{"id":1002,"date":"2011-11-09T19:20:33","date_gmt":"2011-11-09T19:20:33","guid":{"rendered":"http:\/\/www.audioexcite.com\/?page_id=1002"},"modified":"2013-12-05T19:44:18","modified_gmt":"2013-12-05T19:44:18","slug":"dayton-audio-rs28f-4","status":"publish","type":"page","link":"https:\/\/www.audioexcite.com\/?page_id=1002","title":{"rendered":"Dayton Audio RS28F-4"},"content":{"rendered":"

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

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

 <\/p>\n

The RS28F-4 is a 4\u03a9 tweeter from the Dayton Audio Reference series.<\/p>\n

It offers a very sturdy build quality with a metal faceplate and a grill covering the silk dome.<\/p>\n

It has a tuned rear chamber, supported by a rugged diaphragm assembly. It has excellent power handling and a low-distortion motor system with a lot of copper in the right places. It has a low free-air resonance and it supports very low crossover points (1200-1500Hz), depending on the used filter design.<\/p>\n

This very nice tweeter not only measures well, but also sounds great and matches mid-woofers which need low cross-over points perfectly.<\/p>\n

Dayton Audio Spec sheet: RS28F-4<\/a><\/p>\n

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

 <\/p>\n

\"\"<\/a>An average of about 150hz higher free-air resonance than manufactorer spec sheet.<\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

Impedance:<\/strong><\/strong>\u00a0<\/span><\/h3>\n

 <\/p>\n

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

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

Sample 1 = Green<\/p>\n

Sample 2 = Blue<\/p>\n

The two samples are not a perfect match. The samples differ by 80Hz on the resonance frequency and sample 2 has a more damped resonance frequency peak.<\/p>\n

 <\/p>\n

 <\/p>\n

\u00a0Frequency:<\/strong><\/strong><\/span><\/h3>\n

 <\/p>\n

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

The tweeter 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\u00d730,48cm (7,5\u2033x12\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

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

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 rising top-end frequency response in the on-axis measurements.<\/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:<\/span><\/strong><\/p>\n