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Upgrading from Alpine type S 12"-
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<blockquote data-quote="NSTALN" data-source="post: 8496989" data-attributes="member: 588169"><p>Using the dimensions you provided minus the thickness of 3/4inch MDF you're looking at 17.5x19.5x13.5=4606.875 (cubic inches)/1728 (1 cubic foot in cubic inches)=2.66 cubic feet internal space NOT including any port/brace/speaker displacement....I think you could get a good ported box for a 12 within those limitations.</p><p></p><p>Also your question about the Type S being worth trying a nice box...it depends on the model of Tye S you're using...the older models weren't all that impressive...however the newest version is actually pretty nice. It's an underhung coil/motor design with 15mm of throw with a reasonable mounting depth and moderate power requirements...you could do a lot worse in a subwoofer.</p><p></p><p>With 1000@1ohm (or even 800@2ohms) the Type R is a good choice...segmented magnet structure that allows for better cooling, a shorting ring, 'compound-radius curve' shape on the pole piece to help 'shape' the magnetic lines of flux, 20mm of throw, specifically designed grill...and handles gobs of power.</p><p></p><p>Good news is your amp has a variable subsonic filter(15hz-40zh) which will allow you to control the unloading of your sub below the tuning frequency of a ported box.</p></blockquote><p></p>
[QUOTE="NSTALN, post: 8496989, member: 588169"] Using the dimensions you provided minus the thickness of 3/4inch MDF you're looking at 17.5x19.5x13.5=4606.875 (cubic inches)/1728 (1 cubic foot in cubic inches)=2.66 cubic feet internal space NOT including any port/brace/speaker displacement....I think you could get a good ported box for a 12 within those limitations. Also your question about the Type S being worth trying a nice box...it depends on the model of Tye S you're using...the older models weren't all that impressive...however the newest version is actually pretty nice. It's an underhung coil/motor design with 15mm of throw with a reasonable mounting depth and moderate power requirements...you could do a lot worse in a subwoofer. With 1000@1ohm (or even 800@2ohms) the Type R is a good choice...segmented magnet structure that allows for better cooling, a shorting ring, 'compound-radius curve' shape on the pole piece to help 'shape' the magnetic lines of flux, 20mm of throw, specifically designed grill...and handles gobs of power. Good news is your amp has a variable subsonic filter(15hz-40zh) which will allow you to control the unloading of your sub below the tuning frequency of a ported box. [/QUOTE]
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Upgrading from Alpine type S 12"-
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