypex Filter Design adjustments

How is it that the nearfield measurement for woofer looks nothing like manufacturer's graph? It starts dropping to lower at lower freqs from 600Hz?????
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Old 6th July 2019, 05:56 PM   #22
ctrlx is offline ctrlx  United Kingdom
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check your acoustic measuring setup by doing a physical loop back.
the response should be very flat, +/- 0.05dB and +/- 0.1deg should be attainable
take near field tests ungated, no smoothing is needed.
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Old 6th July 2019, 06:01 PM   #23
Steve2111 is offline Steve2111
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Default Freq measurements and Hypex Filter Design adjustments

Thanks CTRLX
How do loop back?
Attach manufacturers Woofer Focal Audiom 15WX
Doesn't look like my measurement
Attached Files
File Type: pdf FOCAL_WOOFER_AUDIOM_15WX.pdf (698.9 KB, 15 views)
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Old 6th July 2019, 07:43 PM   #24
CharlieLaub is offline CharlieLaub  United States
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Did you turn off the filters before taking the latest measurements in post #19???

It sure looks like your woofer is being fed by a 500Hz HIGHPASS filter! It would make more sense if the woofer used a LOWPASS filter around 500Hz. Could that be the source of the drooping response issue?
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Old 6th July 2019, 07:48 PM   #25
Steve2111 is offline Steve2111
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Default Freq measurements and Hypex Filter Design adjustments

Turned off all filters
Muted all drivers except Woofer and response looks like a Mid range!!!!
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Old 6th July 2019, 07:50 PM   #26
Steve2111 is offline Steve2111
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Default Freq measurements and Hypex Filter Design adjustments

And as I said, the measurement looks nothing like the manufacturer's!
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Old 6th July 2019, 08:23 PM   #27
CharlieLaub is offline CharlieLaub  United States
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I have to agree with you... that does not look right at all for a 15" woofer!

Is there any way you can temporarily connect the woofer to a different power amplifier, any one at all, and test using that? Doing that would help to determine if the problem is the driver, or with the Hypex amp/DSP unit.
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Old 7th July 2019, 03:05 AM   #28
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Default Freq measurements and Hypex Filter Design adjustments

Difficult now because speaker wired via Neutrix. Before going "Digital" the driver sounded better with passive xover and valve amp. In theory the DSP way should sound better.
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Old 7th July 2019, 08:06 AM   #29
Juhazi is offline Juhazi  Finland
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It just takes more learning by doing...

Ask a friend to visit and check connections and settings, you get blind to basic mistakes.
Been there, done that!
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Last edited by Juhazi; 7th July 2019 at 08:10 AM.
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Old 7th July 2019, 09:02 AM   #30
Steve2111 is offline Steve2111
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Default Freq measurements and Hypex Filter Design adjustments

Thanks Juhazi. Yes I'm there now, but as I'm no electrical engineer I'm experimenting with caution so as not to blow a tweeter or amp.

Well I've re done the nearfield for Woofer and Mid and got more logical results.

I was told how to mute the channels. As when I ticked the Mute box the channel did not stay muted, I disconnected the cables for Mid and tweeter channels. Perhaps the Hypex Dlcp or amps did not like that???

Anyway to mute a Channel you have to reduce its Gain to -96db. Not via Mute button! I don't know whether I have ever read that in the instructions and I cannot read minds!!

So I attach better looking freq responses for Woofer and Mid (not scaled because different volume settings) and no filters.
Attached Images
File Type: jpg Woofer1smooth.jpg (448.7 KB, 91 views)
File Type: jpg Woofer24smooth.JPG (519.8 KB, 92 views)
File Type: jpg Mid1smooth.JPG (442.7 KB, 92 views)
File Type: jpg Mid24smooth.JPG (504.5 KB, 92 views)
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