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Low Earth Orbit
DIY Audio
Comparing LF drivers
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<blockquote data-quote="Michael John" data-source="post: 8861" data-attributes="member: 830"><p>Here's a, probably naive, question for the seasoned speaker designers lurking here...</p><p></p><p>Recently I've spent way too much time looking at spec sheets for 15", 18" and 21" drivers - JBL, B&C, BMS, 18sound etc. - and one way I've tried to compare the drivers is to plot their 1W freq responses scaled up by 10xlog10 of the AES rated power. (Yes, I know this doesn't account for suspension and temperature compression effects, and final cabinet design.)</p><p></p><p>With the large number of multi 1000 watt drivers out now, I expected to see major differences between these calculated SPL freq responses. Instead I find they're all more similar than different, and the 21" drivers have only fractionally more output at the low end than some of the 18" drivers.</p><p></p><p>However, one stand-out is the old JBL 2242H (18", 800W, ferrite) which shows a clear 4 to 5 dB higher output below 100 Hz than many of the newer drivers. It has a much lighter cone at about 158 grams: compare to the B&C 18SW115 (18", 1700W, neo) cone at about 275 grams.</p><p></p><p>So I'm wondering, what are the major advantages of the multi 1000 watt drivers? A clear disadvantage is the need for much higher power, and higher voltage (for 4 and 8 ohm) amplifiers.</p></blockquote><p></p>
[QUOTE="Michael John, post: 8861, member: 830"] Here's a, probably naive, question for the seasoned speaker designers lurking here... Recently I've spent way too much time looking at spec sheets for 15", 18" and 21" drivers - JBL, B&C, BMS, 18sound etc. - and one way I've tried to compare the drivers is to plot their 1W freq responses scaled up by 10xlog10 of the AES rated power. (Yes, I know this doesn't account for suspension and temperature compression effects, and final cabinet design.) With the large number of multi 1000 watt drivers out now, I expected to see major differences between these calculated SPL freq responses. Instead I find they're all more similar than different, and the 21" drivers have only fractionally more output at the low end than some of the 18" drivers. However, one stand-out is the old JBL 2242H (18", 800W, ferrite) which shows a clear 4 to 5 dB higher output below 100 Hz than many of the newer drivers. It has a much lighter cone at about 158 grams: compare to the B&C 18SW115 (18", 1700W, neo) cone at about 275 grams. So I'm wondering, what are the major advantages of the multi 1000 watt drivers? A clear disadvantage is the need for much higher power, and higher voltage (for 4 and 8 ohm) amplifiers. [/QUOTE]
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