Principle : Terminated line
Impedance : 6 Ohm
Sensivity : 88 dB (2,83 V/ 1 m)
Front - back : 2 pieces 1000 x 210 mm Side panels : 2 pieces 1000 x 256 mm Top panel : 1 piece 166 x 256 mm (with a hole for the line exit) Internal divider : 1 piece 775 x 166 mm (inclusive a 5 degree angle) Bottom panels : 1 piece 272 x 166 mm (inclusive a 20 degree angle) 1 piece 138 x 166 mm (inclusive a 20 degree angle)Damping materials:
L1 = 2,2 mH air coil
L2 = 0,39 mH air coil
C1 = 8,2 uF bipolar capacitor
C2 = 8,2 uF bipolar capacitor
C3 = 8,2 uF capacitor MKP
R1 = 5,6 Ohm/ 5 watt resistor
R2 = 2,7 Ohm/ 5 watt resistor
terminal-filter 1 x 1 m 2,5 mm OFC
filter-bass/mid 0,5 x 1 m 2,5 mm OFC
filter-tweeter 0,5 x 1 m 1,5 mm OFC
It uses a 7"Scan-Speak 8542-05 driver and a Vifa Tweeter the D27TG-35-06, in Holland also known as the HT 275D/2 (we use different numbers!). The cabinet is made according to a principle called a terminated line. I know that this is a kind of strange principle to use for such a driver but I had to come up with a reasonable amount of bass (design goal). I have also build this speaker in a bass-reflex box with a net volume of approx. 16 liters. This speaker sounded very analytical in the low freqencies but not as nice as the terminated line, it lacked a bit of natural warmth.
The terminated line which i called Transient II, has a much warmer and still very analytical bass performance. The mid is up-front but it also gives, together with the high, a lot of spaciousness. Transient performance is good. The tweeter gives a little too much at the end of the spectrum which gives the system, when used with certain electronics, a bit of bright, 'harsh' sound.
The damping material is long fiber wool or BAF-wadding (about 400 grams a cubic meter). The drawing, said wool but the BAF is easier to use because it stays in place and do not settle like the wool. The other material called 'Pritex' is a brand name. It's a kind of synthetic foam with an egg shape, it weights about 30 kg a cubic meter and has a height of about 40mm.
If you have any questions or remarks i will be pleased to reply on them.