geoffbyrne Posted August 17, 2009 Share Posted August 17, 2009 Here's the info: To make a small super-light rig, I bought an empty Ampeg Portabass 112H cab and put my Beyma K200 12" 250W @ 8 Ohms in it. There's a compression horn in place but not connected as I'm going through a Digitech GTX1 patched for bass into the Line In socket of a Crate Powerblock bridged (150W @ 8 Ohms) so it only out puts through one jack when bridged and wants 8 Ohms only - it'll protect itself and cut off at 4 Ohms. I'm not using/connected the horn as it would bring the cab down to 4 Ohms - incompatible with the above. I know putting odd drivers into cabs is a bit hit or miss, but this is sounding pretty good a low-ish volumes. The question is - the would I be better completely removing the (circular) horn and allowing a port for the Beyma. I'm pretty sure it isn't intended for sealed cabs? I'm pretty crap at trying to use WinISD - I haven't a clue, so maybe someone here might give me some good advice? Ta!!!! G. Quote Link to comment Share on other sites More sharing options...
Stewart Posted August 17, 2009 Share Posted August 17, 2009 The horn (with a crossover) won't halve the impedance like running two woofers in parallel. You're probably 'safest' running the cab sealed (rather than using a port of no-prticular-dimension), but whether or not you get usable low-end... Someone familiar with ISD will no doubt be right along Quote Link to comment Share on other sites More sharing options...
alexclaber Posted August 17, 2009 Share Posted August 17, 2009 That's a very low Qts driver so it definitely needs a ported enclosure. At a guess a 3" hole should work ok. If that's too boomy, add some tubing to make a longer port. Alex Quote Link to comment Share on other sites More sharing options...
geoffbyrne Posted August 17, 2009 Author Share Posted August 17, 2009 Thanks Alex (again!). Geoff Quote Link to comment Share on other sites More sharing options...
MoonBassAlpha Posted August 17, 2009 Share Posted August 17, 2009 [quote name='geoffbyrne' post='571738' date='Aug 17 2009, 04:10 PM']Thanks Alex (again!). Geoff[/quote] Is there a thread anywhere explaining the meaning of the abbreviations quoted in speaker spec. sheets? This would make a useful pinned topic if there isn't one already... Quote Link to comment Share on other sites More sharing options...
alexclaber Posted August 17, 2009 Share Posted August 17, 2009 [quote name='MoonBassAlpha' post='571741' date='Aug 17 2009, 04:12 PM']Is there a thread anywhere explaining the meaning of the abbreviations quoted in speaker spec. sheets? This would make a useful pinned topic if there isn't one already...[/quote] Funnily enough Eminence have this on their site! [url="http://www.eminence.com/resources/data.asp"]http://www.eminence.com/resources/data.asp[/url] Alex Quote Link to comment Share on other sites More sharing options...
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