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PA Systems A forum for discussion of all parts of a sound reinforcement or DJ system: loudspeakers, mixers (desks) etc.

Diy small active PA speakers with off shelf components
Diy small active PA speakers with off shelf components
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Old 10th July 2018, 09:54 AM   #1
sage12 is offline sage12
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Default Diy small active PA speakers with off shelf components

lets say we take beyma sm115/n/8 midbas,tweeter rcf nd 1411m on eighteensound xt 1086 horn, and put it inside custom reflex cabinet tuned to 35hz and made by local woodworker.

now for amplifier cant decide, some sort of quick all in one solution would be good.

why not buy lets say JBL EON 615 replacement amplifier module and mount it , not sure what xover freq. but it has some sort of dsp so it should be adjustable?

this is for small size PA system and intent is to not need bass bins and to have reasonable output for to max 100 people on open places and what is point of my asking to be cheap, easy and fast to assemble, reasonable db and high quality output.

how feesible this solution of parts looks? any suggestions welcome thank you
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Old 10th July 2018, 10:53 AM   #2
picowallspeaker is offline picowallspeaker  Italy
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Hi, check out the plans available at 18 Sound and B&C which include the passive crossover schematics. An amplifier which is outside the enclosure is much better, it doesn't have to be that compact & portable.
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Old 10th July 2018, 11:02 AM   #3
Borus is offline Borus  United States
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well from my quick look you'll have to get the amp the wood and cover material for the box and the time to build it for under $156.00 and you will not have a warranty. I'm all for DYI but I would go for less expensive parts because I would want to build two and I need try-pods to get them up so they will project better.
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Old 10th July 2018, 01:34 PM   #4
Enzo is offline Enzo  United States
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I think DIY is great, but if you want fast, cheap, and easy, I don't see how you can beat a commercial powered speaker. A new one comes with a warranty as Borus mentions, but even more savings if you buy on the used market. Every major speaker maker has powered speakers with a 15" and a horn. And the modern molded cabinets will weigh a lot less than a big wooden box, no matter how nice the wood might be.
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Old 10th July 2018, 02:06 PM   #5
conanski is offline conanski  Canada
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Quote:
Originally Posted by sage12 View Post
why not buy lets say JBL EON 615 replacement amplifier module and mount it , not sure what xover freq. but it has some sort of dsp so it should be adjustable?
No these boxes don't have any user adjustable DSP.

Quote:
Originally Posted by sage12 View Post
this is for small size PA system and intent is to not need bass bins
You're about to make the same mistake every single DJ has made and you won't know how bad it sounds until you hear the alternative. To get clean sound with all in one speakers you have to go 3 way, you can't get big bass and clear mids/vocals from the same driver at the same time, it's one or the other. But this add complexity, size and weight and it's still a compromise, there is a better way.

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Originally Posted by sage12 View Post
how feesible this solution of parts looks?
Not great. If you want portable then go really small with an 8+1 and add a single 15" sub, a single amp module direct from china can power the whole works. This sub/sat package will deliver outstanding sound and be remarkable easy to move and transport.
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Old 13th July 2018, 07:15 AM   #6
chris661 is offline chris661  United Kingdom
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Quote:
Originally Posted by conanski View Post
You're about to make the same mistake every single DJ has made and you won't know how bad it sounds until you hear the alternative. To get clean sound with all in one speakers you have to go 3 way, you can't get big bass and clear mids/vocals from the same driver at the same time, it's one or the other. But this add complexity, size and weight and it's still a compromise, there is a better way.
It can be done with a 2-way cabinet, but you need a good compression driver that can run nice and low. Going for a crossover in the 800Hz area helps a lot, and then you can use 15" subwoofer drivers and get a good amount of bass extension.

Chris
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