DBX BX-3

Commentary

A 4-channel power amplifier with BTL connection.

The BX-3 is configured as an independent four power stage configuration.
This configuration allows you to select the output mode using the switch, so you can play two channels with a bridge (BTL) connection, or a three channel system that combines a two channel system with a BTL connected subwoofer.

The power supply section uses a large toroidal transformer with extremely thick bifilar winding with excellent regulation.

Four 150W high-power transistors are placed in each power stage in a parallel push-pull configuration so that 40A of current can be instantaneously sent to the speakers while keeping the output impedance low.
The first stage has a dual-FET direct input and all stages have a direct DC amplifier.

Model Rating

Type	Power amplifier
Actual Output (RMS, 20 Hz to 20 kHz)	When four channels are driven 150Wx4 (4 Ω, THD 0.02% or less) 105Wx4 (6 Ω, THD 0.003% or Less) 90Wx4 (8 Ω, THD 0.003% or Less) When 3 channels are driven 150Wx2 (4 Ω, THD 0.02% or less) 400W (4 Ω, THD 0.02% or less) 105Wx2 (6 Ω, THD 0.003% or less) 300W (6 Ω, THD 0.01% or less) 90Wx2 (8 Ω, THD 0.003% or less) 220W (8 Ω, THD 0.01% or less) When 2 channels are driven 400Wx2 (4 Ω, THD 0.02% or less) 300Wx2 (6 Ω, THD 0.01% or less) 220Wx2 (8 Ω, THD 0.01% or less)
Dynamic Power (IHF A-202)	Independent mode time 400W/ch (2 Ω) 300W/ch (4 Ω) 200W/ch (6 Ω) 160W/ch (8 Ω) Bridge connection time 850W/ch (2 Ω) 800W/ch (4 Ω) 650W/ch (6 Ω) 550W/ch (8 Ω)
Load impedance	2 Ω ~ 16 Ω
Total harmonic distortion factor	0.003% or Less (at 4-channel rated output)
Cross modulation distortion factor	0.003% or Less (at 4-channel rated output)
Input sensitivity	1.2 v (in independent mode) 0.9 v (Bridge Connected)
Input impedance	20k Ω
Damping factor	50 or more
S/N ratio (IHF-A)	115dB
Channel separation	90 dB or more
Pwer	100 VAC, 50Hz/60Hz
Power consumption	600W
External dimensions	Width 475x Height 143x Depth 450 mm
Weight	21.5kg