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Old 4th March 2009, 10:46 PM   #151
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Hey all.

I'm nearing completion on my Tabaq's... although when I'll get another free day to play I do not know.

Serious question:

What's the preferred material for the batting? I've always built my speakers (all BR's) w/o batting as I'm a lunatic of sorts. So I don't know much.

Does the madisound stuff sound appreciably different from say... fire-resistant stuffing for cushions, or teased wool???

Basically I don't want to get these badboys all laced up and then have to open the box again. Lazy...

Also, I'm toying with the idea of using a nice bit of solid poplar for the front panels as it will give me a wood grain on the front without having to veneer. Is poplar too light/soft for an enclosure like this?

Thanks in advance
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Old 6th March 2009, 12:46 AM   #152
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Hi Ray, yes indeed, black marble. Thanks for your comments, though not wholly deserved, as the marbLe work is being done professionally.
I am doing a stint in Asia at the moment, and the best option for a reasonable system was to bring just the drivers etc, and build the cabinets locally.

Per speaker, the marble was US$30 (just the cheap homogenous stuff, avoiding the fault lines, imperfections and grain-matching problems of natural marble), and labour another $30. I suspect I am paying at least double the local market rate for the labour, but this is not the shop's usual kitchen counter / garden table, and has taken quite a bit of their time to explain properly, and of course it's still a bargain compared to the same work back home.
So all in all quite a bit more expensive than for those builders who just happen to have a sheet of MDF, a couple of drivers, the right coils, a pair of Y-fronts, and 50' of rope "lying around, spare"., but the wife acceptance factor for these is high.

I will post some pics when the second speaker is done. I just followed the standard design for the first. Although it looks great, the shop's polishing machine can't match the factory prime-face finish on the sheet edges, so for the second speaker I have used diagonal joins etc, to hide the panel edges. The whole cabinet is totally solid and heavy, so I don't expect the different construction to change anything sonically.

BTW for the stuffing, I am just using polyester pillow/cushion stuffing, which looks identical to "sonofill" to me. No idea if it's optimal. I think the density is probably more important than the actual material?
Poplar sounds beautiful - I was toying with having a wood face and marble sides etc, but I know nothing about the acoustic implications of that, so stuck with a material that "doesn't move", as was recommended to me.
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Old 8th March 2009, 08:41 PM   #153
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(Sorry if this is a dumb question) Anyone know the sensitivity for the tabaq's? Will a Peter Daniel lm3875 chipamp be too aggressive?
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Old 8th March 2009, 09:44 PM   #154
Svein_B is offline Svein_B  Norway
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I recon around they will be about 82dB at 1 Watt.

Not very sensitive, so they need a bit of power. On the other hand they can not play very loud, so a lot of power will not be required. 20 Watt should be plenty.

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Old 9th March 2009, 04:16 AM   #155
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They can't play very loud??? (Well, not that surprising really...)

I assume they can reach the kind of SPL that's considered "loud" in a small apartment though?
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Old 9th March 2009, 04:49 AM   #156
ltmon is offline ltmon  Australia
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Mine use 4" drivers, specified at 86db/w/m.

I power them from a 25W per-channel amp into 4 ohms, and don't use the baffle step filter in the design.

I would say they are well and truly loud enough for my small-ish loungeroom. I have only had them on full volume once, just to see where it gets to. I'm not someone who wants to listen particularly loudly however, but still want enough to block out most background noise and be immersive.

The drivers can apparently handle 40W, so I would estimate that with a more powerful amp they can be pushed further than what I am doing.
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Old 9th March 2009, 05:29 AM   #157
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Ah, reassuring. I like to have to potential for loudness because I have to dual-use my speakers for movies and hifi as I have but a small flat. I find a good stomp through batman with the volume way up is always fun


House hunting may be in the offing which means a workshop and a dedicated soundroom! WHHEEEE!!!
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Old 13th March 2009, 02:55 AM   #158
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Well I took some pics today....


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Just something about this build, despite home depot cutting a few pieces incorrectly it's gone swimmingly well so far. I can't wait to hear them.
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Old 13th March 2009, 03:12 AM   #159
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How do you guys find it balances? I'm worried that I should put on a plinth of some fashion?
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Old 13th March 2009, 06:52 AM   #160
ltmon is offline ltmon  Australia
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I haven't made the "tall" version, and it balances just fine with cheap rubber stick-ons on the bottom.

I have a cat, a dalmatian and a vizsla running rampant in my house and they haven't knocked it over yet -- despite some attempts.

Your photos look good. I would encourage you to try and recess the driver, so it's flush with the baffle. Also, if you can, do some work on the inside of the driver cutout so you get more air flow to the underside of the driver. Use a router with a 45 degree chamfer bit to scrape out some extra room between where the screws will go. This second part especially makes a very big difference to the sound, and the first part has positive effects especially in the higher frequency areas.
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