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Junior Varsity
Step-Down Mode on EV TL15-2
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<blockquote data-quote="Art Welter" data-source="post: 218194" data-attributes="member: 52"><p>The TL-15 is already over -8dB at it's tuning frequency (Fb) of 40Hz.</p><p>Covering ports to drop the tuning to 28Hz will drop the response about another -6dB , requiring four times the power to compensate.</p><p></p><p>If you are using the cabinets for anything other than a home stereo, the additional boost required for anything near flat response will make the speakers run out of excursion 1/3 octave up from Fb.</p><p></p><p>As well as that, covering ports increases "port compression", the air will literally be blown out of them at high drive levels, no longer functioning at Fb.</p><p></p><p>Upgrading speakers would require much larger and longer ports to avoid port compression.</p></blockquote><p></p>
[QUOTE="Art Welter, post: 218194, member: 52"] The TL-15 is already over -8dB at it's tuning frequency (Fb) of 40Hz. Covering ports to drop the tuning to 28Hz will drop the response about another -6dB , requiring four times the power to compensate. If you are using the cabinets for anything other than a home stereo, the additional boost required for anything near flat response will make the speakers run out of excursion 1/3 octave up from Fb. As well as that, covering ports increases "port compression", the air will literally be blown out of them at high drive levels, no longer functioning at Fb. Upgrading speakers would require much larger and longer ports to avoid port compression. [/QUOTE]
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Step-Down Mode on EV TL15-2
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