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Old 12-09-2011, 11:51 AM   #1
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Default Need help from the home audio nut jobs

Getting 2 or 3 of these (come in a pair)

Amazon Amazon

Looking for a stereo receiver to run them. Will be installed at the gym at the warehouse. Have cable box audio to stereo receiver. Was thinking of running each speaker in mono but running single speaker wire from speaker to receiver then soldering that single wire into a Y split for left and right.

First quest is will that work

Second is if I have six 100 watt speakers will a 100 watt receiver work or do i need a 600+ watt receiver? Not sure how the math works on figuring it out.
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Old 12-09-2011, 12:40 PM   #2
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Running 2 8 ohm speakers in parrallel will create a 4 ohm load.Running less than 8 ohms can cause your amplifier to overheat or even trip the short circuit breaker.
I have been successful in my past but I did not run the stereo all day long.
Running them in series will create a 16 ohm load...safe but will require more power.


here is a simple diagram. http://www.colomar.com/Shavano/speaker.html
To get Mono, you would have to bridge your amp. I do not suggest that


If the speakers are 100watts..that's probably maximum watts.
No need to drive them to full power. 25 watts per speaker will be
fine.

I prefer stereo receivers for music, but few make them. You could get a surround sound receiver and run it in 4 channel stereo.
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Old 12-09-2011, 12:54 PM   #3
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Quote:
Originally Posted by jeff_man View Post
Was thinking of running each speaker in mono but running single speaker wire from speaker to receiver then soldering that single wire into a Y split for left and right.

First quest is will that work
Well, you will get sound out of the speakers. Depending on if you wire them in parallel or series, you are either halving or doubling the impedance to 4 or 16 ohms, and most home theater receivers are expecting an 8-ohm load on each output. This mismatch will affect amplifier efficiency. At this point the engineers will chime in and point out how I have grossly oversimplified and butchered electronics theory, but the general point is that your proposed scheme is sub-optimal.

I guess I don't understand why you'd spend a bunch of money on speakers and a new receiver and then get cheap/lazy with the wiring.

Quote:
Second is if I have six 100 watt speakers will a 100 watt receiver work or do i need a 600+ watt receiver? Not sure how the math works on figuring it out.
Multi-channel receivers will have a rated watts per channel, so look for one rated 100 wpc or less. If you see one listed as "450 watts" it will probably mean 90 watts x 5 channels. You don't "need" anywhere near that much output for running music in a gym though. Those speakers claim 90 dB @ 1 watt, which is not inefficient. I'd guess most home theater receivers on the market will have enough power to drive 4 or 5 of those to deafening levels.
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Old 12-09-2011, 01:04 PM   #4
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Guessing i would be better off with something like this
Amazon Amazon
Running the unit in mono and only doing 4 speakers.
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Old 12-09-2011, 02:22 PM   #5
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most multi channel amps will do "multi channel stereo" which is fine.
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Old 12-09-2011, 04:53 PM   #6
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Questions.
Do the speakers have to go in the walls?
Can they go in the ceiling? If yes, what is the ceiling constructed of?
Is this an industrial-type gym environment or a posh wimpy spa?
What is your maximum budget?
What is the size of the room/rooms?
Do you want to hook up a microphone (ie, for paging)?
Do you want any amount of bass? How much?
What type of music will be played?
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Old 12-09-2011, 05:46 PM   #7
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Quote:
Originally Posted by samnavy View Post
Questions.
Do the speakers have to go in the walls?
Can they go in the ceiling? If yes, what is the ceiling constructed of?
Is this an industrial-type gym environment or a posh wimpy spa?
What is your maximum budget?
What is the size of the room/rooms?
Do you want to hook up a microphone (ie, for paging)?
Do you want any amount of bass? How much?
What type of music will be played?
Look at first link
yes but we are going in wall under each tv; drop ceiling
just a big dry wall office in the warehouse for employees
~$500 i think
100x30
no
nothing extra
Incoming tv audio and headphone in jack
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Old 12-10-2011, 01:46 PM   #8
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First off, if I interpreted the OP correctly, you want to combine the left and right outputs of the receiver together?

Don't do that. Mono the source going into the amp (you can parallel the left and right inputs together with no problem.)

As for speaker wiring, it is possible to do series-parallel configurations in order to achieve the correct impedance. For instance, two 8 ohm loads in parallel is 4 ohms, but two sets of 4 ohm pairs in series is 8 ohms (magic.)

Ideally, you'd be using a "70 volt" system for this, however. Such configurations use speakers which have an on-board transformer and present a high load impedance, so you can wire as many as you want in parallel. They usually also have multiple taps (wired to a switch) so you can easily adjust the relative loudness of one speaker relative to another. Such configurations require an amp with a 70 volt output, however these are cheap and readily available.

Examples:

http://www.parts-express.com/pe/show...number=300-218

http://www.parts-express.com/pe/show...number=248-430

http://www.parts-express.com/pe/show...umber=310-2120

http://www.parts-express.com/wizards...omo=&srchAttr=
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Old 12-10-2011, 04:02 PM   #9
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Joe I almost typed up the "Y-the-inputs" response but he was posting integrated amps... which you'd have to disassemble to combine inputs on.
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Old 12-11-2011, 12:53 AM   #10
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Quote:
Originally Posted by y8s View Post
Joe I almost typed up the "Y-the-inputs" response but he was posting integrated amps... which you'd have to disassemble to combine inputs on.
Huh? I interpreted the first post as "I want to take the audio output of a cable box and hook it up the the input of an amp."

Did I miss something?


Quote:
Originally Posted by jeff_man View Post
Second is if I have six 100 watt speakers will a 100 watt receiver work or do i need a 600+ watt receiver? Not sure how the math works on figuring it out.
As a general FYI (though I still advocate going with a 70v system) there's no real hard-and-fast rule here.

The wattage rating on a speaker indicates how much continuous power it can handle before you burn out a coil. The wattage rating on an amplifier indicates how much power it can deliver before reaching a certain distortion level (peak) or overheating and going into thermal shutdown (RMS.)

The downside is that these numbers are nearly meaningless for "average" content (eg: music). The upside is that it doesn't really matter.

You can plug an amp rated at 500w into a speaker rated at 50w, and it's highly unlikely that you'll damage the speaker unless you're playing a continuous sine-wave (or anything similar, such as a Jay-Z album) into it.

Actually, you'd be more likely to damage a 500w speaker on a 50w amp, as you're probably going to be driving the amp into clipping, and thus sending all sorts of nasty square-waves into the speaker.


Cliffs: don't get hung up on comparing wattage ratings.
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Old 12-11-2011, 02:22 AM   #11
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My only input is to NOT get a Sony. Sony may have been the big dog in its day, but goddamn they are putting out some junk in recent years. My receiver has been nothing but problems since day one. A clunky menu system and **** for brains when it comes to guessing what I want it to do for me (I wish it just wouldn't try). It barely ever auto detects the audio format, and it loves to change channels for me for no reason (DVD to TV, or HDMI1 to HDMI2). Denon, Yamaha, or nothing for me.
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Old 12-11-2011, 03:39 AM   #12
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I'd go with a cheap mixer and 2 beringher a500 amps. Run mono from the source or the mixer, bridged on the amps.
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Old 12-11-2011, 12:52 PM   #13
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Quote:
Originally Posted by Joe Perez View Post
Huh? I interpreted the first post as "I want to take the audio output of a cable box and hook it up the the input of an amp."

Did I miss something?
No, I did.
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