🙂 Had a long weekend, lots of rain keeping me indoors and not much else to do before work in the afternoons this week...
Fully sealed and stuffed... cotton-felt top 1/2, next 1/4 poly-fill & last 1/4 is open with cotton-felt lining the base... plus initial sanding with 60 grit s/paper.
First look at the miniSharc layout... hoping to have this wired and all playing by the end of next week 🙂
Paul
Fully sealed and stuffed... cotton-felt top 1/2, next 1/4 poly-fill & last 1/4 is open with cotton-felt lining the base... plus initial sanding with 60 grit s/paper.
First look at the miniSharc layout... hoping to have this wired and all playing by the end of next week 🙂
Paul
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Yes, more details on all the parts needed to get the miniSHARC up and going. It looks like you need digital I/O and how are you handling analog outs? I am looking at this as it provides opportunity to do FIR linear phase XO's and EQ. Not sure if you need qnty 2 miniSHARCs to do a 2x4 XO though?
In fact I am still confused as to what the MiniShark does, I have the MinDSP 2x8 with Vol-Fp and Digi-FP. Works great, and with the mic can do room optimisation. I have read the blurb on their site, but still none the wiser...
OK 🙂 ... mimiSharc is very similar to miniDSP, just a more powerful DSP engine and more scope for a custom build.
miniSharc is 4x8 : 2x i2s & 2x s/pdif input's and 8 i2s output's.
Has the option of either a full digital I/O daughter board or a full analogue I/O d/board... also has a dedicated s/pdif input with ASRC built into the miniSharc via the i2s header.
For analogue output you need stereo or multichannel DAC's with i2s input's i.e. Curryman DAC, Twisted Pear Audio Buffalo III, COD or OPUS DAC's or ACKO DAC etc...
The miniSharc plug-in download is available as 48 & 96KHz SR, you get more FIR taps with the 48KHz plug-in.
This 2-way set-up: miniStreamer : s/pdif > s/pdif : miniSharc : i2s > i2s : 2x Curryman DAC's... power supplies, two +5Vdc & one +/-15Vdc
I know Curryman has done a 3-way set-up, a 4-way should be possible with the right number of DAC's 🙂
miniSharc is 4x8 : 2x i2s & 2x s/pdif input's and 8 i2s output's.
Has the option of either a full digital I/O daughter board or a full analogue I/O d/board... also has a dedicated s/pdif input with ASRC built into the miniSharc via the i2s header.
For analogue output you need stereo or multichannel DAC's with i2s input's i.e. Curryman DAC, Twisted Pear Audio Buffalo III, COD or OPUS DAC's or ACKO DAC etc...
The miniSharc plug-in download is available as 48 & 96KHz SR, you get more FIR taps with the 48KHz plug-in.
This 2-way set-up: miniStreamer : s/pdif > s/pdif : miniSharc : i2s > i2s : 2x Curryman DAC's... power supplies, two +5Vdc & one +/-15Vdc
I know Curryman has done a 3-way set-up, a 4-way should be possible with the right number of DAC's 🙂
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Getting there slowly, it feels like for every positive step forward there's a near equal bad one holding things up. However, I'm being patient and trying to be nothing but positive 🙂
The woofer enclosures are very nearly ready, one is ready for veneering [not bought yet] and the second needs a touch more sanding down...
Made a start on the sealed mMarS enclosures for the MA Alpair7.3... 90% of the cutting is done, just the internal braces left to trim and make holey. The pin on the DIY circle cutting jig got a touch loose and I ended up with slightly oversized and wavy circles cut for the A7.3 rebates. Used some leftover veneer to line the sides [two layers] and have veneered the baffle front to hide the ~1mm imperfections... the rest will be left as plain BB with either stain, oil or wax finish 🙂
Paul
The woofer enclosures are very nearly ready, one is ready for veneering [not bought yet] and the second needs a touch more sanding down...
Made a start on the sealed mMarS enclosures for the MA Alpair7.3... 90% of the cutting is done, just the internal braces left to trim and make holey. The pin on the DIY circle cutting jig got a touch loose and I ended up with slightly oversized and wavy circles cut for the A7.3 rebates. Used some leftover veneer to line the sides [two layers] and have veneered the baffle front to hide the ~1mm imperfections... the rest will be left as plain BB with either stain, oil or wax finish 🙂
Paul
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You're getting there... Hang in there and you'll soon be in audio heaven!
Can't wait to see/read how you feel about the MiniSharc solution...
Can't wait to see/read how you feel about the MiniSharc solution...
Thanks 🙂
Initial listening impressions of the miniSharc set-up is very positive. Coupled to my headphone amp & Senn HD650 headphones, I can't hear any difference between the miniStreamer > miniSharc > curryman DAC and the ODAC by NwAvGuy.
Initial listening impressions of the miniSharc set-up is very positive. Coupled to my headphone amp & Senn HD650 headphones, I can't hear any difference between the miniStreamer > miniSharc > curryman DAC and the ODAC by NwAvGuy.
tidy work, mate - don't forget the panel damping pads before gluing last panel - not a lot of working room for man-sized hands inside the , uh, enclosure
almost said something else
almost said something else
🙂
Have ~1m^2, 2oz needled wool felt due this week. Similar stuff to what's used in the FH3... Looking forward to hearing these as I'd like a full complement for HT use 🙂
Have ~1m^2, 2oz needled wool felt due this week. Similar stuff to what's used in the FH3... Looking forward to hearing these as I'd like a full complement for HT use 🙂
😀
Wired one of the 8" woofers last night & this morning did a quick set-up & measure with REW and the miniSharc. Measured woofer & FH3, XO ~250Hz... this was done in my livingroom, which is 3.4m x 6m. PEQ was implemented on the input side only.
measured response & harmonics...
impulse response
Only listened in mono for about 1 hour, but does sound a lot better than the FH3 by itself, everything sounds clearer and bass has greater extension 🙂
Wired one of the 8" woofers last night & this morning did a quick set-up & measure with REW and the miniSharc. Measured woofer & FH3, XO ~250Hz... this was done in my livingroom, which is 3.4m x 6m. PEQ was implemented on the input side only.
measured response & harmonics...
impulse response
Only listened in mono for about 1 hour, but does sound a lot better than the FH3 by itself, everything sounds clearer and bass has greater extension 🙂
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Buildmesomething,
Very nice response there! How much PEQ did you apply (gain and freq locations) to get a flat response like this? When I was doing this with the Nautaloss, I was very careful not to do anything with narrow positive gain in the 500 Hz to 5kHz region otherwise weird phasiness could be felt which messed up spatial location and imaging.
Very nice response there! How much PEQ did you apply (gain and freq locations) to get a flat response like this? When I was doing this with the Nautaloss, I was very careful not to do anything with narrow positive gain in the 500 Hz to 5kHz region otherwise weird phasiness could be felt which messed up spatial location and imaging.
I'll do a screen grab of the filters created by REW. Something like 98% of the speakers' output was above my target SPL, so all the filters were negative IIRC. I've not listened in stereo as yet, so don't know if imaging etc has been effected.
The miniSharc plugin allows you to apply an initial PEQ on the input-side before channel routing and per channel XO, FIR or PEQ.
The miniSharc plugin allows you to apply an initial PEQ on the input-side before channel routing and per channel XO, FIR or PEQ.
Had a fairly good starting point, with the woofer giving the poorer response. Measures were taken so the room had [hopefully] little impact on the results... Set target level to 81dB, ~89% of the response fell above this so all the filters were negative gain. Max combined gain on the peaks is -9dB.
Before & after. XO in place on both measure...Woofer XO 200Hz BW 12dB/oct, A7.3 FH3 XO 270Hz BW 18dB/oct.
From the initial results, set REW for max individual gain 6dB, max overall gain 3dB and match level 3dB.
And then transferred the resulting filters to the miniSharc
Paul
Before & after. XO in place on both measure...Woofer XO 200Hz BW 12dB/oct, A7.3 FH3 XO 270Hz BW 18dB/oct.
From the initial results, set REW for max individual gain 6dB, max overall gain 3dB and match level 3dB.
And then transferred the resulting filters to the miniSharc
Paul
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I think your EQ looks very good with nothing extreme in the telephone band. The broad negative EQ at 1.1kHz is probably fine as it is so wide and needed for baffle step it looks like. I am surprised how much zing the A7 has above 10kHz that needed to be tamed. If you measure the A7 in nearfield (12 in) you can see if there are any funny things going with phase wraps from 500 Hz to 5 kHz that might alter the imaging when in stereo.
Nice work!
Nice work!
I wouldn't kill the 10k peak. It is required for the overall power response. You are looking at this on-axis, but you will listen off axis. Go back and do your EQ 10-15* off axis.
Bob
Bob
This was an initial EQ, trying to just level the response from the two speakers without countering any room interaction.
They're loud when played in the main room, but will live in a room roughly half it's size. I'll look at re-doing the initial measure off-axis as Bob has suggested, furthermore, I'll use a lower target level [80dB] and a tighter level match [2dB]. Once they're in the room and if needed, a second measure will be done to help with room correction.
Wired the second speaker this morning and spent the remainder listening to various bits of music. Imaging etc. appears rock solid, nothing strange occurring and the sound is very impressive. Have a three day weekend ahead, so can spend many hours listening and trying not to annoy the neighbours 🙂
They're loud when played in the main room, but will live in a room roughly half it's size. I'll look at re-doing the initial measure off-axis as Bob has suggested, furthermore, I'll use a lower target level [80dB] and a tighter level match [2dB]. Once they're in the room and if needed, a second measure will be done to help with room correction.
Wired the second speaker this morning and spent the remainder listening to various bits of music. Imaging etc. appears rock solid, nothing strange occurring and the sound is very impressive. Have a three day weekend ahead, so can spend many hours listening and trying not to annoy the neighbours 🙂