1), MP3 Player 2), USB card 3), Short Ciruit / DC / Over heat / Power Delay Protection

JLD-QSK Series Professional 2 Ways speaker

Tyep: Active

Amplifier Function Description:

   1), MP3 Player: MP3 Player controller and control digital display

   2), MP3. in: Accepts signal from SD/MMC/MS Card and USB jack, supports MP3 and Wma format

   3), Level: Adjusts signal of the MP3 Channel

   4), Level: Adjusts signal of the Mic.in Channel

   5), Mic.in: Accepts signal from microphone

   6), Level: Adjusts singal level of the line in channel

   7), Line in: Accepts line level signal from external music source, such as Mixer

   8), Volume: Controls the output level for the unit

   9), Treble: Raise or lower amount of high frequency by +/-12dB

   10), Bass: Raise of lower amount of lower frequency by +/-12dB

   11), Power Led: Lights up when power is on

   12), Clip led: Lights up when system signal level approaches clipping.

   13), Line out: Sends a mixed signal of the unit at line level.

   14), AC Voltage: Selectro (115V or 230V)

   15), AC Socket (with fuse link): Connects power card

   16), Power switch: Turns power on/off

Other Extra Optional function:  a), Remote Control; b), Radio / FM;  c): SPK OUT (run other passive speaker)

Speakers Description:

   QSK12US:  12inch    300W   8Ohm Impedance

   QSK15US:  15inch    450W   8Ohm Impedance