MONACOR - SP45/8 (3" driver) - Speaker
05-Oct-05 02:14 PM

20Hz -18.00 0.00
31Hz -14.75 0.00
40Hz -9.62 0.00
50Hz -11.25 0.00
100Hz -2.62 0.00
315Hz -1.00 0.00
1k0 0.00 0.00
6k3 +0.88 0.00
10k0 +1.50 0.00
12k5 +0.50 0.00
14k0 -2.87 0.00
16k0 -7.37 0.00
20k0 -15.00 0.00
25k0 -18.00 0.00

This little speaker drive unit demonstrates the advantages of High-BL (it has a very big magnet for its size). This makes compensation down to 30Hz feasible at low levels.

As well as giving high sensitivity (88dB for 1 watt specified) this gives 'tight-coupling' resulting from back-emf feedback. This damps any bass resonance and also holds up the bottom end giving a roll-off closer to 12dB/octave than the 18db/octave otherwise expected. See the Visaton FR8 for comparison (both cost around 5 from CPC).

The roll-off above 15kHz and the large peak and dip around 2kHz make this unit more of a bass driver than a full-range device. The 2kHz anomoly is believed to demonstrate a common weakness of rubber roll surrounds - they allow long throw for bass use, but cause reflection of the compression wave travelling through the cone. Foam or paper surrounds can be designed to provide a matched impedance which absorbs energy at the edge of the cone, minimising the effect.

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