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Old 6th January 2016, 02:34 PM   #1
terrago is offline terrago  Bulgaria
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Default 4 inch enclosure recomendation

Hello! I have these speakers:
2pcs HiEnd 4inch Full Range Speaker Defy Lowther Fostex New SE Edition | eBay

I want to build desk speakers. Can you recommend enclosure for these speakers? I'm new to this, so please, excuse my ignorance!
Thanks in advance!
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Old 6th January 2016, 03:03 PM   #2
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I have a few reservations over the marketing claims but leaving that aside, they should go in FH3 for example, and no doubt X could come up with a Karlsonator variation if you fancied something on those lines. Otherwise, a straightforward BR or compact TL variation would be possible; based on the stated spec. they should be relatively flexible in that sense.
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Old 6th January 2016, 03:07 PM   #3
xrk971 is offline xrk971  United States
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Ahh the whizzer coned AIR/Airborne/AirXXX never seem to go away...

Click the image to open in full size.

They look really cool, and I would love to get one to play with if they were super cheap - but they aren't quite cheap. The specs are not impressive and really, I wouldn't do anymore than put them in an OB or a sealed box with a FAST woofer support. A Qts of 0.68 and sensitivity of 86dB is nothing special. A Tang Band bamboo cone with no whizzer and Nd motor will sound better.

The response has a +12dB step at 7kHz which will make for some nice ringing and sibillant voice.
Click the image to open in full size.

Edit: Scottmoose beat me to it and he was more generous. I suppose it might work in a Karlsonator but that large Vas and high Qts would make a bloated box.

Last edited by xrk971; 6th January 2016 at 03:11 PM.
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Old 6th January 2016, 04:10 PM   #4
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Well, in many ways it's a slightly old-fashioned driver, at least in terms of the baseline EM spec. We've largely moved toward drivers with higher levels of damping and a lower volume compliance these days -primarily a result of people wanting smaller boxes, although I suspect the pendulum is swinging back a little (hope so).

Be that as it may. To be honest, I don't like whizzer cones much at the best of times, and I'm certainly not a fan of them on drivers of < 5in, because they really shouldn't be necessary, and the off-axis advantages a smaller unit can have may be lost through the phase shifts & whizzer blanking off sections of the main cone. The same can be said about [so-called] phase plugs for that matter, although usually to a lesser degree. Mostly it's pandering to fashion. Similar to the magnet -the frame looks fairly generic, so it's not getting much advantage from the smaller neo motor in terms of airflow. Probably a bit, so 'every little helps'.

From the data sheet layout, these look to be out of the Guide Sound factory in Taiwan, so they should be built reasonably, whatever reservations I have over the design itself. As far as the sound quality itself goes -YMMV, as always. Acoustics being what it is, what doesn't look great on a 1m on-axis FR may (may ) work / sound better in practice, depending on the context. As far as this one goes, it certainly has some issues. The old 98c tweak with a bit of damping around the base of the whizzer might take out some of the hash around 7KHz, which is probably a reflection. And shifting a few degrees off axis (not too many, or there might be more issues than it resolves given the configuration) may help balance out the top end somewhat. A lot of whizzer-cone units were developed on that assumption, since it does tend to make for a wider practical horizontal / vertical listening arc, at the price of it being a bit hot on axis. I haven't had much to do with Karlson variations, but I suspect that might be of some benefit, albeit the box would no doubt be larger than some other units in this size bracket. Overall, I'm not convinced it's a bargain, and there are a few other 4in units I'd rather have -but I've seen worse.
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Last edited by Scottmoose; 6th January 2016 at 04:17 PM.
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Old 6th January 2016, 04:26 PM   #5
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I talked to Guide Sound lately.

Pretty much everything is now made from factories in mainland China. Most of the offices were also relocated to China.

I'm a little sad about that, but that's how it works these days....
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Old 6th January 2016, 04:29 PM   #6
xrk971 is offline xrk971  United States
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Do you have these units Perceval? Was it formerly made in Taiwan?
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Old 6th January 2016, 05:13 PM   #7
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I'm not Perceval, but as I recall, Guide Sound were started & based in Taiwan for many years. I didn't know they'd been largely relocated. A shame.
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Old 6th January 2016, 05:15 PM   #8
xrk971 is offline xrk971  United States
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Taiwan makes excellent drivers in general. Lots of my in house Dayton that I really like are stamped Taiwan.
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Old 6th January 2016, 05:40 PM   #9
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Yes, Guide Sound was a Taiwan based company, but they have since moved production and most of their offices to China. For your info: About

No, I do not have those units. I don't know if they were ever produced in Taiwan before, but unless that model is a few years old, then I would venture it was never produced here.

Unfortunately, Taiwan is losing a lot of factories to China.

Another case is Tang Band. A successful taiwanese company that has moved its production to China. Taiwan is still holding on the the head office... but for how long?
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Old 6th January 2016, 05:46 PM   #10
chrisb is offline chrisb  Canada
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As a former member of the manufacture's forum who is still active in the business would likely assert - with appropriate QC and design, the provenance of production should almost not matter.

Unfortunately that perfect world is a fairy tale, so YMMV

Having said that, a couple of years ago I made a bespoke pair of enclosures for another forum member for a pair of Airborne "wood" ( i.e. reconstituted veneer) coned units. The drivers were quite nicely built, and sounded great - excellent bass. While not capable of the same insane party levels as some of his larger PA systems, I think mr W might still be playing them at more intimate levels- I'm sure I saw some Barry White in his collection, buried behind the JB.

No, I made that last part up.

Or did I, Cal?
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