Speakers for a club

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jackmcdowell

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Joined 2004
#1
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
 
#2
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.
 
#3
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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#4
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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#7
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!
 
#8
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
 
#9
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!😎
An externally hosted image should be here but it was not working when we last tested it.

woah an exquisite listening room!
 
#10
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
 
#11
mikee12345:

Yes -- a very cool website
Did you notice the 15HZ Sensurround horn sub (like Magnetar's) in the middle behind the chess set?
Have you ever seen plans for that Sensurround unit?

jackmcdowell:

Don't forget the Sensurround unit (15HZ - 50HZ).
There will be long lines waiting to hear that D-E-E-P B-A-S-S :bigeyes:
 
#12
Hi, sadly budget is a problem, and I need to build speakers for 4 of the chanels. I was seriously considering the Altec 815 unvented or 817 vented; which would be better? Also this amp puts out 300W in 2 ohms, which is how the woofers would be wired, but the driver would just be 8ohms probably... Should I just match the amps value at 8ohms with the driver's? If not maybe atenuating the signal...

They do have selenium here but they are very expensive since our currency devaluated. There are also good brands here, which aren't that expensive, mainly a brand called Leea, anyways I'm just rambling on, thank you.

Oh by the way I got the plans for both boxes, when I decide do I just build them as they are or do they need to be a slightly different size according to the speakers_?

Jack
 
#14
Jack, what type of application are you gonna be using these cabs for? Background music, live sound, etc? As has been mentioned active crossovers might be a good option as 300W of power won't go terribly far if you need high output to get over the roar of the club. Have you considered buying some good used cabs? There are plenty SR and MR out there, speaking for the US of course. The series are mostly discontinued but sound pretty great out of the box and many are bi-ampable. But you can certainly build very respectable boxes using something like eminence drivers that aren't too shabby. Open many respected companies boxes and you will see the tell-tale eminence label on the drivers.
 
#15
Hi, I hadn't even noticed the Sensurround horn sub either! fits in pretty well with the rest of the furniture. I'm going to use them for dancing music, here its mostly commercial dance music, so I need a decent punch. As for the boxes its imposible to get 4 horn style cabs that are the same here used... most people just use standard boxes. Anyways I talked with the carpenter and he said it could be done easily in 3/4" mdf. Im still deciding on the vented or unvented though... the person who'se designing my amp said maybe an unvented and maybe porting it if I needed. As for the impedance, here we have 4 ohm speakers so I can parallel 2 for a 2ohm load.
What this person did recomend was placing a 15"woofer and a 15" extended range speaker, and then only mount some piezos somewhere. Any ideas on this? Thank you very much.

BTW, For now Im having the 300W @ 2 X 4chanels built, to use with 4 of these boxes so 1200W @ 2 Real RMS. I might add another one on later.
 
#16
Dance Music- In that case once you've selected your componenets really look at your power requirements and make sure your amp will be powerful enough. For dance music with a 15" enclosure in fuul range I'm really afraid 300W won't be enough for a punchy sound. It would work, but you probably wouldn't have a lot of headroom to get, say 100dB out of the system. Also if your amp is rated at 300W it's not a goo idea to ask everything it can give all the time as heat kills amps. The system you talked about would work, but I'd avoid using a 15" for exteded response. A 15", 2 8" or 10" and a 1" compression driver would work very well for dance. The 15" for low punch, the 8's or 10's for mid-bass, and 1" for everything above say, 1.2k. Piezos are just bad for anything below 10k, they get harsh and metalic sounding real quick. Good companies that do use them, like Community, cross them at about 8k so all they handle is "sparkle" which they can do well. But a compression driver will sound much better than a few piezos.
 
#17
Yes what I was thinking about was 2 15" @ 4ohms in parallel, 150W each for those boxes so I could get 300W @ 2ohms and that way take advantage of the amp... My idea was a 1" and piezos to go along (skipping the 6" or 10")... Its just that this guy recomended this so I wanted some extra feedback to compare opinions. I really do think your way is the way to go imix500, Thanks for your input, Jack
 
#19
For live sound, definetly vented. You could throw 2 4 inch ports (or whatever the box design suggests) between the 15's and really get good punch from them. JBL, and pretty much every other manuf. does it all the time in thier bass bins. But keep in mind that the improved response of a vented box needs a bit more power than a sealed box because the acoustic load on the drivers is a bit different. The cabinet will also need to be a little bit larger. But I'd definetly go vented.
 
#20
Yeah the box designs are very different, the vented one has a much larger chamber inside, the unvented one has a much larger horn... so its almost a completly different box. I just saw someone here who's selling 2 used 816's and 2 A7s , wnough for 4 of the speakers so I'd only need to build 2 dual boxes so I guess I can handle the more advanced vented design for just 2, thank you very much, Jack
 
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