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View Full Version : Desings for one 18" RD blowthru



Savag3
04-14-2009, 04:30 PM
Looking for advise on a blowthru design for a 18" RD ALpha , I dont want to stand the sub up, looking for a design that allows horizontal placement . Thanx in advance. mx dm 48w X 17t X ?? D

JL Audio
04-14-2009, 04:35 PM
you're wanting to have an 18" sub... horizontal in a 17" tall space? does this not sound incorrect? do you mean at an angle?

brian84corvette
04-14-2009, 04:35 PM
what exact year and model is your truck ?

Savag3
04-14-2009, 04:46 PM
you're wanting to have an 18" sub... horizontal in a 17" tall space? does this not sound incorrect? do you mean at an angle?

i think you mean verticle would be incorrect the max dimension is 17H the sub would be laying[ie horizontal] (if possible, or tilted) im thinking tilted is the only way correct ?

its a 91' chevy truck fleetside standard cab

JL Audio
04-14-2009, 04:47 PM
i think you mean verticle would be incorrect the max dimension is 17H the sub would be laying[ie horizontal] (if possible, or tilted) im thinking tilted is the only way correct ?

its a 91' chevy truck fleetside standard cab

i'm high today. ugh :crap: :rolleyes:

brian84corvette
04-14-2009, 04:51 PM
yes, I believe if you made it at a 45 deg. angle it would probly work out best,
but you would realley have to secure it good with extra bracing so it wont come loose.

if 17" tall is your max demention, id go no larger than 16" tall
because you are going to want to insulate the actual box off of your bed
of the truck or else it will vibrate and create all kinds of racket.
that and if you get a bed top it might also take a tiny bit of space too. ?

Savag3
04-14-2009, 04:56 PM
yes, I believe if you made it at a 45 deg. angle it would probly work out best,
but you would realley have to secure it good with extra bracing so it wont come loose.

if 17" tall is your max demention, id go no larger than 16" tall
because you are going to want to insulate the actual box off of your bed
of the truck or else it will vibrate and create all kinds of racket.
that and if you get a bed top it might also take a tiny bit of space too. ?

ok . . yea the 17 is actually taking those issues into consideration, thanx

galacticmonkey
04-14-2009, 04:58 PM
Just go with 2 15s instead.

sound_around
04-14-2009, 04:59 PM
yea at an angle facing front and slightly up.

Savag3
04-14-2009, 05:55 PM
Just go with 2 15s instead.

yea its kina lean'n that way now . .

dbeez
04-14-2009, 06:26 PM
when it comes to rd audio mike465 is the man you need to talk to as he knows there products inside and out....

KHARPS
04-14-2009, 06:30 PM
What about a 4th order? You could have the sub firing either up or down into a ported chamber and just the port would fire into the cab.

Savag3
04-14-2009, 07:39 PM
isnt that basicaly a sealed box with a tunnel into the cab ? what is it when there is a port and then ported into the cab ? 6th ?

KHARPS
04-14-2009, 09:04 PM
isnt that basicaly a sealed box with a tunnel into the cab ? what is it when there is a port and then ported into the cab ? 6th ?

4th order is sealed chamber firing into a ported chamber and the ported chamber is the only part of the box coming into the cab. I'm not sure if the sealed box tunneling into the cab is considered a 4th order, because that is exactly what I wanted to do but there has to be more to it than that I would think (size of tunnel has to have some effect on sound).

profundus-sanus
04-14-2009, 09:40 PM
Just go with 2 15s instead.

werd

much easier to fit.

won't be easy to properly load a 18 in a 17" tall box.. especcially if the woofer has a vented pole.

4th order bandpass blowthroughs are the way to go imo.

Savag3
04-14-2009, 11:14 PM
4th order is sealed chamber firing into a ported chamber and the ported chamber is the only part of the box coming into the cab. I'm not sure if the sealed box tunneling into the cab is considered a 4th order, because that is exactly what I wanted to do but there has to be more to it than that I would think (size of tunnel has to have some effect on sound).

yea pretty much what i was thinking sealed and then chamber ported in to cab, i want to look into 6th order with 2 RD alpha 12's sometime.