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<blockquote data-quote="mlstrass" data-source="post: 8132387" data-attributes="member: 569126"><p>HDC's **** in 4th orders, suspension is too stiff, even on the newer ones.</p><p></p><p>I had best luck with 15's in 4.25^3. Try 20^2 port per cube and tune around 43-45Hz. Then use a port reducer for daily to drop tuning to around 38Hz.</p><p></p><p>If you have a 4kw amp you'll be fine for daily, if you plan to clamp 4kw then buy extra recones. I burped my alum coil HDC3's on 2 3500's at .5 numerous times with NO issues and did a few streetbeat runs also...</p></blockquote><p></p>
[QUOTE="mlstrass, post: 8132387, member: 569126"] HDC's **** in 4th orders, suspension is too stiff, even on the newer ones. I had best luck with 15's in 4.25^3. Try 20^2 port per cube and tune around 43-45Hz. Then use a port reducer for daily to drop tuning to around 38Hz. If you have a 4kw amp you'll be fine for daily, if you plan to clamp 4kw then buy extra recones. I burped my alum coil HDC3's on 2 3500's at .5 numerous times with NO issues and did a few streetbeat runs also... [/QUOTE]
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