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Open Baffle Mark Audio project
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Fatmangolf View Drop Down
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Points: 8998 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Fatmangolf Quote  Post ReplyReply Direct Link To This Post Topic: Open Baffle Mark Audio project
    Posted: 02 Dec 2017 at 10:19am
Thanks again for sharing this Andrew. Very informative and impressive results, I have ribbon tweeters in my GX300's and love their sound too.
Jon

Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC.
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Points: 1468 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Richardl60 Quote  Post ReplyReply Direct Link To This Post Posted: 30 Nov 2017 at 6:33am
Bases covered!
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Points: 1544 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Drewan77 Quote  Post ReplyReply Direct Link To This Post Posted: 29 Nov 2017 at 10:11pm
I suppose that must be possible Richard but fortunately the sun was shining, it was the warmest part of the day, the previous day was sunny without rain and the last thing I did for both speakers was bring them out of the house, onto the platform. In all around 10 minutes before measurement started so I doubt these were influencing factors. 

Even when I carried the speakers back into the room, the rear metal frames still felt at room temperature. I also do the measurements using 3m speaker cables with all electronics still in place on their racks in the music room.
Older than I once was, younger than I'll be
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Andrew
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Points: 1468 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Richardl60 Quote  Post ReplyReply Direct Link To This Post Posted: 29 Nov 2017 at 9:35pm
Very good!

Do you think that low temps or dampness may impact iron the drivers and therefore the results at all?
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Points: 1544 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Drewan77 Quote  Post ReplyReply Direct Link To This Post Posted: 29 Nov 2017 at 8:35pm
I mentioned in an earlier post that I may replace the Alpair 7s with the Neo 3 ribbons. 

After listening to music over an extended period, the response of the Alpairs didn't quite match my memory of the Neo's (which I had used in the previous OBs for several years). With vinyl, the astonishing & delicate percussion sparkle which I was used to via the Accession was missing so I bit the bullet and decided to change things.

Initially I planned to take outdoor calibration measurements on a dry day last week but by the time everything was set up in the garden, it had become too windy to get a clean response, even using 36 frequency sweeps per speaker (about 2 minutes) which averages out all rogue sounds like occasional birds/distant aircraft/exasperated wife etc. The wind became almost gale force by midday when I was ready so I abandoned that.

I set it up again yesterday, which was dry and wind free - with the added bonus that this followed several days of continuous rain, meaning the lawn was soft & wet, reducing possible floor reflections even though the speakers/mic were raised well above it. 






Twittering birds are scarce at this time of year too & I must say that the results were by far the cleanest I have taken. After letting DEQX do its thing 0hz - 20k with frequency, phase, crossovers, group delay and impulse, a second set of verification measurements gave the 'semi-anechoic' response below. This is genuine, not a fake! The Neo's are powered by a pair of Proprius at 3024hz/300dB to the Apair 12s & because the speaker is measured as a 3 way, the interface is corrected automatically and seamlessly. Proprius & ribbons seem like a real marriage made in heaven.

It's not just about measurements of course so this afternoon I started to listen to a selection of LPs and CDs. It sounds marvellous so far, the sparkle is back and the system really does sound remarkable. 

N.B. I apologise that I post far less frequently than previously - the system needs no further adjustment and retirement gives us the opportunity to spend a large part of the year away with the family/grandchildren overseas. I listen to more music but spend much less time behind a computer screen and that has to be a good thing!



Edited by Drewan77 - 29 Nov 2017 at 8:38pm
Older than I once was, younger than I'll be
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Andrew
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Drewan77 View Drop Down
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Points: 1544 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Drewan77 Quote  Post ReplyReply Direct Link To This Post Posted: 26 Jun 2017 at 10:31pm
Thanks Stefan, it was very good of you to come over after such a busy two days & I'm gratified that you were so positive about what you heard. It's all very well having other visitors enthusing about what they hear but I appreciate critical and experienced ears like yours (even if still recovering from the excesses of Saturday!) 
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Andrew
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Points: 119 		Post Options Post Options   Thanks (0) Thanks(0)   Quote KJFAudio Quote  Post ReplyReply Direct Link To This Post Posted: 26 Jun 2017 at 8:45pm
I had the pleasure of going to Andrew's House last night to have listen to his speakers ( and look at some of his lovely art). It was quite late and was at the end of a long weekend exhibiting at Northwest Audio Show so I don't think my brain was quite as queued into the music flow as usual so my help probably wasn't as constructive as I normally try and make it, sorry Andrew.

Anyway, the speakers sounded great, the height and depth of the image really is astounding. Andrew has chosen his seating point to give him the best bass response and it really does sound very natural and believable, maybe at the expense of side to side imaging which does locate extremely well sitting slightly further forward but the bass does't sound quite as good. The integration of the sub bass to bass is I think the best I've heard. The integration of the rest is seamless as well as very very coherent.

I've heard quite a few customer builds since I started selling the Markaudio drivers but this one certainly had the largest scope, well done  Andrew.

Stefan
UK/EU dealer for Mark Audio Drivers and Manufacturer of speaker kits
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