|
ScanSpeak
tweeters, D3004-660000 and D2904/710003
|
|
For future projects, a pair of 6600 and
7100 tweeters were acquired. The basic differences between these two
tweeters are the magnet system and the dome, where the 7100 has a ring
of damping glue to the dome. The ring neodym magnet of the 7100
tweeter provides a whopping 95+ dB sensitivity, suitable for fairly
high-efficiency systems where the 6600 does well up to 92 dB/2.8
volts. The 6600 display some inconsistency in sensitivity, around 1 dB
and although I don't regard this as a serious problem, a little
dissappointing. Only two units were available for the 6600 tweeter. I
had another pair of 7100 for test, hence 4 samples on display below.
All of these are consistent in sensitivity and only display minor
differences between 15-20 kHz, probably due to the damping ring
applied. I wonder why SS added the damping ring as the 6600 display
less distortion in this area compared to 7100. What makes me
wonder the most is the frequency response shown at SS website. From a
total of six 7100 units tested until today, they all display a 3-4 dB
peak around 16-17 kHz. The graphs look like a 6600 body tested with a
7100 dome and the 7100 body tested with a 6600 dome. I haven't tried
swapping domes and measure what happens. Both of these domes appear suitable for two-way systems with a very low point of crossover and from clients' project I know the 7100 can do well down to 1.5 kHz with a simple 2nd order crossover. The 7100 tweeter was tested in experimental designs and proved well down to 1.4 kHz, 12 dB/octave. Very impressive. All measurements done with tweeters flush-mounted on 35 x 50 cm baffle, center placement and 20 cm from top. An IEC baffle may provide better low-end response. |
|
D3004/660000
D2904/710003-sample #1-2
D2904/710003 sample #3-4
|
