greg molina wrote on Sat, 13 November 2010 19:57 |
Hello Hal, I'm doing this as a donation to our local non profit organization that holds bingo and seminars on weekends. I am by no means an expert on this field. I'm installing and buying the pa system, so pls. forgive me if i've wasted your time in answering my question. Also, i'm not that rich that i can just buy these at retail prices. Again, thank you for the advice, in the present time, i'm also researching this through other audio forums, so as soon as i get the correct answer, i'll let you guys know. I'm a Honda mechanic by trade, maybe i can lend you some good advice if you have a Honda.
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Hello Greg,
The problem with getting helpful information to you, is that we are not familiar with those speakers, the wiring color code of the Transformer/ crossover, and exactly what's in their circuit design.
Having checked the model of the gear Package (because these speakers only come in a package deal with the tuner/amp) ....and then on to the specs and Operators manual, tells us nothing.
There are no color codes listed, and no crossover circuit schematic.
If you've connected the black and white speaker wires and you're getting nothing, it could mean:
a.) the crossover has some parts that need replacing
b.) there's something you're doing wrong
c.) the cable you're using from the amp is bad/wired wrong
d.) the amp channel is bad (did you swap for a known good channel?)
Using a crest amp may be a bad idea, even for checking them, because, these speakers handle only 20 watts. I'm not sure what this "ebay seller" is referring to in regards to two jumpers.
I don't believe, for the low cost of this system, they would "design in" an impedance conversion circuit besides the transformer it already has.
In my opinion, with these cheaper model of speakers, there is only one way to easily and certainly change these boxes from a 70v transformer input to a low impedance input....and that is to completely bypass the transformer. (TAKE IT ELECTRICALLY OUT OF THE CIRCUIT).
Again...on one side of the transformer (input side) should have 4 wires.....the other side of the transformer should only have two wires and those should be attached to the crossover. THOSE TWO wires are the ones you need to connect your 4 0r 8 ohm output from your receiver or amplifier.
You will never make these speaker cabinets into 8 ohm speaker cabinets....they ARE 4 OHM!
Lastly, WHY are you wanting/needing to change these speaker boxes to 8 ohms..? (although they're 4 ohm) Did you get the Receiver that originally came with the "package"? If you did, why are you not using the receiver in the 70v mode?
Hammer