Tractrix Midrange Horn, the loudspeaker drive units in use for the last few years are the SEAS FA22RCZ.
This driver is inexpensive but materials & build quality are excellent, as you would expect from SEAS.
I have added a tweeter, a Fostex T90A. This tweeter is sensitive (106dB/W/m).
This is my room plan – 6.1m x 3.6m (20′ x 12′) – showing the ‘compound’ Mid-Basshorn cabinets:
The driver was originally a Lowther PM4. (Very costly and high maintenance. Now, I am using the inexpensive Seas FA22RCZ.)
described previously, a Tractrix front horn produces midrange frequencies above 140-180Hz. An Exponential rear horn provides the low frequencies. Continue reading
Mauhorn IV cabinets have found a new home!
Travelling 600km to a nice music system near Wellington, New Zealand.
The new drivers installed are
Tang Band W8-1772 full-range drivers.
I understand that these drivers are excellent.
This is a ‘compound’ horn… a single driver, with a midrange front-horn and back-loaded with a bass-horn.
13 April 2014 post, you can see the fibre-glass Tractrix Midrange Horn, which was designed for a ‘cut-off frequency’ Fc=140Hz.
The Bass-horn therefore needs to operate from 180-140Hz down to around around Fc=30Hz.
The Mauhorn was designed by Andreas Mau, a German Lowther enthusiast, in around 1995
Actually, Andreas designed 2 similar Mauhorns at that time – the Mauhorn IV (shorter 3.5m long horn, larger driver chamber) and the Mauhorn V (longer 4.5m long horn, smaller driver chamber).
This is the story of the round, midrange horns pictured and their (part) DIY construction in Fibreglass.