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Old 26th June 2004, 08:55 PM   #1
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Question Speakers for a club

Hello, Im new to these forums and needed some answers. I'm looking to open a small club in a place that used to be a cinema (1 400 seat theatre) I'll get the exact size later today. I sent a 150 Watt amp (in 4 ohms) X 6 channels to get made but I was thinking of having it upgraded to 300W in 2Ohms. Would 150 * 6 be enough for a closed PA system?
I know this is the speaker thread and my main question is, where can I find easy to follow instructions to make an exponential horn style speaker design for 15" woofers? I know boxes change with speaker specifications, but I was wondering if there was a standard design that might work, or if I needed more specifications other than watts and size to build it yes or yes.
Thank you very much.
Since I'm planning on building everything myself I still have no exact speaker design in mind, so Ideas are welcome, thank you
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Old 27th June 2004, 03:26 AM   #2
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I was just talking to someone who owns a company that works with sound systems and he was telling me that I'd need a 2k rig, so with 1.8 I'd be ok, so here I go again... any information about building a horn box for 2 15" speakers in one enclosure? They's be 150~200W each so they could handle the 300W , and then build a few of those. thank you. Of course I'd then add a driver and a tweeter to each box.
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Old 27th June 2004, 05:12 PM   #3
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Hello, do you want to build a BASS horn?if so t/s specs must be known.

http://www.melhuish.org/audio/horn.html

for main speakers i would suggest the treid and proven
COmpression driver + either matching 12"s/15"s
or
COmpression driver + midrange horn + 12"/15" for midbass + sub!

Dont fret over small power increases,remember that +3db electrical energy ,doesnt actualy give a large perceived increase in output

so 150w-300w,not much difference perceived even though 3db more electrical input.
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Old 27th June 2004, 06:14 PM   #4
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Thank you for that. I have seen those horns on this site quite a bit, but I need to build 4 which would be very time consuming. I was thinking of some boxes like the one below, for 15". What I wanted to know is if there are easy building plans for a box like this, matching the frequency and all. Also can I build one like that for 2 speakers. I don't know the exact name for these boxes in english, here they're called exponential boxes. Thank you.
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Old 27th June 2004, 07:46 PM   #5
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Also can I build one like that for 2 speakers. I don't know the exact name for these boxes in english, here they're called exponential boxes.
====
'Horn loaded bassbins' is commonly used.

815 (sealed)

http://www.lansingheritage.org/image...closures08.jpg

817 (vented)

http://www.lansingheritage.org/image...closures10.jpg

GM
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Old 27th June 2004, 09:22 PM   #6
qi is offline qi
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Check this out my brother...

<Page Down> to DRAW 1

http://www.wmeckle.com/ALTEC/Index.htm
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Old 27th June 2004, 09:25 PM   #7
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Default Just what I was looking for

Thank you very much qi!
I just got the plans in for the place and it measures 16meters X 24meters, and the acustics are that of an old cinema/theatre (which is what it used to be). Now... should I go with a 150W X 6 amp or the 300 X 6 one? Any help is apreciated!
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Old 27th June 2004, 11:56 PM   #8
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Hi, Im sorry for this stupid comment but all I have read about passive crossovers is very simple, and what I wanted to know is if when I calculate the crossover's capacitor or inductor value and I have for exaple, a tweeter and 2 15" 8Ohm speakers in paraller I need to use the value for 8 ohms or 4 ohms for the inductor. Maybe is someone has a page that explains multiple speaker wiring that would help, thank you very much
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Old 28th June 2004, 11:41 AM   #9
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Take note,that those front horns are for higher frequencies,not bass

If you have enough amplifiers i would filter actively.

If not you must passive filter.
-note,the equation relies on the exact impedence to be known,so it must be measured

there are several online websites which explain this with online calculators

www.sound.westhost.com has active filter plans + PCB

Qi:that site is pretty cool!
Click the image to open in full size.
woah an exquisite listening room!
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Old 28th June 2004, 12:22 PM   #10
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hi

since you are in argentina i guess selenium would be available there , and i think it would be the best to start with

next once you have selected your drivers according to your budget - get back here for the cabinet designs with your size considerations

in my openion pro audio drivers are designed overa long period of time - they are made to suit all applications

take for eg the classic jbl - 2226 - 15 inch its used in JBL in their Sr & MR series - its used in cinemas (though jbl has another driver for cinema sound) it used in W bins - horns all kinds of designs and arrays - the driver is designed to be very versatile and to perform in various application

pro drivers are not so - cabinet loading specific

yet if you have - not much budgetry probs i would recommend company - drivers and enclosures the entire unit - turbo sound or JBL

as since you have got 6 ampilifiers you will be facing a good amount of phasing and sound engineering problems

suranjan

transducer design engineer
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