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Old 17th September 2007, 11:35 PM   #1
ashok o is offline ashok o  United States
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Default Speaker enclosures for Lowther DX55

Hello
I have a pair of Lowther DX55 that came from my rethm 3rd that got badly damaged during shipping. Now I am left with these magical drivers that I would like to either build or buy cabinets for, any suggestions on what type of horn or bass reflex cabinet to try? I want to stay with these drivers as I adore its speed and transparency.
Currently I mounted them on a neat acoustic cabinet which is not ideal at all. I use a Korneff 45 SET to drive it with Naim Audio pre and CD player. Love it!
Thank you in advance for your advice and suggestions, now back to the music :-)
Ash
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Old 18th September 2007, 12:39 AM   #2
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If you want to run them solo, a horn is about the best thing to do with them, though they'd make an excellent wide-band mid / treble unit with a supporting woofer. The latter would have to be good to keep up though.

FWIW, a hyperbolic horn with an M=0.5 (according to GM, the ~optimal is around this point, and the models I've run concur)is probably as good a bet as any. However, a problem is that the Lowther parameters are a trifle 'optimistic' shall we say (i.e. so far out as to be almost valueless, if current evidence regarding the 8in units is anything to go by). So unless you know of some reliable figures, or can measure them yourself, you'll have to fudge it a bit. Select a throat CSA=0.25 - 0.5Sd, and plug this, the flare constant, and flare frequency into an applet like the one on the single driver site, then use this formula GM told me about a while back, and which I generally use when not using Leach's math to calculate the volume of the filter chamber:
V = (5.47/fc)*At
where:
V = volume of chamber in liters
Fc = upper corner frequency of the passband in Hz
At = area of the throat in cm^2

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Old 18th September 2007, 04:28 AM   #3
frugal-phile(tm)
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Scott,

Ashok had asked me by PM if i thot these would work in a Frugel-Horn. I waffled. What do you think?

What about the Spawns (Mikasa?)

dave
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Old 18th September 2007, 09:21 AM   #4
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I suspect they'd be a bit big for the Fugel-Horns as-is. It's not exactly scientific, but it might work OK in a Level 0 build with the width boosted by 20mm. Of the Spawns Hiro would likely be the best bet as there's plenty of volume to work with. They'll probably be very boomy at first due to that, and excursion would be too high, so it'd be a case of strategically damping the enclosure to taste, just like it used to be when driver specs were not available to the DIYer. Anyone know of some accurate measurements for the DX55?
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Old 18th September 2007, 11:13 AM   #5
DUC985 is online now DUC985  Germany
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Default PM6A

Scottmouse,

what kind of enclosures would work nice for the PM6A ?
I do not liky my Academy's too much, as there is basically no real bass and they are a little bit shouty.

thx


Mathias
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Old 18th September 2007, 11:38 AM   #6
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I can't say I'm entirely surprised the Academy lacks bass. How many drivers have you got -IIRC, the Academy uses two units per cabinet?

There are plenty of possible options that will work well, but which suits you best depends on what sort of cabinet, and what sort of sound you like (and can fit in your room).
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Old 18th September 2007, 12:27 PM   #7
hm is offline hm  Europe
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Hello,

the klein horn is an alternativ:
http://www.passdiy.com/pdf/KleinHorn.pdf
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Old 18th September 2007, 01:39 PM   #8
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That it is, so long as you have a barn to put a pair of these monsters in.

Wonder what they'd've been like if a hyperbolic expansion had been used...
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Old 18th September 2007, 05:53 PM   #9
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Scott, you naughty boy
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Old 18th September 2007, 08:24 PM   #10
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Default Re: PM6A

Quote:
Originally posted by DUC985
what kind of enclosures would work nice for the PM6A ?
My current favorite is a baffled system with the PM6A, Ticonal
and silver vc and a woofer-of-the-week. You have to build an
active crossover, but the enclosure is easy enough. I plan to
have a pair at RMAF.

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