Mark Audio CHR-70 Application Thread - Page 9 - diyAudio
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Old 15th April 2009, 12:34 PM   #81
rabbitz is offline rabbitz  Australia
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Default Triffid... a simple little TV/FM/CD speaker

Quick easy speaker for a small room driven by 20W using DVD/FM/CD as sources.

Vented speaker, Vb=6 litres, Fb=59Hz, F3=49Hz, option of BSC / no BSC, long hair wool damping in the lower 200mm of tube, selective damping on inside walls. Can go lower but I've picked a compromise between low extension and power handling and the BSC is not required in it's current application.

Not usually a fullrange user but rate this driver above FR125S (sealed, vented), FE127E (vented, TL), W3-871SC (vented) in that order. Gets a thumbs up as a fullrange driver as unlike a lot of the others it does cover a broad range very well just like the FR125S but with a bit more life and detail. The detail can go missing in action when things get congested but that's to be expected at this price point and driver type.

The SPL is not a problem in my case as most amps have excessive gain anyway. The low impedance could be an issue for some amps (some tubes?) and also ChipAmps that are running high rail voltages.
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Old 15th April 2009, 04:43 PM   #82
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Quote:
Originally posted by Scottmoose
That's because there aren't any on the plan. 1in deep, equilateral triangle.

Quote:
Originally posted by italynstylion

When you say 1" deep do you mean 1" from the base wall to the tip pointed at the rear of the driver?

^I never got a response to this. If my terrible math is correct that would mean all 3 sides should be ~1.155inches?
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Old 15th April 2009, 05:04 PM   #83
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Sorry. Being human I sometimes miss things. Yes, although it's not particularly critical.
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Old 15th April 2009, 05:06 PM   #84
chrisb is offline chrisb  Canada
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Quote:
Originally posted by italynstylion


^I never got a response to this. If my terrible math is correct that would mean all 3 sides should be ~1.155inches?

Well Scott can correct me on this, but I think the exact geometry of this part is one of the lesser critical areas of the design. IIRC, on the Aiko with a similar wedge, I used a right / isosceles triangle (45/90/45) as I frequently use this shape for inside corner blocks as well, and had a few dozen feet of material pre-cut.

So with a height of 1" (25.4mm), the sides would be 1.41" (36mm)
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Old 15th April 2009, 05:12 PM   #85
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Sounds favourite.
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Old 16th April 2009, 01:02 AM   #86
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If the plans call for it to be a certain size I'm more than happy to get it right. I just wanted to be sure .

I cut the majority of the wood today and I have to cut a few more pieces tomorrow morning. I'll start assembly in the afternoon.
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Old 16th April 2009, 07:45 PM   #87
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Here is a visualization of one potential realization of the Lotus^2 (2 driver Lotus). This is the direction Chris & i have been talking wrt the ones we have underway. Note that the brace for the side driver is a circular shim mounted on the main holey brace.

Click the image to open in full size.

dave
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Old 16th April 2009, 08:11 PM   #88
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Nice touches.
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Old 16th April 2009, 08:50 PM   #89
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Did you change the top portion just to make it less top heavy?
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Old 16th April 2009, 08:57 PM   #90
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The drivers that are located on the sides of the cabinet; should they fire towards the center of the sound stage or away?
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