PA system for classroom


2013-03-07 7:55 pm

I am a novice when it comes to the audio world. I have a wireless microphone by Sony (transmitter is model UTX-B2 and receiver is URX-P2 )and I would like to use the wireless microphone to create a basic PA system for classroom lectures. I've tried to do research online but was not able to definitively answer my own question.

For a basic setup, would connecting the wireless receiver to an amplifier and then the amplifier to a speaker work? Or do I need to get a mixer and amplifier (or powered mixer). I don't need anything fancy, just presentations.

Thank you.


2013-03-07 7:55 pm
Thanks simon7000. I have looked into powered speakers before, but they are too cumbersome for my wife to carry from place to place. I forgot to mention above that I also have a small portable Bose Wireless Speaker and I like the quality of that speaker. I guess to besides the wireless microphone and speaker that I already have, what other basic components would I need. A powered mixer is once again kind of large for my wife to carry around. If an amplifier is the only other thing I need to boost the audio transmission, then I was thinking of getting a Dayton Audio DTA-1 from Amazon: Dayton Audio DTA-1 Class T Digital AC/DC Amplifier 15 WPC: Electronics
Have you gone to a music store and shopped? Or contacted a place like for example Sweetwater customer service and asked for recommendations?

SOme thoughts for you:
wireless or wired, to your system, a microphone is a microphone.

Since you are doing lectures, I am assuming it is straight vocal, not a bunch of music. Sometimes referred to as "spoken word". If so, then you don't need a system ready to make snorting mighty bass notes and tons of loud. You just need it to sound reasonably natural. (As opposed to a bullhorn)

A powered mixer is just a mixer and a power amp in the same enclosure, otherwise it is the same thing as a mixer and a power amp. It is all a matter of convenience for you. Powered mixers come in all shapes and styles from very small to pretty large. There is a wide range to chose from. SOunds to me like you do not need many features.

Power amps come in all sizes, as do mixers. A small two or four channel basic mixer can be had cheap and will do your needs. A small basic power amp is probably enough also. Of course as opposed to powered mixers, separate components like that will mean hauling separate things and set up will require them to be connected together. You could put them all in a small portable rack, but then you have essentially created your own powered mixer.

The powered speaker idea is worth a second look. A full size powered speaker - like with a 15" woofer - might be unwieldy for the wife, but they also come in smaller versions like with a 10 inch woofer. Even the JBL Eon has a 10" model. One small powered speaker, plug your mic into it, and talk to the crowd.

There are small lightweight portable sound systems too. They look ugly, but the Fender Passport sounds OK, and has a small model or two. The Passport 150 isn't huge, and they have a Passport Mini you might check out.

Peavey makes their Escort system. And other brands also make small portabloe systems, typically a molded plastic speaker housing or two that snap onto the mixer so it all tansports as one thing.
All advice is meaningless unless you define more clearly what ur trying to do, how many people, what size room, how loud you want to be, and what ur putting into the mic, where the mic is going to be placed or held, and all things like that, including that transportation issue you mentioned, plus how often ur doing this...

then reasonable advice can be given, maybe.

15 watts of class D power is insufficient in most instances.
no, you do not "need" a mixer.
yes, the output of the wireless mic can go to an amp, IF it has a volume control somewhere in the signal path...

oh, and btw, you can't put the speaker on the floor and have the audience in the back of the room hear what ur saying... it needs to be up in the air above the heads of everyone pretty much... so stands are used for this... or maybe a tall stool in a pinch... top of a table, with a chair on it?


A powered speaker is going to be a bit heavier than its passive cousin, but not that much; and that Bose wireless system you mentioned is already powered. I suspect that all these people pressing twelve inch drivers onto you are probably overkill. Only voice, and if I've understood correctly, female voice; if the system gets acceptably loud down to 100Hz, we're happy. And it won't be very loud, or feedback will become the limiting factor (of course, if your wife is having to bellow because the kids won't stop making noise, or she teaches workshop round metal lathes and drill presses, that's a different situation (and a different style of microphone; a lapel omni like that's only going to give you three or four dB of gain).

But I've got a couple of little powered speakers – Montabo, actually, but it's hardly critical — with six inch bass drivers, srew onto mic stands (or just put them on any high shelf; height is your friend) and you can carry the pair, in a carrier bag, with one hand.

The advantage of a powered mixer is that you have the controls right next to you, so if ti starts feeding back you're not suddenly faced with the problem of getting to the volume control. Don't expect rock and roll levels; but you're not going to get them with a lapel mic, anyway.


2003-09-03 12:17 pm
chrispenycate just made the case I was too lazy to write down for the speakers I mentionned above (they're all active 6" with a few inputs and the ability to be screwed on mic stands).

Out of curiosity, which montarbo are using ? I couldn't find anything similar on their website (browsing quickly through, I must admit).
chrispenycate just made the case I was too lazy to write down for the speakers I mentionned above (they're all active 6" with a few inputs and the ability to be screwed on mic stands).

Out of curiosity, which montarbo are using ? I couldn't find anything similar on their website (browsing quickly through, I must admit).

They probably don't make them any more; it must be fifteen years that they (four of them) have been travelling around in a sports sack when I've been doing outside gigs, and they've been modded seven ways to sunday (In the finest traditions of this site), XLR inputs (the Neutrik dual connectors, balanced, ground lift.

Instrument returns, talkback for choir recordings, tiny wedges, micro speech PA; anything where portability overrides absolute quality.

And I'm feeling too lazy to go down to the cellar and check out the model number ;).
While passive systems can be lighter in weight than a standard sized powered rig, there are alternative options available, such as the relatively new HK Audio LUCAS nano system, which I recently saw at my local GC. It sounded amazing for its small size, and would fit nicely in a class room environment because of the small size