Wisdom Audio DCAB-1 - Manual (Page 13)

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Either of two things might cause the fuse to blow:
• a large spike in the line voltage on the AC mains
• a failure of some component within the DCAB-1 itself (unlikely, but
certainly possible – particularly if spikes have managed to enter the
DCAB-1 and stressed the components inside)
If your AC fuse has blown, disconnect all wires from the unit (both signal
and power), replace the fuse with an AGC 1A fuse, and restore power to
the unit without reconnecting signal cables. This approach prevents a po-
tential problem in the DCAB-1 from affecting the rest of your system. Wait
a few moments, then disconnect power again and check the fuse.
If the replacement fuse has blown, contact your Wisdom Audio dealer for
assistance.
If the replacement fuse is intact, the first one was probably blown by an
AC mains spike. (Consider investing in good power conditioning. Your
Wisdom Audio dealer can provide a recommendation. A high quality
power conditioner will both protect your equipment and actually improve
performance by supplying clean AC power to all your components.) Re-
place the fuse, reconnect signal and power to the DCAB-1, and power
the unit up with your power amplifiers turned off. Once everything in the
system has had a chance to stabilize (usually just a few seconds), turn on
your power amplifiers.
3 Real Time Analyzer Microphone Input
The DCAB-1 includes a calibrated microphone that is matched (via
calibration) to a costly reference microphone. During calibration, this mi-
crophone should be placed where your head would normally be during
listening, using a microphone stand (not included). A mic stand with a
boom is often more convenient, though a plain stand is usually adequate.
Connect the DCAB-1 microphone to this input using a high quality, bal-
anced microphone cable. If the cable supplied with the DCAB-1 is not
long enough, you can “daisy chain” another quality balanced mic cable in
series with the one provided without adverse effects on measurement ac-
curacy.
4 RS232 Interface
The RS232 interface is used to connect a computer for calibration and
setup. It provides two-way communication between the DCAB-1 and the
computer that is used for adjusting all the myriad parameters of the cross-
over/equalizer. Thanks to this communication, you can adjust the many
settings of the DCAB-1 in real time, seeing and hearing the results of your
labors immediately.
5 Balanced Audio Input
This balanced audio input accepts a signal from a preamplifier with bal-
anced outputs via a high quality XLR connector.
The pin assignments of this XLR-type female input connector are:
1 2
3
Pin 1: Chassis ground