- What's Included
Normally, most amplifiers can easily drive between four and 16 ohms of speakers. With each speaker added to an amplifier, the impedance level drops by half. If you hook two 8-ohm speakers up to an amplifier in parallel, the amplifier actually sees an equivalent resistance of 4-ohms. Hooking three pairs to one amplifier, the equivalent impedance is 2.6 ohms, which is too low for most amplifiers to operate properly. For the engineers in the crowd, the most commonly used formula in the speaker industry is 1/R(total) = 1/R1 + 1/R2 + 1/R3 + etc. (R is the resistance of a speaker).
When this Impedance Matching Volume control is used between a set of speakers and an amplifier, the volume control can present a higher impedance level for the amplifier to see. Once all the higher impedance volume controls are added up, you're back to a safe level for your amplifier.
Use this volume control in parallel with up to 16 pairs of speakers. You can set the unit to provide an impedance load of 16, 32, 64 ohms, etc. At 16 ohms you can wire 2 pairs of speakers in parallel and still have an 8-ohm load for your amplifier. At 64 ohms you can wire 8 pairs of speakers and provide a 4-ohm load and so on. A jumper on the volume control allows easy setting of the volume control's impedance level.
The volume control has a frequency response of 20 - 20,000Hz response and supports up to 100 Watts RMS per channel. The volume control has 12 volume steps and the last position is a mechanical off so no sound will come from your speakers when the volume control is turned off. It accepts up to 14-gauge wire and includes a trim plate.
Manufacturer: Xantech Manufacturer Product No.: XVCD100 UPC: 04277731428 Power Handling: 100 Watts continuous Impedance Matching: Adjustable for up to 8 speaker pairs (1, 2, 4, 8 pairs) Attenuation: 11 steps plus Off; max 42 dB Frequency Response: 20Hz-20kHz +/-1 dB Speaker Terminals: 14 gauge, Quick Connect (detachable) Mounting: Minimum 20 cu. in. J-box or Mud Ring Speaker Compatibility: 4-, 6-, or 8-ohm speaker systems IR Carrier Frequency: 38 KHz Certifications: UL Listed, RoHS
- Review of 81311 Review by ADAM
Review of 81311
Connectors are a pain
Posted on 4/6/2011
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- Volume controller
- White, ivory, almond and black decorator-style inserts and volume knobs
- Owner's manual