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I just purchased a Steward Audio CVA 50-1 amplifier and four Enforcer Sound E86CW in-ceiling speakers for my son's recently enlarged (62'x32')classroom which currently has a 2-speaker (front of class)soundfield system. Unfortunately,I did not receive any wiring diagrams to show proper connections for various scenarios. The manual included in the shipment keeps referring to the another manual I don't have re- input source for additional information. I cannot find any information about the best location of the speakers for this size of a room nor whether the additional amplifier should be connected to the 25 v or 70 volt pins. As well, the speakers appear to have multiple wires to accommodate either 25 v or 70 volt hookups at various wattages, ranging from .125 t 5 watts respectively. Also, the manual provided refers to Female XLR and Male TRS, RCA and TS connectors which should be added to either the balanced or the unbalanced system without any explanation of what this means and which hookup would normally provide the best results. Any clarification re-the above would be much appreciated. Sincerely, G.W. Gedies

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  • gsigroup Sep 24, 2009

    Thank you for your quick reply.

    In response to your questions, following is a description of the controls located at the rear of the StewartAudio CVA 50-1 amplifier as viewed from left to right:

    - INPUT: 3 pins (left to right) +(pos), - (neg), downward arrow

    - RVC: 4 pins (left to right) 10v , RVC, GND, MUTE

    - two pins for power (no problem)

    - SPEAKER: 3 pins: 25V, downward arrow, 70V

    Am I correct in assuming that the speaker transformer wires, that is, the C-BLK (common black??) should be connected in parallel at 70 volts, as you had suggested, but at which of the following wattage values. i.e., 125, .31, .62, 1.25, or 2.5 watts (there is no wire opposite the 70v- 5watt label)

    Could you also please comment on the balanced vs unbalanced system hookup (which is the better?) and the respective connectors apparently required for either system.

    Thanks, G.W. Gedies


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What you purchased was a distribution amp that usually is used with 70V lines. Each speaker should have a transformer for different wattage levels as you stated. The idea of this type of distribution system is to give you an even level of sound without requiring high volume levels at certain points. Place the speakers where you will get as even a coverage as possible assuming that all speakers are at the same volume level.

Since I don't know your specific model, I can't describe the actual connections. Can you post either pictures or a description of the input and output selections that you have and I'll describe the typical hookup.


Posted on Sep 24, 2009

  • ABRsvcs Sep 24, 2009

    The balances vs. unbalanced is like using a microphone (XLR type connector) vs. RCA jacks. What are you going to use for the sound source? CD player or maybe the output from a mixer?

    All of the speakers should be hooked up on parallel to the 70V line. The nice part about it is that you connect then as follows:

    Amp ==> speaker ==> speaker ==> speaker ==> speaker

    Using the 70V system makes the connections of multiple speakers trivial. You can always add more if needed. Just keep adding them onto the end in parallel (black-black and red-red).

    The amp should have a power rating of x Watts. Set the speakers to what ever makes sense, but be consistant. I would set each one to 1/2 W to start. Connect them to the arrow and the 70V. The arrow should be ground.



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