A friend of mine is
seriously in love with the Vifa XT25TG-30-04 and asked me
to do the Ellam speaker with this tweeter. So, once more
the 15Ws were back in the Ellam test cabs.
2009: The Ellam XT was
made around Dec. 2006 and after some two years on the
web, this Ellam XT turns out to be one of the most
popular speakers on this website - and for good reasons:
- fairly low cost due to the excellent and cheap XT25TG
tweeter
- easy cabinet construction and fairly easy crossover
layout
- probably the best bass performance on the market from a
10 liter cabinet volume
- 15W has a smooth midrange and a smooth upper roll-off
that makes crossover construction easy
- generally high WAF depending on your skills in cabinet
making
- I could go on...this 15W driver is a winner.
Cabinets
No changes to the cabinet, vent tuning or
placement of drivers.
Details to be found at Ellam
page.
The
Crossover
Only a few changes compared to the Ellam
9800 version.
If you cannot get a 3.0 mH coil, un-wind 3.3 mH to 3.0 mH
- or leave it at 3.3 mH, only very small difference.
18.2 uF = 10 + 8.2 in parallel.
12.2 uF = 10 + 2.2 uF in parallel.
13.3 uF = 10 + 3.3 uF in parallel.
(I have these questions)
The
Crossover Kit
Crossover kits available from Jantzen Audio: contact@jantzen-audio.com
Order Superior Z-caps or Standard Z-cap
version.
(I'm
more than serious about suggesting the very best super
caps for this speaker, but be prepared for adding volume
to accommodate huge caps)
 
All components were mounted on a piece of mahogany board.
No lay-out will be given this time.
Measurements:
 
Left: SPL for 2.8V/1m. Right: Horizontal dispersion at
0°, 10°, 20°, 30° and 40°.
 
Left: Left and right speaker from finished crossovers.
Right: Impedance of finished system.
 
Left: Impedance again showing 5 ohms minimum. Right: Red
= inverted tweeter polarity from tweeter height, 1m.
As always, the XT25TG excels in a smooth, un-coloured
treble and
should you not - for some reason - like alu-domes, this
may be an option.
Back to intro
page.
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