Making of M1
By Man-Sun Huh
20 Jan 1998
System Introduction
2-Way closed box speaker with Scan-speak units. This speaker system is designed for near field monitoring in small rooms ("M" for M1 means Monitor) and for reproducing clear images. I selected a closed box system. Though "M1" has restricted bass, it can deliver more articulate bass response than any other bass-reflex system. In my room (about 20 square meters), it can play chamber music, jazz and pop with satisfaction Fig. 1. Picture of the M1.
Units
Woofer: Scan-speak 18W/8545 7" paper cone with carbon fiber
This ia an amazing mid-bass unit from Scan-speak Fig. 2. The drivers. It has a sufficiently low bass response and makes me possible to make a closed box system. Its sound is very clear and wide in midrange but need some network technique to control some gentle bump (300-1000 Hz) in the midrange. This unit and some revised versions are used in many well known commercial speaker systems (Wilson WATT5, ProAc 2.5 etc.). The Thiele-Small parameters of specification and test results are:
Parameter Listed Measured
-----------------------------------------------
Sensitivity (dB/1m 2.83V) 88.0 87.8
Free air resonance (Hz) 28.0 31.6
B x L (Tm) 7.2 7.9
Moving mass (g) 19.0 21.7
Qms 2.41 2.35
Qes 0.35 0.39
Qts 0.31 0.34
Vas (Liter) 54.0 37.1
Tweeter: Scan-speak D2905/9300 28mm soft dome
It's another amazing tweeter from Scan-speak Fig. 2. The drivers. And It's updated version of the legendary D2905/9000. Though not cheap, I can say it has very high cost performance. It's dynamic range is beyond expectation for soft dome and well match with 18W/8545.
|
Top
