Fostex or Jordan jxr 6hd for T-Amp? - diyAudio
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Old 15th February 2007, 11:39 PM   #1
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Default Fostex or Jordan jxr 6hd for T-Amp?

I am building a system based around a Charlize T-Amp, but I have not decided which speakers to build.
I have pretty much concluded that I will need an active subwoofer, which I am assembling the parts for.
My main requirements is that they will be small, so bass reflex or sealed, I guess.
The listening room will not be large.
The listening volume will not need to be "party Level".
I am looking for an exquisite sound - of course.
I had been looking at the Fostex FE167E, but then I came across the Jordan Jxr 6hd, which are very different, of course. The Jordans can go in a small 4 litre cabinet which can be wall mounted, which is interesting.
Any other suggestions?
My budget is up to 150 for the drivers, but I would be happy to spend a lot less, as low budget is a fun goal for thjis project.
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Old 16th February 2007, 08:52 AM   #2
Colin is offline Colin  United Kingdom
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I have the JXR6 drivers and they work well with the little Sonic T-amp. They're a 4 ohm driver, getting around 9 watts out of the amp. The combination brings out the best in each component and, of course, there's no bass below 80Hz to strain the t-amp.

If going for the Jordans, you can use an enclosure smaller than 4 litres. 3 litre is the optimum according to the website but mine are in 2.2 litre Homebase ceramic pots and only lose a few Hz extension in the bass at the expense of slightly higher Qts. You can go as small as 0.75 litre.
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Old 16th February 2007, 09:33 AM   #3
Puffin is offline Puffin  United Kingdom
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I have just built a back loaded horn using a Fostex 206E. I use a modified T-Amp and the combination in my opinion is astounding. For the cost of the modified T-Amp (50) and Fostex + cabs (400) I think you would need to spend a whole bucket load more to get the same resolution, musicality, tangibility and sheer grin factor. You just want to keep turning it up to hear and (see)deeper into the mix. The sound is very live, but not harsh or uncontrolled.
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Old 16th February 2007, 10:49 AM   #4
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Thank you for your replies.
I would love to build some horns, they are definitely the way to go to get the best from FRs, but in this intstance I need small cabinets.
Are there any opinions in the difference in sonics between small BR Fostexs and the Jordan JXR 6HDs?
I am open to all suggestions, and my decision is not limited to the above.
Michael
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Old 16th February 2007, 12:43 PM   #5
Colin is offline Colin  United Kingdom
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The Jordan needs a sealed box and is designed to work with a bass system (although it does pretty well on its own). My system is tuned to f3 at 120Hz and output disappears completely below 80Hz. Wall or corner mounting helps fill out the lower midrange. Imaging is top class and, as I've said before, the overall sound is electrostatic in character, lots of detail, very fast.

The Jordan JX92 has a ported box design which may compare more directly with the Fostex.
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Old 16th February 2007, 09:52 PM   #6
jzagaja is offline jzagaja  Poland
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Colin - have you tried giving as small air as possible for the Jordans? I've talked with Doreen Bance and she don't like the strong bass transient without HP filter. Actually I didn't understand her correctly - she doesn't use any filter does she? She promised me Bandor 300 spec within few weeks.
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Old 17th February 2007, 04:38 PM   #7
Puffin is offline Puffin  United Kingdom
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My 206 BLHClick the image to open in full size.
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Old 19th February 2007, 10:06 AM   #8
Colin is offline Colin  United Kingdom
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>Colin - have you tried giving as small air as possible for the Jordans?

Ted's units have a different suspension to the Bandors and the 2-3 litre enclosures are fine. Ted actually recommends you don't stick a cap in series to roll of the LF as it will do a worse job than allowing the enclosure to do it. The various alignments and bxes sizes are here.
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Old 19th February 2007, 10:23 AM   #9
jzagaja is offline jzagaja  Poland
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The problem without filtration of JXR6 is that I'm getting too long cone excursion on the strong bass transients. I'm using 2 litre enclosure that is now not perfectly sealed. I would like to use Bandor 150, 300 or Edyton 8" (kevlar, Mms 20g) around 200Hz.
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Old 19th February 2007, 11:14 AM   #10
Colin is offline Colin  United Kingdom
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Properly sealing the enclosure will considerably reduce cone excursion at LF.

I think the Bandor Trident system uses the smaller units without any filters. In fact, as the bass unit is a bandpass system, I don't think there are electrical filters anywhere in the system.
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