Members mistermike Posted October 18, 2005 Members Share Posted October 18, 2005 I'm converting my Sonic 4-10 into a 2-12. How do you calculate the impedance when including the horn? In the old 4-10 the 8 ohm 10's were series and paralleled for an 8 ohm cab. The 8 ohm horn was run in series off the input jack. Wouldn't this make the old set up a 4 ohm cab? As it was, it was rated at 8 ohms. Any explanations? Thanks. Link to comment Share on other sites More sharing options...
Members burdizzos Posted October 18, 2005 Members Share Posted October 18, 2005 Usually, the horn is in parallel with the other speakers and crossed over with at least a capacitor. If the horn is connected in that manner, it has no effect on cab impedance. It makes no sense to hook a horn up in series. Link to comment Share on other sites More sharing options...
Members mistermike Posted October 18, 2005 Author Members Share Posted October 18, 2005 My bad, it was parallel. Thanks for the information. Link to comment Share on other sites More sharing options...
Members burdizzos Posted October 18, 2005 Members Share Posted October 18, 2005 No problem. For the cab to sound its best, you will need to put a decent crossover on the horn. Also, have you done any box calculations for the cab conversion or are you just throwing 12s in the cab and hoping for the best? I'd be happy to help you out with that part too. Link to comment Share on other sites More sharing options...
Members mistermike Posted October 19, 2005 Author Members Share Posted October 19, 2005 I'm reusing the volume, cross over and horn from the 4-10. Thanks for the offer, you've helped me indirectly already. I've run all the numbers through Win ISD and have been following a lot of the speaker posts. I'm fairly confident I've got it right. I wish it had been as simple as cutting a new baffle and throwing the speakers in. I moved the baffle 3/4 inch toward the face for more cabinet volume, added some interior support, changed the length of the port, insulated the inside, rewired and added casters. If I'm going to invest my time, I might as well make it worth my while. The drivers came last night, I have to lay out the screw holes and install the tee-nuts, reassemble and do a trial run. After reading a post you made about Delta 12lf's efficiency, I decided to go with Kappa Pro12's. Any opinions? I've been trying to do my home work and let my gear work smarter, not harder. I'll try to post a couple before, during and after pictures when it's done and give a review. Thanks for all the help. Link to comment Share on other sites More sharing options...
Members burdizzos Posted October 19, 2005 Members Share Posted October 19, 2005 Cool. I'm glad all of my rambling has been helpful. Link to comment Share on other sites More sharing options...
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