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Old 30th April 2012, 04:56 AM   #31
zman01 is offline zman01  Bangladesh
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Quote:
Originally Posted by Scottmoose View Post
Oooh. That's pretty.
Yep, Douglas's work is good! I built my one mainly inspired by him and in search of bass (which I got plenty).

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Originally Posted by Scottmoose View Post
Very few I suspect; they just didn't catch on. I do have a couple on the drawing board for the new A12P; a standmount & a rather more ambitious floorstander, but I don't think there will be sufficient interest to justify finalising them.
3 builds that I know of from diyaudio forum members (including mine). For the floorstander what would be the differences vs the new Pensil?
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Old 30th April 2012, 05:43 AM   #32
chrisb is offline chrisb  Canada
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3 builds that I know of from diyaudio forum members (including mine). For the floorstander what would be the differences vs the new Pensil?

dude, do you really need another 2 or 3 projects?

I know that I don't

but then when the fonk has that stopped me?
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Old 30th April 2012, 07:25 AM   #33
zman01 is offline zman01  Bangladesh
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dude, do you really need another 2 or 3 projects?

I know that I don't

but then when the fonk has that stopped me?
Does Scott really need to design another cabinet?

Keep on building!
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Old 30th April 2012, 09:45 AM   #34
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They're completely different load schemes, only thing they have in common is that they're vented floorstanders. For the rest, I let other people decide.
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Old 6th May 2012, 04:16 PM   #35
zman01 is offline zman01  Bangladesh
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Scott,

You mentioned earlier that stuffing can be used to proactively manage the amount of bass and tighten things up. Ready to experiment again.

How would you suggest in going about it? Put the stuffing in both chambers or otherwise?

- Zia
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Old 6th May 2012, 04:27 PM   #36
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Originally Posted by zman01 View Post
Scott,

You mentioned earlier that stuffing can be used to proactively manage the amount of bass and tighten things up. Ready to experiment again.

How would you suggest in going about it? Put the stuffing in both chambers or otherwise?

- Zia
Zia,

I presume you mean Scottmoose not me, correct?

Scott
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Old 6th May 2012, 04:42 PM   #37
zman01 is offline zman01  Bangladesh
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Yes Scottmoose
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Old 12th May 2012, 04:19 PM   #38
zman01 is offline zman01  Bangladesh
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Default Experiments with stuffing

Got the A12 in the DBR aka Studio Reference Monitor cabinets again -this time with some acoustuff/dacron polyfill, as advised by the designer:

Brief description of my experiences:

1. Too much dense polyfill (~50% volume) in the upper chamber - kills the "life" of the driver - not fun or inspiring to listen too.

2. Fluffy/lower density dacron - ~50% stuff causes more vocal shout and treble becomes brighter - possibly driver backwave bouncing back?

3. Best results - 2 fistfulls of acoustastuff (slightly teased) in lower chambers, 3-4 fistfuls of same stuff placed in the upper chamber near the back panel - open sounding (not too shouty) and controlled LF.

Also found that the speakers seemed less susceptible to change of interconnects with the stuffing inside. Also switched from Hypex UcD to HifimeDIY T4 (Tripath Tk2050). This amp is slightly leaner and a bit harsher on the top - tends to make the drivers sound more metallic - a tube amp does the best in making them sweeter sounding. With the current config I am finding the T4 more suitable than the Hypex. The low end is controlled and punchy (would like a bit more kick, but maybe that is expecting too much from a 6.5 inch FR unit in a BR box), and mid and top end is very detailed. The sound stage is less expansive vs the Hypex though, but not bad. My Source is an Asus Xonar STX - which sounds kind of Hyper detailed to me (good and bad ), but the alternative with me is another Asus Xonar (cheaper 7.1 card), so feeling lazy to switch.

Have played a few genres, the speakers are doing a decent job. Diana Krall in particular was pretty nice, subtle bass notes, and the nuances of her voice coming through - need to give another listen this evening. On the other end of the spectrum, electronic music (mainly progressive house) was good too (I listen at moderate levels: ~75dB or lower, so not much chances of inducing over excursion in any way). Test tones indicate output from 40Hz and sounds realtively even over the range (sorry, no measurements ).

I dare not listen to metal, rock yet - don't want to spoil the fun. With the A12's tendency to bring out detail and it's neutral tonal balance, I am guessing it won't be too much fun listening to AC/DC or Carcass (without some sort of equalization).

This is looking like more like a long term home for the drivers, unless Scott (Scottmoose!) has some "B-side" treasure designs for the A12 that he might have come up in the meantime.

- Zia

Last edited by zman01; 12th May 2012 at 04:24 PM.
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Old 12th May 2012, 05:58 PM   #39
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This is some very interesting information, you've obviously taken a lot of time to experiment!

If you're going to leave these drivers in long term you had better get a hustle on and make finish of the exterior!
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Old 12th May 2012, 07:11 PM   #40
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Apologies, didn't see the past couple of posts until today.

-Over-damping can appear to 'suck the life' out of a wideband drive unit for a few reasons. If you go to excessive levels, the high acoustic load can actually deform the cone slightly under dynamic conditions, thus affecting the resonant behaviour of the cone (i.e. the mids & HF). Also, I'm not alone in suspecting that while many people demand accuracy, when it comes to listening, many prefer a degree of euphonic distortion in xyz forms, be it harmonics, a slight degree of underdamping at Fb etc.

-Possibly, although you'd need a fair quantity / density to get severe reflections. The above is more likely on that score. All materials behave slightly differently however -see Augspurger's TL paper for more, where he measured a few different types.
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