{"id":1000,"date":"2011-11-09T19:20:05","date_gmt":"2011-11-09T19:20:05","guid":{"rendered":"http:\/\/www.audioexcite.com\/?page_id=1000"},"modified":"2015-05-17T11:45:05","modified_gmt":"2015-05-17T11:45:05","slug":"seas-e0021-w12cy001","status":"publish","type":"page","link":"https:\/\/www.audioexcite.com\/?page_id=1000","title":{"rendered":"SEAS E0021 W12CY001"},"content":{"rendered":"

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

 <\/p>\n

\"\"<\/a>The W12CY001 is a mid-woofer from the Seas Excel series. It uses a surface treated magnesium cone coupled to a natural rubber surround and showing no signs of the commonly midrange edge resonances. The extremely stiff and light cone gives tremendous bass precision and midrange detail.<\/p>\n

Heavy copper rings are mounted above and below the T-shaped pole piece and reduces the non-linear and modulation distortion and increase the overload margin.<\/p>\n

An extra-large magnet system is used for good sensitivity and transient response as well as copper plating of the top and bottom plates and a solid copper phase plug, which enhance the performance of the copper rings and improve heat conduction away from the pole piece.<\/p>\n

This driver is one of the very best small mid-woofers on the market in its class. For its size it has great woofer capabilities and has an overall smooth frequency response characteristic up to the cone break-up at 10kHz. This cone break-up needs to be taken special care of with a special notch filter in the cross-over filter design. Failure to take care of the cone break-up results in a driver unit with a very fatiguing sound and that \u201crings like a bell\u201d.<\/p>\n

This loudspeaker driver unit needs to be crossed over low in frequency in order to keep the odd order harmonics distortion at bay. I recommend a cross-over <2500Hz.<\/p>\n

SEAS spec sheet: W12CY001<\/a><\/p>\n

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

 <\/p>\n

\"\"<\/a>T\/S parametrs are measured both when the driver unit are cold and when warmed up with a 1 hour stress stimulus\u00a0 at 5.66V (4W\/8\u03a9). The warmed up driver units are rested for 2-3 minutes before they are measured.<\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

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

 <\/p>\n

\"\"<\/a><\/p>\n

Free air impedance measurement “cold” driver units:<\/p>\n

Sample 1 = Green<\/p>\n

Sample 2 = Blue<\/p>\n

The samples are an almost perfect match between eachother and they have a very smooth impedance response curve with no signs of any resonances besides the cone break-up at 10kHZ<\/p>\n

 <\/p>\n

\"\"<\/a><\/p>\n

Free air impedance measurement “hot” driver units:<\/p>\n

Sample 1 = Green<\/p>\n

Sample 2 = Blue<\/p>\n

The Fs is lowered by 4-5Hz, but otherwise they have the same smooth response curve as the “cold” driver units.<\/p>\n

 <\/p>\n

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

 <\/p>\n

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

The mid-woofer is measured mounted in a 8 liter Dayton Audio enclosure (PartsExpress part #302-701) baffle with the following conditions:<\/p>\n

Baffle size (WxH):<\/strong> 19,05×30,48cm (7,5\u2033x12\u2033)<\/p>\n

Driver position:<\/strong> Mounted on center-line with driver unit center 10cm from bottom of the baffle.<\/p>\n

Mic position:<\/strong> 1m distance, 12.2cm above driver unit center (tweeter-axis)<\/p>\n

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

\"\"<\/a><\/p>\n

0deg tweeter-axis
\nSample 1 = Blue
\nSample 2 = Red<\/p>\n

Nice consistency between the two driver unit samples. Downwards sloping frequency response from 2kHz. Heavy cone break-ups at 10kHz, 13.5kHz and above.The cone break-up at 10kHz needs to be corrected for with a notch-filter in the cross-over.<\/p>\n

\"\"<\/a><\/p>\n

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

\"\"<\/a><\/p>\n

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

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

 <\/p>\n

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