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Old 16th March 2011, 09:40 PM   #11
jazd is offline jazd  Australia
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Originally Posted by Saturnus View Post
A boombox is mostly for outdoors use right?

If so remember to add the 6 dB/oct drop below 200Hz, so that -3 dB @ 35Hz is actually -18 dB (or -15 dB actually since it'll probably stand on the ground).

Even with 4 10" drivers my Boominator (over in the class-D forum) doesn't pressume to go below about 90Hz flat (F0).
Yeah it is mainly for outdoor, will get used a bit indoors too.

I didnt know about the 6 db/oct drop thing. Does that mean the frequency response curve would be better off peaking below the 200Hz mark so it would then get flattened out?

What are peoples thoughts on the GRS 8FR-8?
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Old 21st March 2011, 09:25 AM   #12
jazd is offline jazd  Australia
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I've since read up on the GRS 8FR-8 and found they arent very good (to be expected at that price).

Anyways bump.. Any suggestions?
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Old 23rd March 2011, 04:45 AM   #13
jazd is offline jazd  Australia
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Bump, need help
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Old 23rd March 2011, 07:59 AM   #14
Squeak is offline Squeak  Denmark
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The GRS is probably more than good enough for your purpose. I dont' even think you'll need a tweeter. Treble has a way of getting sucked up into open air anyway. It's probably going to be used either far away in a 360 or 180 range or quite near field, right? No tweeter needed then.
Go for four GRS, in bipole config. That will give you plenty of slam and good spread of the higher frequencies.
With 12 mm mdf you want to either double up or put braces everywhere, not only for the sound quality but more so for long term structural integrity. Mdf, esp. without laminate is not a very strong material a portable box that is going to flex and bump around.
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Old 23rd March 2011, 10:16 AM   #15
jazd is offline jazd  Australia
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Originally Posted by Squeak View Post
The GRS is probably more than good enough for your purpose. I dont' even think you'll need a tweeter. Treble has a way of getting sucked up into open air anyway. It's probably going to be used either far away in a 360 or 180 range or quite near field, right? No tweeter needed then.
Go for four GRS, in bipole config. That will give you plenty of slam and good spread of the higher frequencies.
With 12 mm mdf you want to either double up or put braces everywhere, not only for the sound quality but more so for long term structural integrity. Mdf, esp. without laminate is not a very strong material a portable box that is going to flex and bump around.
Maybe I will just go for the GRS, I'm not after sound quality really anyway. Its more about being efficient, bassy and loud.

In bipole the speakers are supposed to be in phase, is there anything special I need to do to achieve this? I guess I just wire the two speakers per side in parallel to give me 4ohms?

Thanks for the construction tips. Should I make the sides point up slightly on a angle or just make it with vertical sides?
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Old 23rd March 2011, 10:51 AM   #16
Squeak is offline Squeak  Denmark
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If you don't care about stereo (you probably don't in this case. It's probably never going to be noticed anyway) you can probably gain some efficiency by hooking the drivers up in an 8 ohm parallel-serial-parallel config.

But yes, bipole is just speakers wired in phase.

About the construction, what I'd do is wrap the whole thing in protective speaker felt (self-adhesive or spray glued), that stuff used for PA systems, put speaker corners on, also used in PA stuff, metal grilles of course and top the whole thing off with a PA handle. That will get you a rugged, prolooking box with minimal amount of work.
Monacor has quite a descent cheap selection of such stuff.
Monacor: Produkter
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Old 23rd March 2011, 11:20 AM   #17
jazd is offline jazd  Australia
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I'm pretty sure I cant bridge the channels of the TK2050 so I cant run it in that config.

Yeah I was going to add some of that stuff, grills are a must.

I just checked the postage for 4x GRS speakers and its about US$120 which sucks.. but if there isnt a better option than thats what I'll go for.
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Old 23rd March 2011, 11:49 AM   #18
Squeak is offline Squeak  Denmark
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Actually again, Monacor is a good bet then. They have some pretty good efficient drivers for low prices. Otherwise if you don't have that brand in Aus. then do a bit of searching. Visaton and Vifa springs to mind as other likely candidates. Pioneer Bofu/GRS is just hot in the US because that's what they got there. Similar drivers are available in other territories.
I'm pretty sure you can make the amp output a combined monosignal. It doesn't care what it's outputting as long as long as it's not shorting anything or presenting it to too little resistance.

Last edited by Squeak; 23rd March 2011 at 11:55 AM.
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Old 24th March 2011, 02:06 AM   #19
jazd is offline jazd  Australia
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Just bought 4x Visaton BG 20 from an Australian retailer for around the same price as the 4x GRS would have been. Thanks for the tip.
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Old 29th March 2011, 08:20 AM   #20
jazd is offline jazd  Australia
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Can someone please check over these box calculations from WinISD.

Click the image to open in full size.

Speaker parameters are here if you want to check i entered the parameters correctly.

Does that look right? 73.2L with 34.77Hz tuning and a 10cm port that is 20cm long. Last thing I want to do is build a box that is totally wrong.
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