{"id":447,"date":"2011-10-17T11:51:14","date_gmt":"2011-10-17T09:51:14","guid":{"rendered":"http:\/\/www.audioexcite.com\/?page_id=447"},"modified":"2011-11-21T15:55:25","modified_gmt":"2011-11-21T15:55:25","slug":"scanspeak-d2608913000","status":"publish","type":"page","link":"https:\/\/www.audioexcite.com\/?page_id=447","title":{"rendered":"ScanSpeak D2608\/913000"},"content":{"rendered":"

\u00a0Overview:<\/strong><\/span><\/h3>\n

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\"\"<\/a>The D2608\/913000 is a tweeter from the ScanSpeak\u00a0 Discovery series. It’s essentially the same tweeter as the famous Peerless “HDS” tweeter, but nowadays its built by ScanSpeak . It plays in a division higher tan the other “Discovery” tweeters, almost like the “Revelator” or “Illuminator” tweeter series.<\/p>\n

It offers a very sturdy build quality with a metal faceplate and a double magnet system.<\/p>\n

It uses ferrofluid combined with\u00a0 a fully vented motor system for low compression and it has a fairly low resonance frequency. This is a low distortion tweeter an can be used as low as 1500Hz.<\/p>\n

ScanSpeak Spec sheet: D2608\/913000<\/a><\/p>\n

T\/S Parameters:<\/strong><\/span><\/h3>\n

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\"\"<\/a>About 10% higher fs than official spec sheets. Not a perfect match between the two samples, but within limits.<\/p>\n

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Impedance:<\/span><\/strong><\/h3>\n

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Free air impedance measurement:<\/p>\n

Sample 1 = Green<\/p>\n

Sample 2 = Blue<\/p>\n

Thanks to ferrofluid in the magnetic gap, a shallow impedance peak around fs. The two sample are a reasonable close match.<\/p>\n

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Frequency:<\/span><\/strong><\/h3>\n

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Frequency measurement conditions:<\/strong><\/p>\n

The tweeter is measured mounted on a 14 liter Dayton Audio enclosure (PartsExpress part #302-721) baffle with the following conditions:<\/p>\n

Baffle size (WxH):<\/strong> 21,59×35,56cm (8,5″x14″)<\/p>\n

Driver position:<\/strong> Mounted on center-line with driver unit center 8cm from the top of the baffle.<\/p>\n

Mic position:<\/strong> 1m distance, on tweeter-axis.<\/p>\n

Smoothing:<\/strong> No smoothing applied.<\/p>\n

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Not a perfect match between the two samples in the higher octaves. Sample 2 has a broad dip around\u00a0 15kHz, but instead has a frequency response up to 30kHz!<\/p>\n

In the cross-over region they measure essentially the same.<\/p>\n

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Sample 1<\/p>\n

0deg = Blue<\/p>\n

15deg = Red<\/p>\n

22.5deg = Green<\/p>\n

Baffle diffraction around 3.5kHz which as expected flattens out off-axis. Nice extended frequency response and off-axis dispersion.
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Sample 1<\/p>\n

0deg = Blue<\/p>\n

15deg = Red<\/p>\n

30deg = Green<\/p>\n

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Sample 1<\/p>\n

0deg = Blue<\/p>\n

30deg = Red<\/p>\n

45deg = Green<\/p>\n

Even at 45deg off-axis this tweeter reaches 15kHz!<\/p>\n

Distortion:<\/strong><\/strong><\/span><\/h3>\n

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The distortion measurements are done in near-field and the amplifier output level was adjusted for the driver unit so that the fundamental is 85dB at 1m and 90dB at 1m. This setting simulates normal to medium-high listening levels.<\/p>\n