What type of output connectors does your Keyboard have? (I'm assuming L/R Mono 1/4" Line Out Connectors?)
What kind of input connectors does your speaker have? (Could be either RCA Phono Type or 1/4" Mono Line Connector?)
BTW, I am just wondering who told you it was OK to buy an unpowered speaker to drive a professional quality keyboard?
I hope you can get your money back on it and buy something more suitable.
If you bought it online with no advice I can understand it but if you bought it from a local music store that salesman should be shot.
Keep us posted on how things work out for ya.
Really I took another look at that Phonic S 715. That speaker has a 15" woofer and 400 Watt continuous power handling capability. Any amp that drives that anywhere close to its rated output will be loud enough to play a dance in a high school gymnasium.
In a home setting, typical listening levels anywhere above 20 watts are usually enough to have your neighbours calling the cops with a noise complaint.
Typical listening levels for a stereo in a living room are between 5 and 10 watts at a comfortable level.
If you have a pair of 40 watt amps or powered monitor speakers in your home studio that is more than enough overhead to handle the transient peaks and rock the whole house at any party.
If you have a couple of those S715's powered by a 200 Watt PA you will literally be able to vibrate the glass in your windows.
In all good conscience, my advice to you is to send the S715 back and order a decent pair of studio monitors in the 30 to 100 watt range. It will save you money and it will provide the best bang for the buck.
Here's some likely candidates for what you need.
http://www.musiciansfriend.com/studio-monitors?_requestid=42741
Get a pair of those instead of that 15" monster and you will not be disappointed. Speaker technology has come a long way in the past 30 years and bigger no longer means better.
In fact, you could even use your own home stereo as a set of monitors if you have a half decent set with aux inputs. just get a cable like this one and you are good to go. Give it a try before you blow $400 on a PA system that's better suited to a hockey arena than your living room
http://www.musiciansfriend.com/accessories/live-wire-1-4--rca-dual-patch-cable/330490000000154
Seriously, try the cable first and see how much noise your ears can take before they start to bleed And turn all your volume controls down to minimum and edge them up gradually the first time you try them so you don't blow out any speakers or gear.
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