Super Bass Horn V.02 by Startec (Quad Acoustics-F)

This sub's speakers are usually powered with more than 1kw, depending on the speaker you use. You should use a large section cable (2x4 or 2x6 mm) for a better power passage. If you use a small section cable it could cause a higher electrical resistance and decrease watts passing from the connector to the speaker. Same with the cable connecting amp and cabinet. The RCF lf18n401 speaker has a pair of clamp connectors wich are very practical (you just push, put the twisted cable in, and lift) so you would just have to solder the cable to the speakon connector. You should drill a hole outside for the connector and another smaller one on the baffle panel for passing the cable, no better place to do it than the right or left side under the baffle hole, do not drill in the middle because the speaker edge will go there and it won't leave much space. Buy cable and connectors before you drill the holes so you can make them the correct size, no air should pass through them. You could put 2 connectors per cab and wire them in parallel to run 2 cabs with the same amp channel. If you are not practical with that you'd better check this and other forums on speakon wiring threads, generally there are a lot of guide lines. I'm quite sure you'd find some tutorials online as well.
You'd better paint the speaker with a protective impregnating agent, and then use a hard and resistant finish paint. Just remember if you use water based treatment, you should finish with water based paint, solvent based and water based product don't work well together. Personally i use bicomponent poliurethanic paint, but there are a lot of monocomponent professional paints on the market.. look for warnex or tuffcab. I painted the outside and part of the inside horn (where i can reach..) Its clearly better to paint the inside of the speaker too, specially if you'll use the cabs outside with high humidity and bad weather, but you won't manage to do it when they are built and glued.. you could paint them inside before you put on the lid (which is the 1200x950cm side) but be careful not to paint on joints, or leave drops on them: hardened paint drops could keep panels slighly separated and ineffective joints are the worst thing one can get on this kind of cabs.
Good luck by the way, this ain't no easy build for a beginner.
Cheers!

Edited by sushi - 26 October 2021 at 11:15am

hi guys, thanks a lot for taking the time to reply on my questions!

Edited by skankinmoe - 28 November 2021 at 11:57am

Sorry, Toss Out.. there's no 21" sbh plan around.
To be honest, if you plan to use 21 inches woofers, you can choose some better cab for them: sbh it's a long horn designed to reach low sub frequencies with a 18" driver, and still with
some compromises (uneven response, for ex.) Those frequencies are more easily reachable with bigger drivers without the need to load them in such long horns. There are some smarter plans made for 21'drivers, no difficult to find as well. Start looking for the 21' paraflex sub,to begin..

I think i will switch with 18"...sbh looks awesome to my eyes haha anyway thank you all guys!!

Someone has original Startec SBH plan 18" to link me? full plan view..thanks