ScanSpeak tweeters, D3004/660000, D2904/710003 and D3004/664000                      BACK TO INTRO PAGE
Copyright 2011-13 © Troels Gravesen

D3004/660000     D2904/710003      D3004/664000        


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From left: D3004/660000    D2904/710003    D3004/664000
Click above to download SS specs.
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 disappointing. 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.
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.
The 6640 Be dome was added later to my collection.

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.

The 6600 and 6640 tweeters present some challenges  with regard to crossovers, because these tweeters go so low the can play midrange! The 7100 with its steeper low-end roll-off due to the very strong magnet system is easier. Taking the 6600 and 6640 down to 2 kHz and using a 12 dB/octave filter makes it necessary to apply impedance linearisation to render a smooth roll-off profile.  

D3004/660000
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Left: SPL @ 2.8V, 1 m, unit 1 and 2. 
Right: Distortion measured at 0.25 meter, input 2.8V ~92 dB/1 meter, unit 1 and 2.


 
CSD, 2.8V.
Left: Unit 1
Right: Unit 2.

 

D2904/710003
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Left: SPL @ 2.8V, 1 m, unit 1 and 2.
Right: Distortion measured at 0.25 meter, input 2.8V ~96 dB/1 meter, unit 1 and 2.


CSD, 2.8V. Left: Unit 1. Right: Unit 2.

 

 Left: Step response, unit 1. Right: Step response unit 2.


 7100 dispersion at 0, 10,20, 30 and 40 deg.

D3004/66400 Beryllium dome
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Click image to view large. Download specs here.


SPL normalised for 1 m/2.8V, unit 1 and 2. 


Impulse response, unit 1 and 2. 


Step response, unit 1 and 2.


CSD, 25 dB, unit 1 and 2. Very clean indeed!


Left: SPL unit 1 and 2 (not normalised for 2.8V/1m). Right: Impedance unit 1 and 2.
Quite as matched pair!


Distortion from unit 1&2. Measurement at 0.25 m distance, 2.8 V. Black = 2nd harm., blue = 3rd harm.
These tweeter display significant lower distortion compared to 7100 and 6600.

I don't think I've ever had a pair of so closely matched tweeters. The have outstanding performance in my Jenzen ATS speakers.

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