{"id":5140,"date":"2015-05-16T10:13:54","date_gmt":"2015-05-16T10:13:54","guid":{"rendered":"http:\/\/www.audioexcite.com\/?page_id=5140"},"modified":"2015-10-23T18:53:59","modified_gmt":"2015-10-23T18:53:59","slug":"seas-h1152-ca12rcy","status":"publish","type":"page","link":"https:\/\/www.audioexcite.com\/?page_id=5140","title":{"rendered":"SEAS H1152 CA12RCY"},"content":{"rendered":"

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

 <\/p>\n

\"CA12RCY\"<\/a><\/p>\n

The CA12RCY is a 4.5″ mid-woofer from the Seas Prestige series. It uses a handcoated paper cone with coated fabric dust cap and a natural rubber surround,which reduce resonances and distortion.<\/p>\n

The large magnet system and a symmetrical driving force accomplished through a special coil winding technique for the voice coil gives an excellent linearity.<\/p>\n

Very large magnet system provides a reasonable efficiency and a low Q. Extremely stiff and stable injection moulded metal basket keeps the critical components in perfect alignment.<\/p>\n

Large windows in the basket both above and below the spider reduce sound reflexion, air-fl ow noise and cavity resonance to a minimum.<\/p>\n

SEAS spec sheet: CA12RCY<\/a><\/p>\n

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

 <\/p>\n

\"T-S<\/a><\/p>\n

Slightly higher voice-coil resistance and sensitivity than the official specification.<\/p>\n

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

 <\/p>\n

\"CA12RCY-Imp-1L-vs-2R\"<\/a><\/p>\n

Minor wrinkles in the impedance plot between 0.8-1,5kHz.<\/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\u00d730,5cm with 12mm round-over on the baffle edges (r=12).
\nDriver position:<\/strong> Mounted on center-line with driver unit center 20,2cm from the top of the baffle.
\nMic position:<\/strong> 1m distance, on mid-woofer-axis.
\nSmoothing:<\/strong> 1\/24 octave smoothing applied.<\/p>\n

\"CA12RCY-Freq-0deg-1L-vs-2R-tw-axis\"<\/a>\"CA12RCY-Freq-15deg-1L-vs-2R-tw-axis\"<\/a><\/p>\n

(click on picture to zoom)<\/p>\n

Left:<\/strong> Frequency response on-axis (Blue=sample#1 Red=sample#2).
\nRight:<\/strong> Frequency response 15deg off-axis (Blue=sample#1, Red=sample#2).<\/p>\n

The two mid-woofer samples measures virtually the same. The hump between 500 and 1.1kHz is due to the effects of the test enclosure’s baffle step. There is no sign of any cone edge resonance and the frequency response is very smooth up to 4.5kHz with a gentle roll-off from 1.5kHz. A small cone break-up is visible around 6.5kHz.<\/p>\n

\"CA12RCY-Freq-0-15-22.5deg-1L\"<\/a><\/p>\n

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

\"CA12RCY-Freq-30-45-60deg-1L\"<\/a><\/p>\n

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

The mid-woofer starts to roll-off at 3.5kHz and has a very smooth\u00a0 frequency response.<\/p>\n

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

 <\/p>\n

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