Hi!
I've fallen down a rabbit hole of making a new speaker with the following drivers.
HF10AK
12P80NDv2
I have designed a constant directivity wave guide using ATH4 for the HF10AK. The simulated response is flat to +/- 0.5 dB between 1k and 10k out to 45deg off axis with a drop of 2.5dB by 15k. Plots are based on 100 points, 4mm mesh resolution.
I spotted a few posts from LineSource regarding "clever" enclosures so I will try that too - it looks like the Beyma can be forced to an f3 of about 85Hz.
The Beyma is mounted such that the acoustic center is similar to the Faital and held in place from the rear with a mouting ring of alumnium.
More to follow. Thanks for looking.
I've fallen down a rabbit hole of making a new speaker with the following drivers.
HF10AK
12P80NDv2
I have designed a constant directivity wave guide using ATH4 for the HF10AK. The simulated response is flat to +/- 0.5 dB between 1k and 10k out to 45deg off axis with a drop of 2.5dB by 15k. Plots are based on 100 points, 4mm mesh resolution.
I spotted a few posts from LineSource regarding "clever" enclosures so I will try that too - it looks like the Beyma can be forced to an f3 of about 85Hz.
The Beyma is mounted such that the acoustic center is similar to the Faital and held in place from the rear with a mouting ring of alumnium.
More to follow. Thanks for looking.
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This looks like a great project, and looking forward to seeing measurements. Will you be using passive or active crossovers?
At the moment I use an EV DC-one dsp with an MC2 T4 250 amplifer
The EV DC One has the following components
ADCs
CS5381 with MC33078 opamps
-110 THD / 120 DR
DACs
CS4398 with MC33078 and NE5532 opamps
-107 THD / 120 DR
AES DIGITAL IN
DA101C transformer into a CS8416
DSP
ADSP-21369
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Thanks! A quick lick of paint and drivers mounted for the prototype test!
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A very quick and dirty 800Hz BW3 at 15 (blue), and roughly 30(green) and 45(brown) off axis. 1/12th smoothing, no EQ. The 2k dip is found in the Faital res curve. I'll be a little more scientific over the weekend. 🙂
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Looks very good so far! Could you do me a huge favour, and post a spectrogram with the wavelet-setting?
similar to this:
https://www.diyaudio.com/forums/attachments/multi-way/879688d1601374768-reading-wavelet-spectrogram-0-5msinverted-png
similar to this:
https://www.diyaudio.com/forums/attachments/multi-way/879688d1601374768-reading-wavelet-spectrogram-0-5msinverted-png
The EV may have issues controlling the driver. I don't think that's uncommon. Final filters will require conformation/adjustment.
Are you sure?
If so, that would suggest that the raw driver response actually rises steeply below 800Hz, in order to make the resulting response (which you've measured) approximately flat to 500Hz.
Chris
High pass disabled at approx 1m at 0, 15, 30 and 45 in a not so amazing room with notch and 3.5k 5db highshelf only. 1/12th smoothing.
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great looking speaker Limacon, reminds me of my QSC clone waveguides. If your around the north west? I have a battery powered amp, measurement mic etc. happy to help out
Hey kipman725, thanks! It is work in progress. I'm down in Nottingham. I might end up with a wood cabinet with a machined anodized aluminium wg and woofer ring.
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