Riot260 Posted December 16, 2009 Share Posted December 16, 2009 The wife won't let me keep my Heresys for back channel speakers. Too big. I can't complain too much since she hasn't freaked over the fronts. Thus I have decided to attemp and 8" build. I found an 8" Eminence driver Alpha-8A. Looks identical only smaller. But looks can be deceiving. 8" specs: *Power handling: 125 watts RMS *VCdia: 1.5" *Le: 0.44 mH *Impedance: 8 ohms *Re: 5.3 ohms *Frequency range: 58-5,000 Hz *Magnet weight: 20 oz. *Fs: 73 Hz *SPL: 94 dB 1W/1m *Vas: 0.6 cu. ft. *Qms: 4.60 *Qes: 0.68 *Qts: 0.59 *Xmax: 3.2 mm *Dimensions: Overall Diameter: 8.24", Hole Diameter: 7.13", Mounting Depth: 3.58". Kapton coil former Polyamide-imide coated copper voice coil Ferrite magnet Pressed steel basket Paper cone Cloth accordian surround Solid composition paper dust cap I figure the horns don't care about the box size and they will retain their x-over point. Whatever the 8" doesn't handle in the bottom end will be my concession. That is what the sub is for anyway. My math which is probably pretty basic and where I need some assistance. I was simply multiplying my Heresy dimensions by 0.6667". Simple math 12" to 8". Though I'm not sure whether this will be way too small or just close enough. I'd be going from approximately a 1.9 cf box to a 1.3 cf box. Can't go any smaller than 18 1/2 H & 12 W to accomodate the horns and woofer only leaving the depth which should calculate to 8 3/4 but........the horn is too deep at 11 1/8" by itself. At this point all I can do is make up 1.25" by surface mounting the mid (countersunk into the motherboard) and 1/2" by counter sinking the magnet into the back. Well so much for a square cabinet. I'll have to build it 5 or 6 sided similar to a "reference Heresy" so it will fit tighter into the ceiling. I may just build a "reference Heresy"; mount it and ask for forgiveness!?! I planned to use 3/4"MDF and black ash veneer to match the front speakers. Any thoughts or recommendations would be great! Quote Link to comment Share on other sites More sharing options...
cfelliot Posted December 16, 2009 Share Posted December 16, 2009 The spec sheet for the Eminence Alpha-8A states a 0.25 ft^3 enclosure if sealed and a little over 1 ft^3 if vented. Quote Link to comment Share on other sites More sharing options...
djk Posted December 17, 2009 Share Posted December 17, 2009 A much better choice: http://www.madisound.com/catalog/product_info.php?manufacturers_id=150&products_id=849 Quote Link to comment Share on other sites More sharing options...
Riot260 Posted December 18, 2009 Author Share Posted December 18, 2009 The only reason I was going with the Eminence was to keep the origninal look and style of the Heresy. Looking at KGs now. Thanks for the input and Happy Holidays to all! Quote Link to comment Share on other sites More sharing options...
djk Posted December 19, 2009 Share Posted December 19, 2009 The stated driver in my post would perform more like the woofer in an RB-75. Quote Link to comment Share on other sites More sharing options...
kg4guy Posted December 19, 2009 Share Posted December 19, 2009 A much better choice: http://www.madisound.com/catalog/product_info.php?manufacturers_id=150&products_id=849 Would these work in KG4's ? [^o)] Quote Link to comment Share on other sites More sharing options...
Riot260 Posted December 20, 2009 Author Share Posted December 20, 2009 Project scrapped ISO Klipsch surrounds.......have a line on a couple pairs Thanks Happy Holidays to all! Quote Link to comment Share on other sites More sharing options...
djk Posted December 20, 2009 Share Posted December 20, 2009 "Would these work in KG4's ?" No/yes, you would want the 8 ohm version: http://www.madisound.com/catalog/product_info.php?manufacturers_id=150&products_id=848 Warning: these may be a little more efficient than the original drivers. Quote Link to comment Share on other sites More sharing options...
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