SYMPTOM: Noise (popping) in audio:
1. Popping while playing, especially one string. (check bass set-up to be sure there is adequate clearances between the string
and pickup pole pieces.)
2. Popping while just sitting there, or when touched. (under dry environmental conditions, it’s possible that electrostatic discharge
is the cause. (try antistatic mat on floor, humidifier in room)
3. Popping when tapping or banging on chassis. This amp model contains a tubes/valves in the preamp, it’s possible that you
are experiencing the beginning of a tube/valve failure (replace tube/valve one at a time with a known good tube/valve to see
if this resolves the problem). Note that at very high gains and channel volume positions, no tube/valve will be perfectly quiet
in this regard.
SYMPTOM: Protect LED turns on:
1. Disconnect all cables except power cable, if the amp is no longer in protect, try plugging in just the speaker cable. If the amp
goes immediately into protect, there is likely a fault with the speaker cable. Then, plug the speaker cable into the speakers. If
the amp goes immediately into protect, one possible cause is a defective driver, but another possible cause is a defective or
damaged crossover (and/or high frequency driver) that is presenting an illegal load to the simplifier and the protection circuit
is working correctly. (try a known good speaker cabinet from another manufacturer to rule this possibility out. If the amp works
correctly with another speaker cabinet, call customer service for assistance. This is more common with “do it yourself” speaker
projects with incorrectly designed/built crossovers. ALL amps with PWM carriers are sensitive to stored reactive energy is
defective crossover tank circuits.)
2. Protect circuit shuts down amp while playing at low to moderate volumes (possible shorted speaker cable, try known good
speaker cable)
3. Protect circuit shuts down amp at moderate to high volumes (Verify that total load to the amplifier has not fallen below 2 ohms,
and that the impedance switch is set to match the impedance of the speakers connected to the amp. (possible causes are
incorrect pairing of multiple speaker cabinets, incorrectly labeled speaker cabinets that were repaired or modified without
relabeling, defective driver that has shorted voice coil turns as voice coil warms up.)
4. Power source voltage falling dangerously low due to improper wiring or extension cable that is too long for its wire size/gauge.
(correct problems as needed with the help of a qualified electrician)
SYMPTOM: No (or slow) USB charging of connected device:
1. Is this an Apple device? There are several program controlled charge rates available for Apple products, varying from 100mA
all the way up to 2.1A. The charge port will support the 500mA standard, which will charge the larger devices more slowly
than the higher powered dedicated chargers.
2. Is this an Apple i-Pad or other large tablet? When operating an iPad or tablet, the current draw of the screen alone will be
close to 500mA so the charging rate will be very low. Operating with a charged battery and also connected to the charge port
on the amp will greatly extend the battery life under use however.
3. Is this an Android phone that Qualcom QC enabled? This charger does not support QC, and will charge at the slower 500mA
rate if the device software allows it.
4. Does your device use a USB-C connector? While it won’t charge at the higher rate’s supported by this standard, it should be
backwards compatible with the 500mA standard.
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