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Old 28th April 2008, 09:36 AM   #1
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Default Lowther DX3 questions ??

Now I have them, a couple of DX3's, for a decent price.
They are from 2005, so I think they have new whizzer cones.
I had never heard them before in my live so I was curious about their sound.
I quickly build some, oversised( see pic), Voight pipes, to get an idea of the sound ..... and they are AMAZING !!
Never thought a unit to be that good!!
I paid 400 Euro, but after about half an hour of listening I would have been willing to pay the full price.
Of course I did a lot of searching on this forum and the Internet, but what I'm looking for is personal experience of people who used the DX3 in different (more then one !!) enclosures??

How do others use them, and some remarks on the sound:

a, Horn loaded?
b, Full Range back loaded?
c, Anyone build something from the frugal site ? and results ?
d, a FAST system, and what woofer??
e, also found the BIB design on this forum , sound differences in sound; BIB vs BLH ??
f, any off Ron's design's (Fe206e) , what adjustments ??
g, anything else ??

Any help off someone who can really compare different enclosures will be very much appreciated!!

Leon
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Old 28th April 2008, 10:12 AM   #2
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Well, a few observations. It completely depends on what you want, sonically. We're all different and want different things. They were designed with horn loading & SET amps in mind, not that that means you necessarily have to use either. MLTLs etc. are perfectly feasable with a correction circuit or suitable digital Eq in place. Bob Brines has a design available on his site for just that.

They also work well as mid-tweeter units partnered with suitable LF drivers on OB too. As to which supporting drivers, that depends on what exactly you're trying to do. Same goes for box systems of any kind. Not many plans about for those systems -the Basszillia is one example of OB + box subs (can't remember how much DO charges), and Martin has some plans on his site for a full dipole setup, & useful papers, to say nothing of his MathCAD sheets

AFAIK, nothing on the FH site is designed for Lowthers. You can certainly stuff them into some of the larger boxes & they should work well, 'orns being relatively forgiving (within reason), though in prinicple it's always better to design a cabinet specifically for a driver. That said, given that there is considerable deviation between individual drive-units, and their parameters change anyway with both break-in, and with use generally (as the voice-coils etc warm up) a degree of lattitude isn't necessarily a bad thing. Regarding horns generally, a few other thoughts. a) In about 10 seconds from now Horst will doubtless recommend one of his own cabinets. (sorry, couldn't resist ) b) The BIB is a BLH, albeit using a degree of QW action across part of its BW (like 99.999% of other BLHs do, so it's not alone there) c) there are innumerable horn designs for Lowthers lurking on forums -scout around & see which grabs your eye, but beware: not all are necessarily great, so it's a good idea to thoroughly research the one that appeals (if any) in advance to see if it will suit your requirements (room, system, music, taste etc.) before making a decision.

FWIW, my friend Steve pulled his EX4s out of their original BLH & now runs them OB with vintage Goodmans drivers in support. Considerable improvement in all areas; however, that says more about the BLHs he had them in, which wasn't IMO optimal (though certainly entertaining) than it does about the merits of horns, baffles or anything else.
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Old 28th April 2008, 10:27 AM   #3
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Thank's for answering Scott.

I will keep the OB idea in my mind.
Wouldn't be to difficult adjusting the OB my Voight pipes are covering ( see pic)
Any idea's about X-over numbers ?, maybe something as on Martin King's site ??
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Old 28th April 2008, 10:55 AM   #4
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Depends on the drivers, frankly. There's not going to be a 'one size fits all' XO point that will work with every driver. FWIW, Steve
rolls the Goodmans units off above ~1KHz. On paper not ideal, but seems to work OK. As a rough guide, I reckon something around either 200Hz or 500Hz depending on your power-handling requirements should do OK.
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Old 28th April 2008, 12:38 PM   #5
sreten is offline sreten  United Kingdom
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http://www.quarter-wave.com/Project04/Project04.html
http://www.quarter-wave.com/Project06/Project06.html

Hi, both worth a perusal regarding the DX3, /sreten.
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Old 28th April 2008, 01:51 PM   #6
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Thank's sreten for contributing.

I do use an SE el84 amp ( 2x2,5 watt)
So only the OB , on Martin's site , will do.
BSC on the other 2 will decrease efficienty to much.
I'm not planning on upgrading my amp.
I was planning to get some gain in building a BLH, and so I'm looking for a good design wich will go down to 40-50 HZ.
I studied the frugel site and go probably for the "Sachiko".
Anyone build the Sachiko ??
Also charmed with the "curvy chang" design ; but I don't see the DX3 mentioned to be suitable ??
Is it possible to adjust the curvy design for the DX3 ??

Leon
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Old 28th April 2008, 01:57 PM   #7
sreten is offline sreten  United Kingdom
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Quote:
Originally posted by Leonidas

BSC on the other 2 will decrease efficienty to much.

Leon
Hi,

One possibility is a passive line level BSC filter before the amplifier.

e.g. http://sound.westhost.com/bafflestep.htm

/sreten.
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Old 28th April 2008, 01:59 PM   #8
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Digital Eq can do fine too, although the main issue with these boxes is LF transient handling due to their limited excursion, so it depends what's needed.

The DX3, looking at the measured T/S parameters Martin has on his site, and those Lowther recently sent me (for an unrelated purpose) should do fine in Sachiko, if you can cope with the size. There are a couple of build threads on this forum IIRC, & some recent remarks in the main Spawn thread here. Jeff Carder also builds & sells them commercially (renamed as Madison) using the FE206E -seems to get positive comments -FWIW, this is what one of his buyers left: http://forum.audiogon.com/cgi-bin/fr...3498&read&3&4&
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Old 28th April 2008, 05:07 PM   #9
gnugear is offline gnugear  United States
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Hey Scott, you said nothing on the Frugal Horn site is designed for the Lowther, but isn't the Sachiko designed with the Lowther in mind?

I'm planning on that for my next build in a few weeks with DX4 drivers. Should I change anything to accomodate the Lowther?

Leonidas, I have the DX3s in a BIB (Scott's dimensions not GMs) and they sound fantastic. I had the same reaction that you did and quickly started searching out more designs. I'm hoping the Sachiko will work well.
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Old 28th April 2008, 05:52 PM   #10
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No. It was designed specifically for the FE206E. The fact that other drivers should work quite nicely is a case of circumstance rather than design. BLHs are generally more forgiving of driver alterations (within reason) than, say, a regular BR enclosure in this respect, so if the parameters are reasonably close then it should do OK. I tend to deliberately put a little lattitude in my cabinets anyway, because driver parameters change when in use, and are subject to sample variability.

Anyway, looking at both Martin's & Lowther's T/S parameters, the DX3/4 should do OK, at the price of a little less LF grunt than the 206 it was designed for. Sachiko isn't lacking for gain down to 40Hz, so I doubt this will be a real issue. For e.g. this is what the modelled FR looks like with the DX3. SPL at 40Hz still 90db 1w/1m. Excursion's well within limits too. As usual with the three boxes based on this folding scheme, ignore everything over about 250Hz -the software isn't accounting for the midrange / HF attenuation provided by the folding scheme & damping.
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