To achieve a flatter frequency response a wave trap is added.
Excerpt of the K+T 6/2005 review:
..."After a few CD tracks we removed the wave trap as a try, achieving a sound
with more presence that seemed to be better. "Wait a minute, I'll grab a valve
amp!" said the LP guy and minutes later carted a formidable contender into
the listening room. Due to its high efficiency Das Viech made contact without
any problem and showed a somewhat more balanced sound compared with the transistor."....
..."This configuration, however, didn't prove to be universal, some tracks
just wouldn't click. Here the wave trap was one step ahead again. The colleagues
that entered the listening room now and then, were quite impressed by The
Beast's qualities, especially when the price was mentioned."
Order No. str-viech, price per unit (without cabinet) EUR 67,26 excl. VAT: € 57.98 / $ 67.84
Order No. str-viech-he, price per unit (without cabinet) EUR 86,17 excl. VAT: € 74.28 / $ 86.91
If you prefer to make up the kit yourself:
Price of the just the Beyma 8ag/n full range driver with 8 Ohm: EUR 47,76 excl. VAT: € 41.17 / $ 48.17
Home K+T Overview