geoffbyrne Posted August 17, 2009 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
Stewart Posted August 17, 2009 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
alexclaber Posted August 17, 2009 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
MoonBassAlpha Posted August 17, 2009 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
alexclaber Posted August 17, 2009 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
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