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Old 29th March 2007, 04:12 PM   #121
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Ed -are we talking about the Dayton RS180 or RS180S here?

Assuming the former, then with the drivers paralleled, so Sd & Vas double, and impedence (Re & Le) halves then I get this, from an MLTL: 48in x 7.5in x 12in (Internal HxWxD), Zdriver between the two units 10.25in, 3in diameter, 6in long vent, 0.25lbs ft^3 stuffing in the first 28in of the line. Admittedly this doesn't take what occurs with the XO into account, but from a mechanical standpoint it should still be happy enough. In-room, it'll be a bit over-powerful in the LF to be honest -could do with rolling off some more as room-gain is going to boost it a fair bit. Damping the bottom of the cabinet should sort that as we'll get closer to an aperiodic alignment. Either that or shifting to a classic negative taper TL alignment.

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Scott
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Old 29th March 2007, 04:26 PM   #122
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Scott,

Yes, the Dayton RS180. I plan to use Jon Marsh's Modula x-over and baffle lay-out. My response is in anticipation of room gain. I've fiddled at length with the parameters and found what I think to be a "sweet spot". It yields a response above ~150 Hz that is +/- 1 dB of the infinite baffle response. Using only 0.15 lb/cf in the upper ~third. Glad to share if you wish....though mostly concerned with energy storage issues here...and recognize I may have some with panels 14" wide.
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Old 29th March 2007, 04:40 PM   #123
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Quote:
Originally posted by Ed Lafontaine
dimensions will be 39" h x 7.5" wide x 14" d.

I'd run a single holey brace most the length of the box with attachment just off-centre of the largest panels. Maybe a bit more then just off centre, since that take you uncomforatbly close to having 6 panels the same width... maybe move it to a 4th root of 2 ration?

Then i'd add at least a vestigial holey brace from the driver cutout to the cross-brace.

As an ML-TL it shouuld be fairly tolerant of a little volume loss (you dsaid you had the pieces cut.

An unbraced 14" panel is pretty significant size, i don't think dowls are going to do much.

dave
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Old 29th March 2007, 04:56 PM   #124
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Hi Dave,

I'll look at that. I'm not stuck on the volume. The panels are still 49" long so that option is open. I've got some BB large enough for the holey braces as well.
I'm less concerned for the baffle. Home builders use a material called "LVL". The pieces for my baffles are made of this. They are 1-5/8" thick poplar plywood. There will be ~1/4" hardwood applied to them.
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Old 29th March 2007, 05:20 PM   #125
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Quote:
Originally posted by Ed Lafontaine
I'll look at that. I'm not stuck on the volume. The panels are still 49" long so that option is open. I've got some BB large enough for the holey braces as well.
I'm less concerned for the baffle. Home builders use a material called "LVL". The pieces for my baffles are made of this. They are 1-5/8" thick poplar plywood. There will be ~1/4" hardwood applied to them.
BB will make a better brace than MDF. The point with the vestigial brace for the driver, isn't with bracing the baffle, but creating a situation where the only thing attaching the driver to the structure is not the bezel. ie it is a brace -- support for the back of the driver.

dave
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Old 29th March 2007, 05:31 PM   #126
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MJL - I trust you'll listen to them before measuring them?

Otherwise you could hear what you see.
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Old 29th March 2007, 05:53 PM   #127
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Quote:
Originally posted by Ed Lafontaine
Hi Dave,

I'll look at that. I'm not stuck on the volume. The panels are still 49" long so that option is open. I've got some BB large enough for the holey braces as well.
I'm less concerned for the baffle. Home builders use a material called "LVL". The pieces for my baffles are made of this. They are 1-5/8" thick poplar plywood. There will be ~1/4" hardwood applied to them.

If I read you right, that's a total baffle thickness of approx 2/3 the mounting depth of the driver. I'm not familiar with the driver, and the pictures show a small magnet profile, with super-sized terminals.

Even fully rebated to flush with the front out the panel, you'll have a narrow constriction unless you chamfer or countersink the rear of the driver opening.
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Old 29th March 2007, 07:49 PM   #128
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chrisb,

That's a good point. I plan to chamfer the inside almost to the rebate for the driver.
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Old 29th March 2007, 08:00 PM   #129
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Dave,

The thought I've put into the vestigial brace leaves me challenged:
Fewer pieces would be ideal...as in just one. I think the time spent in fit-up for just one piece gets into trying even my patience...so I think I'll do it in 2: one that is fit to the drivers mounted in the baffle and one that extends from the back of the case. I'll overlap them, glue and screw them together.
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Old 29th March 2007, 08:30 PM   #130
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Quote:
Originally posted by Ed Lafontaine
...so I think I'll do it in 2: one that is fit to the drivers mounted in the baffle and one that extends from the back of the case. I'll overlap them, glue and screw them together.
That works... i'm just used to Chris' drive to get things just so... when he is out with one of these, a single piece of paper (sometimes folded) is all that is needed to get that tight fit (and often thats my fault for using a thicker than expected gasket)

dave
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