{"id":1905,"date":"2012-05-06T06:12:13","date_gmt":"2012-05-06T06:12:13","guid":{"rendered":"http:\/\/www.audioexcite.com\/?page_id=1905"},"modified":"2020-11-28T12:32:08","modified_gmt":"2020-11-28T12:32:08","slug":"scanspeak-d3004664000","status":"publish","type":"page","link":"https:\/\/www.audioexcite.com\/?page_id=1905","title":{"rendered":"ScanSpeak D3004\/664000"},"content":{"rendered":"

Overview:<\/span><\/h3>\n

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The D3004\/664000 is a 4\u03a9 tweeter from the ScanSpeak Illuminator series. It\u2019s virtually the same tweeter as the D3004\/660000, but uses a very exclusive (expensive) 1\u201d dome diaphragm made of 99% beryllium instead of a 1\u201d textile dome.<\/p>\n

It offers a very sturdy build quality with a rubber coated metal faceplate. Its large roll surround and textile dome diaphragm provides a frequency response to 40KHz with outstanding off-axis dispersion and low distortion.<\/p>\n

The unique AirCirc Magnet System and its rear chamber results in elimination of reflections and resonances that compromise the performance of traditional motors.<\/p>\n

This very nice tweeter not only measures well, but also sounds great and is capable of low cross-over points.<\/p>\n

ScanSpeak Spec sheet: D3004\/664000<\/a><\/p>\n

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

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\"\"<\/a>Nice consistency between the samples and almost the same resonance frequency as the manufacturers specification.<\/p>\n

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

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\"\"<\/a>Free air impedance measurement:
\nSample 1 = Green
\nSample 2 = Blue<\/p>\n

A perfect match between the two samples.<\/p>\n

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

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

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

Baffle size:<\/strong> (WxH): 21,59\u00d735,56cm (8,5\u2033x14\u2033)<\/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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0deg tweeter-axis
\nSample 1 = Blue
\nSample 2 = Red<\/p>\n

Virtually the same frequency response between the two samples. At 3.5kHz the baffle diffraction is noticed as a dip in the frequency response. This dip is reduced in the off-axis measurements. The tweeter has a slightly dropping top-end frequency response from 15kHz to 25kHz. Very extended frequency response in both ends.<\/p>\n

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0deg = Blue
\n15deg = Red
\n22.5deg = Green<\/p>\n

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30deg = Blue
\n45deg = Red
\n60deg = Green<\/p>\n

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

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Measurement setup:<\/span><\/strong><\/p>\n