Wireless Rear Surround Architecture Troubleshooting

I have the following set up for wireless Surround + Sub in a 5.1 setup.

Gear:

• NERO WRSKII 2x50W 5.8 GHz 2.1 Wireless Rear Surround Transmitter/Receiver Amplifier with Sub Out

  • Power Output: 50W x 2 @ 4 Ohms

    • No rating I can find at 8 Ohms

  • Freq Response: Subwoofer 20Hz-200Hz

  • Freq Response: Speakers 20Hz-20kHz

• KEF T101 Satellite Speakers

  • Amplifier Requirements: 10 - 100W

  • Impedance: 8 Ohms

  • Freq Response: 80Hz - 30kHz

  • Sensitivity: 90dB (wall mount)

  • Maximum Output: 107dB (SPL)

• Klipsch RP-1400SW Subwoofer

  • Freq Response: 16Hz - 141 Hz +/- 3dB

I have intermittent popping sounds that I am having trouble isolating (not reproducible to certain scenes / frequencies or loudness). For now I'm checking cable terminations and have adjusted the Surround crossover as high as my receiver allows (180Hz) w/ a little improvement.

My questions:

1. Assume I'm losing < 20Hz Subwoofer signals due to limited frequency response on the transmitter

2. Assume I'm losing > 20KHz Surround signals due to limited frequency response on the transmitter

3. Is the amp underpowered? The distance from the main listening position to the Surrounds is only ~1.5M.

4. What volume setting should I put the Nero on? Currently in middle position. Should I put it closer to max and then recalibrate via Audyssey in my AVR?

5. If wireless issue, how would I diagnose? I do NOT have line of sight to the receiver, but it is < 20 feet behind one wall.