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Low Earth Orbit
DIY Audio
60 Degree DIY Mid Hi - AKA PM60
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<blockquote data-quote="Peter Morris" data-source="post: 141597" data-attributes="member: 652"><p>Re: 60 Degree DIY Mid Hi</p><p></p><p><span style="font-family: 'Calibri'"><span style="color: #000000"><span style="font-size: 12px">FWIW as I understand the 118 dB sensitivity figure for a 4592 was measured on a large 40x 20 horn with a 300Hz cut off. I don't know what they used for the 4594.</span></span></span></p><p><span style="font-family: 'Calibri'"><span style="color: #000000"><span style="font-size: 12px"></span></span></span></p><p><em><span style="font-family: 'Calibri'"><span style="color: #000000"><span style="font-size: 12px">BMS – 2242 2” CD Horn– 300Hz, 40 x 20 467 x 467 x 467</span></span></span></em></p><p></p><p><span style="font-family: 'Calibri'"><span style="color: #000000"><span style="font-size: 12px">I assume they used it because it’s the only horn they manufacture with a 300Hz cut off and the driver was rated to 300Hz.</span></span></span></p><p><span style="font-family: 'Calibri'"><span style="color: #000000"><span style="font-size: 12px"></span></span></span></p><p><a href="http://www.bmsspeakers.com/index.php?id=4592nd_curves" target="_blank"><span style="font-family: 'Calibri'"><span style="font-size: 12px"><span style="color: #0000ff">http://www.bmsspeakers.com/index.php?id=4592nd_curves</span></span></span></a><span style="font-family: 'Calibri'"><span style="font-size: 12px"><span style="color: #000000">– these results (about 112 dB) are measured on a more typical 90 x 55 degreehorn </span></span></span><a href="http://www.bmsspeakers.com/index.php?id=2230_specification" target="_blank"><span style="font-family: 'Calibri'"><span style="font-size: 12px"><span style="color: #0000ff">http://www.bmsspeakers.com/index.php?id=2230_specification</span></span></span></a></p><p></p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Calibri'">This is exactly what you would expect … about 6 dB less. It is also exactly in line with most other typical compression drivers. One thing the BMS does have is a very efficient VHF section. To do that they have made a driver with a very high resonant frequency and it <strong>will not</strong> go below 6kHz </span></span></span></p></blockquote><p></p>
[QUOTE="Peter Morris, post: 141597, member: 652"] Re: 60 Degree DIY Mid Hi [FONT=Calibri][COLOR=#000000][SIZE=3]FWIW as I understand the 118 dB sensitivity figure for a 4592 was measured on a large 40x 20 horn with a 300Hz cut off. I don't know what they used for the 4594. [/SIZE][/COLOR][/FONT] [I][FONT=Calibri][COLOR=#000000][SIZE=3]BMS – 2242 2” CD Horn– 300Hz, 40 x 20 467 x 467 x 467[/SIZE][/COLOR][/FONT][/I] [FONT=Calibri][COLOR=#000000][SIZE=3]I assume they used it because it’s the only horn they manufacture with a 300Hz cut off and the driver was rated to 300Hz. [/SIZE][/COLOR][/FONT] [URL="http://www.bmsspeakers.com/index.php?id=4592nd_curves"][FONT=Calibri][SIZE=3][COLOR=#0000ff]http://www.bmsspeakers.com/index.php?id=4592nd_curves[/COLOR][/SIZE][/FONT][/URL][FONT=Calibri][SIZE=3][COLOR=#000000]– these results (about 112 dB) are measured on a more typical 90 x 55 degreehorn [/COLOR][/SIZE][/FONT][URL="http://www.bmsspeakers.com/index.php?id=2230_specification"][FONT=Calibri][SIZE=3][COLOR=#0000ff]http://www.bmsspeakers.com/index.php?id=2230_specification[/COLOR][/SIZE][/FONT][/URL] [SIZE=3][COLOR=#000000][FONT=Calibri]This is exactly what you would expect … about 6 dB less. It is also exactly in line with most other typical compression drivers. One thing the BMS does have is a very efficient VHF section. To do that they have made a driver with a very high resonant frequency and it [B]will not[/B] go below 6kHz [/FONT][/COLOR][/SIZE] [/QUOTE]
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