Forum Thread

PA Speakers - parallel port hookup to my receiver

tocheeba 303 134 August 12, 2013 at 06:05 AM
Not sure where this would even go...but instead of posting on some audiophile forum and getting blasted for not knowing the first thing about this stuff, I figured I'd ask here. I got 2 free speakers from a high school in the district that I work for, as they're redoing their gym this year and were throwing away these speakers. However, the back of them have Parallel ports - which I've never really seen before.

What do I need to do in order to get these to play off some receiver? My wife has an old sony receiver in storage somewhere - with the normal speaker wire outputs on the back. However, I don't know what sort of adapters I need to buy for these speakers to run off it. I'm not looking for anything crazy (I'm sure the receiver won't power these things to their potential) - I just want to use them for garage/bbq/party speakers at the house.

If someone could give me a real basic idea of what I need to do to hook these up to a normal stereo/tv receiver, that would be great. I've googled stuff but just read all sorts of audiophile garbage that makes no sense to me Smilie

(maybe some amazon or monoprice links?)

Thanks!!


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#2
I think parallel refers to how they're hooked up, not the connection type... I *think* it basically means you're daisy-chaining them. But search for 'PA parallel connections' or something similar and you should find tons of data

edit - in reading again, I think you already know this and are asking if you can convert a standard 1/4" stereo jack to something a receiver can handle... sorry.
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Last edited by vivahate August 12, 2013 at 06:19 AM
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#3
You can buy a long 1/4 inch "daisy chain" cable like this [amazon.com], then cut it in two and hook the bare wires to the Sony's speaker output.
One half cable per channel and one input per speaker, either one will do.
Do NOT stick both channels into one speaker.
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#4
Quote from RockySosua View Post :
You can buy a long 1/4 inch "daisy chain" cable like this [amazon.com], then cut it in two and hook the bare wires to the Sony's speaker output.
One half cable per channel and one input per speaker, either one will do.
Do NOT stick both channels into one speaker.
Thanks! So just this one cable, cut in half, and wire it up to the sony's black/red normal speaker output? Sounds simple. These are mono inputs on the speaker, right? Will the sound not be as good just inputting one into it? I'm assuming something bad would happen if I stuck 2 different channels into one speaker Smilie
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#5
Quote from tocheeba View Post :
Thanks! So just this one cable, cut in half, and wire it up to the sony's black/red normal speaker output? Sounds simple. These are mono inputs on the speaker, right? Will the sound not be as good just inputting one into it? I'm assuming something bad would happen if I stuck 2 different channels into one speaker Smilie
The concept is that these speakers are for PA systems or musical amps that output one channel through those mono 1/4 inch plugs.
If you had 2 pairs of those speakers, one cable would run from the amp into either of the inputs, then you'd plug a second cable into the other port and run it to the seconds speaker, effectively running them in parallel, thus the term parallel ports.
If you ran the amp's left channel into one port and the right channel into the other, it would create a short circuit that would likely blow the amp.
As you only have one pair, you'd plug one half wire into each speaker (either port is fine) and at the other end with the bare wires, connect them to the Sony amp's speaker outputs, observing identical phasing by way of using the same colour wire for ground and channel on both sides.
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#6
Thanks so much!! Smilie
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#7
Your going to need quite a bit of power to run these. A simple home receiver may not be enough to run them. A simple search turned up the manual. Worth a look http://www.manualslib.com/manual/...tml#manual
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Quote from LiquidRetro View Post :
Your going to need quite a bit of power to run these. A simple home receiver may not be enough to run them. A simple search turned up the manual. Worth a look http://www.manualslib.com/manual/...tml#manual
Most PA or musical instrument speakers are more efficient than home hifi speakers, so the OP will not have any difficulty attaining high volumes.
What he/she will not get, is high quality sound.
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#9
Thanks - I'll test it out. I don't mind searching craigslist for something more powerful if it's not enough - but I'm looking for anything mind blowing....simply for a garage setup or for bbq's in the back yard, etc.
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Quote from tocheeba View Post :
Thanks - I'll test it out. I don't mind searching craigslist for something more powerful if it's not enough - but I'm looking for anything mind blowing....simply for a garage setup or for bbq's in the back yard, etc.
Nobody wants to drag his $1,000 hifi speakers outdoors for a party.
PA speakers are perfect for the job.
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Quote from RockySosua View Post :
Most PA or musical instrument speakers are more efficient than home hifi speakers, so the OP will not have any difficulty attaining high volumes.
What he/she will not get, is high quality sound.
My thinking was that they need a minimum number of watts per channel to run. Since most of your modern home theater amps have lots of power(500W), but they are split out over 5 to 7 difference channels so any one can only deliver around 100W per channel. These speakers may require say 60 watts to work at all since they are so large. It's worth experimenting with for srue. If not I would bet the OP could sell the PA speakers for a decent amount.
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Quote from LiquidRetro View Post :
My thinking was that they need a minimum number of watts per channel to run. Since most of your modern home theater amps have lots of power(500W), but they are split out over 5 to 7 difference channels so any one can only deliver around 100W per channel. These speakers may require say 60 watts to work at all since they are so large. It's worth experimenting with for srue. If not I would bet the OP could sell the PA speakers for a decent amount.
Those wattage ratings are only suggestions as to the type of power range one might want to have to drive the speakers to their maximum performance.
What decides the volume per watt is known as "Efficiency" and it is rated in DB's.
In short, high efficiency speakers will play louder per watt that the less efficient ones.
In the case of musical instrument and/or PA speakers, most of them are more efficient that the hifi speakers that you would buy for a real home system, in other words, US or Canada made, and none of the Asian brands.
One of the caveats about the type of amps use to drive PA speakers, is that they will be over rated in their quoted power output, as they don't observe the same measurement standards, where A hifi machine will put out X amout of power at less than 0.0X% distortion, throughout the entire bandwidth from 20 to 20k cps.
When they rate PA amps, they'll measure them (just an example) as the amount of watts at 1% distortion at 1Khz (cps), so the net result is that if you have a 100 watt per channel Bryston amp, it would kick a 500 watt PA amp's butt.
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