yea, lowes is weird about the arauco. One store by me carries it, the other never heard of it...
Hey for any good horn folders out there. I've got one I'm working on right now. I'd like to make a single MCM FLH. I've played with hornresp, and have what I think satisfies my current need.
It's going in a corner (the .5pi) and I'd prefer taller. (aka, not cube) I've also found that the closer to to square aspect you keep the path, the better it works, especially when things get small like this. (so this will be starting off at 2"x2")
In case anyone is wondering, the goal is to buy one of these
http://www.consumer.philips.com/c/home-theater-systems/hts3371d_f7/prd/us/
for a church youth building, and replace the speakers with something with some oomph.
It has a high pass at 40hz, and crosses at 150, so I worked till I got something that was no louder at 150, than 40. yea I know I could have done a lot different in this design, but I think this will work in it's given purpose.
so... suggested folding?
Hey for any good horn folders out there. I've got one I'm working on right now. I'd like to make a single MCM FLH. I've played with hornresp, and have what I think satisfies my current need.
It's going in a corner (the .5pi) and I'd prefer taller. (aka, not cube) I've also found that the closer to to square aspect you keep the path, the better it works, especially when things get small like this. (so this will be starting off at 2"x2")
In case anyone is wondering, the goal is to buy one of these
http://www.consumer.philips.com/c/home-theater-systems/hts3371d_f7/prd/us/
for a church youth building, and replace the speakers with something with some oomph.
It has a high pass at 40hz, and crosses at 150, so I worked till I got something that was no louder at 150, than 40. yea I know I could have done a lot different in this design, but I think this will work in it's given purpose.
so... suggested folding?
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nope, 24 bucks is the going rate for arauco.. just picked up several sheets, and that's what I was charged as well.
For anyone thinking a dual mcm is a little much.. I agree, I was looking for something a little more pack friendly, so I made what I call, a bass-stick. 12x16x48. 4 of them set up in a V shape with a top plate, should give mighty respectable output. (131db 40-200@20v per driver) It's also brain dead simple to build. Knocked this one together in an afternoon.
Here's pics of the first trial, it's breaking in at the moment, but initial tests line right up with hornresp.
THANKS DAVID for HORNRESP... I'll cap-attack that one. David needs a big shout out for his efforts. It makes people like me, look like they know what they are doing.
For anyone thinking a dual mcm is a little much.. I agree, I was looking for something a little more pack friendly, so I made what I call, a bass-stick. 12x16x48. 4 of them set up in a V shape with a top plate, should give mighty respectable output. (131db 40-200@20v per driver) It's also brain dead simple to build. Knocked this one together in an afternoon.
Here's pics of the first trial, it's breaking in at the moment, but initial tests line right up with hornresp.
THANKS DAVID for HORNRESP... I'll cap-attack that one. David needs a big shout out for his efforts. It makes people like me, look like they know what they are doing.
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no sweat... that little 8 takes a lickin' and keeps on poundin'
I was leery of the compression ratio as well, but that was the only way I could get flat response. I asked and asked... but finally decided to go against the 3:1 conventional wisdom. Hey for $25, I figured it was worth a shot, and if I shredded a cone.. no worries. As it turns out, with a 40hz high pass... man it sounds great, without it, it sounds a bit muddy down low. My thought is that the high compression ratio chokes lower freq more than upper, which is why I don't like hearing 30hz out of this. (my earlier dual driver cabinets that keep the first part of the horn segment to be almost square doesn't have this issue) I have not pushed a cabinet to failure, so I don't know if it'll thermal or physical fail first. My guess, especially with a very small rear chamber, is it'll melt before it tears.
I think the compression chamber helps keep the cone alive as well. All of my current efforts with the 55-2421 are all FLH with compression chamber. (as much as I like TH... this driver is just a FLH native...)
I am hesitant to turn my single driver cabinets over to others, because I like to keep them under 20v per. In that case, the dual driver cabinets (8ohm total, drivers in series) are much safer in others hands. I'm currently working hornresp on making the bass-stick 17" interior dim, so I can dual driver it, just for this reason.
At some point I'll stop playing with FLH designs and this driver... but right now... it's just too tempting...
I was leery of the compression ratio as well, but that was the only way I could get flat response. I asked and asked... but finally decided to go against the 3:1 conventional wisdom. Hey for $25, I figured it was worth a shot, and if I shredded a cone.. no worries. As it turns out, with a 40hz high pass... man it sounds great, without it, it sounds a bit muddy down low. My thought is that the high compression ratio chokes lower freq more than upper, which is why I don't like hearing 30hz out of this. (my earlier dual driver cabinets that keep the first part of the horn segment to be almost square doesn't have this issue) I have not pushed a cabinet to failure, so I don't know if it'll thermal or physical fail first. My guess, especially with a very small rear chamber, is it'll melt before it tears.
I think the compression chamber helps keep the cone alive as well. All of my current efforts with the 55-2421 are all FLH with compression chamber. (as much as I like TH... this driver is just a FLH native...)
I am hesitant to turn my single driver cabinets over to others, because I like to keep them under 20v per. In that case, the dual driver cabinets (8ohm total, drivers in series) are much safer in others hands. I'm currently working hornresp on making the bass-stick 17" interior dim, so I can dual driver it, just for this reason.
At some point I'll stop playing with FLH designs and this driver... but right now... it's just too tempting...
Segment 4 is the V-couple part, right? It must be cause I'm scratching my head. What's the degrees spread to get that volume? I'd think section 3 would be a bit shorter than 120 unless the change is happening not where the top turn is. This is really neet.
I wish I had a special CAD app that took hornresp export files as input and would fold cabinets for me.
I talked with bgavin about that once, but he got "ownershippy" with me about intellectual property. That's no way to start a team project, ya know?
I wish I had a special CAD app that took hornresp export files as input and would fold cabinets for me.
I talked with bgavin about that once, but he got "ownershippy" with me about intellectual property. That's no way to start a team project, ya know?You got it. I left segment 3 at 120, because the v-couple starts at the bottom of the cabinet. Couple is 90 degree. I intentionally designed it for a 90 degree, that's why it's only 12" front to back, 16 wide, and 48 tall. I left segment 4 in, just because that's how I will use it outdoors.
As far as price on mcm, you have to look for discount codes. If you are not on the mailing list, you can google for them usually. The one that just ended on the 31st, had 55-1740's on sale for $15.99... and 55-2421's extremely cheap too. I grabbed another 8 of each, just because.
As far as "Ownershippy" - I guess that is why I am here sharing what I have figured out and learning from the collective brain trust. I have certainly learned far more than I have shared, but I am working on balancing that out.
I picked up 4 more of the MCM 8's (yeah, I have a problem) at $25 each last weekend, shipped free. You just have to play the discount code game with MCM. They provide a code on each of their flyers. Enter the code in the order sheet, and the price drops. The codes are listed on their website. Rather than look at all the catalogs, I just key in all the codes to get the best pricing. The codes used to stack, but not on my last order.
I also picked up eight more 55-1740's for $15 each, shipped. I guess I am trying to keep up with the Jim's....4 cases of those now - sound familiar?
Looks like you guys bought 'em out.
The 1740...
Yeah - I saw they were discontinued and jumped on them.
Jim bought em out last time - it isn't always me....
Even at retail, the 1740 is a lot of woofer for the $, it is an amazing woofer for $16.
It was a nice day, so during my lunch hour I knocked another one together (minus the driver cover so far) and took pics this time. (wood was already cut)
I'm assuming you wanted measurements, not pictures... sorry, have to wait till the glue dries before I do any serious testing.
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I posted this in a different thread, but since the design is inspired/bassed off of JBell's i figured i would post it here also. It uses the Dayton DVC 310-88, I have one lying around, so i plan to build it after Thanksgiving. It needs a 38hz HPF, but will produce 133.5db with a pair (1200w total and if i used Hornresp correctly).
Jbell, how have the 55-2421s responded to PA use? Were you going to post the final plans for those boxes?
Jbell, how have the 55-2421s responded to PA use? Were you going to post the final plans for those boxes?
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