M-500 PJB’s Flagship Bass Amp

The “Velvet Hammer”

The M-500 has evolved from the original design in 2002. Over the years we have made numerous improvements to boost performance.

We redesigned a more efficient power output stage and lowered the operating temperature of the output devices with our custom tooling of the power amplifier heat-sink assembly. Higher efficiency and lower operating temperature yields great benefit to the longevity of the M-500. It will run for decades. 

The M-500 is a single one channel power house with ultimate tone shaped by the 12-band graphic EQ and 3 band parametric EQ. It can power multiple speaker cabinets with ease. Our exclusive optical limiter circuit gives it a very smooth operation. Bass Player magazine in 2004 review quoted it “the best on board limiter found in a bass amp”.

2% silver solder connections; 2.5 mm steel chassis; heavy duty chrome plated corners; recessed Allen bolt mounted handle; custom machined metal and anodized aluminum knobs; and much more. No details left unattended; and they scream quality.

(1) Active Input Jack (2) Passive Input Jack (3) Limiter ON/OFF Switch (4) Input Level Control (5) Graphic EQ On/Off Switch (6) 30 ~ 200Hz Parametric Frequency (7) Level Control 30~200Hz (8) 300Hz~2KHz Parametric Frequency (9) Level Control 300Hz~2KHz (10) 3KHz~15KHzParametric Frequency (11) Level Control 3KHz~15KHz (12) Parametric EQ On/Off Switch (13) Master Vol. Control (14) Headphone Jack (15) Power On/Off LED (16) Power On/Off Switch (17) Line Input Jack (18) Limiter Level Control (19) 12 Band Graphic EQ (20) External Vol. Control Socket (21) Effect Return Jack  (22) Effect Send Jack
(1) EQ Pre / Post Switch (2) GRND Lift Switch (3) DI Out (4) Line Input (5) Pre Amp. Out Jack (6) Efect Send Jack (7) Efect Return Jack (8) Speaker Out 9) AC Power Socket (10) Power On / Off Switch
Model M-500
Power Output (RMS) 720 W/2Ω, 480 W/4Ω, 280 W/8Ω
EQ 12-BAND Graphic EQ
Input 2 x Input (Passive, Active), Line-In, Volume Pedal, Headphone
Output 2 x Speaker Out(8Ω/Speakon), 2 x Preamp Out, D.I. Out(GND Lift SW, Pre-Post)
Other COMPRESSOR & LIMITER with On/Off Switch、FX Send/Return
Power 120 or 240V AC
Dimensions 16×12.5×5.5 inch / 407×318×140 mm (W x D x H)
Weight 41 Lbs / 18.5 Kg
Review