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Old 29th November 2013, 07:45 PM   #1
chirs is offline chirs  United States
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Default First Multi-way Build. What to build for a big room?

After successfully building the Pensil full-range with JX-92S's, I'm ready to venture into my first crossover project.
My parameters:

1— Relatively easy electronics for a novice. I've built a few kits (mostly point to point stuff...headphone amp, guitar pedals) and I'm good with carpentry.
2— Usage: This will be our main multi-purpose set of speakers. Not hifi, by any means. It'll be hooked up to an unremarkable AV receiver for the time being. I'll eventually ditch that for something better, but I'm guessing we'll be watching movies and listening to records on that for a while, yet.
3— The room. It's huge. A converted warehouse with 13foot ceilings, brick walls and concrete floors. There's actually a good amount of acoustic dampening, but the space is large. That being said, there's some flexibility around the size of the speakers.
4— Absolute max budget is $500

Love this forum. Ya'll we're so helpful with the last project, and it absolutely rules!
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Old 30th November 2013, 01:04 AM   #2
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I take it that $500- is for the drivers and XO parts and not to include woodwork and is for stereo only ?

Good part is that in huge room you can afford the physical space to use huge boxes but you probably not get the SPL you need for a room that big with that small a budget.

There is however a huge thread on a similar project somewhere that involved cheaper drivers in a great big box.
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Old 30th November 2013, 02:37 AM   #3
sippy is online now sippy  United Kingdom
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This might be worth a look-see chris:
Beta 12LTA in a 3cf box - port size
All the drivers are a reasonably priced, very efficient respond to modding
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Old 30th November 2013, 03:18 AM   #4
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It will take a bit of reading but the speakers I was thinking of are dicussed in these 3 threads, actually worth reading through as they talk about speaker design in genearal

How should I wire my 1500 watt speakers?

What should I use to build my own crossover?

BBBIB Bigger Badder BIB Speaker

I don't know if the speakers talked about in the three threads ever got built tho
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Old 30th November 2013, 04:36 AM   #5
sippy is online now sippy  United Kingdom
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I think if any one read all 4 threads they would learn alot, the one I posted goes on to modding the drive unit as well.
There is also the Planet10 EmKen: Ladies & Gentlemen - The Emken.
JKRO & I were beta builders - it fills fairly large spaces with ease, though for bigger than say 17 x 27 ft, it could do with a sub or two (I'm slowly working up to matching enclosures for this.... hehehe)
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Old 30th November 2013, 04:52 AM   #6
ErnieM is offline ErnieM  United States
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I have a similar sized room.

I would recommend you go for a larger econowave style speaker using decent prosound drivers. A 15" paired with a 1" compression driver on the qsc horn will do just fine. You should be able to do a pair for under $500.
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Old 30th November 2013, 05:40 PM   #7
chirs is offline chirs  United States
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Thanks everyone. Will start doing my homework :-)

One thing I have been really curious about is if anyone has built something like a "built in" or console — but a bit more modern/minimal than those 60's pieces of "furniture". I'm thinking of something that sits on the floor, 5-7 feet long and maybe just knee high. Speaker built in and a bay for records or gear in the middle.
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Old 30th November 2013, 06:29 PM   #8
chirs is offline chirs  United States
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Uhhh..ok, please excuse my complete lack of speaker building knowledge here, I'm sure this is laughable to some degree.
Here's a sketch of something aesthetically I think would be interesting – I just haven't seen many builds here that have speaker so low to the ground (kind of like the some of the other BIBs but turned on their side). I'm guessing that's because it's a bad idea?
Click the image to open in full size.
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Old 30th November 2013, 11:19 PM   #9
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Quote:
Originally Posted by chirs View Post
I'm guessing that's because it's a bad idea?
Not really - especially for the bass driver as you can utilise floor loading to compensate for baffle step(have a look at the NHT 3.3 for example )

It would allow you to utilise a widebander as "mid" or "mid treble" per osher's black dalhia
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Old 1st December 2013, 08:32 PM   #10
sippy is online now sippy  United Kingdom
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Looks like a pair of 'half' Jensen Imperials at that scale.
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