dindiki

Sub driver class A

•  active lowpass subfilter
•  balanced mono output
•  decoupled channel summation
•  zero stereo impairment
•  Filter Class A with JFet cascade
•  separate signal (0) and shield mass (S)
•  Level and frequency via switches
•  zero potentiometer, hum, noise
•  sub driver: 100 x 58 mm, high 12 mm
•  sub driver   58,-

sub driver

•  sub driver - supply: 100 x 100 mm, high 40mm
•  sub driver - supply class A   98,-

sub driver

•  sub driver - supply - trafo: 100 x 175mm, high 40mm
•  sub driver - supply class A - trafo   138,-

supply pre amp

Musical foundation

The sub driver generates the analog deep bass signal for the subsequent amplification from the stereo input. Correction and pre-filtering are done without gimmicks. The limit frequency, which is designed for a reasonable range, and the level for adaptation to the satellites are set. We do not use inequalities, scattering or inhibiting layers of coal from Pots.

sub driver

Two phase-shifted signals are available at the output. An existing stereo amplifier can be used symmetrically - each stereo channel receives one signal, the speaker is then connected to both "plus poles" L + R. Prerequisite: The stereo power amplifier has no capacitors in the signal at the output. Any mono amplifiers are operated at one of the two outputs if they do not have a balanced XLR input.

supply pre amp

The experimental setup shows the sub driver in a balanced arrangement with two SAC amplifiers. Since the transformer for the output stages (not in the picture) also supplies a reduced auxiliary voltage, the sub driver with Class A power supply was chosen here but without its own transformer. The class A voltages are looped to the side in the sub driver in order to be able to connect further pre-stage components.

SAC amplifiers for the drive of the satellites remove low-frequency loads by changing only one capacitor without additional active crossover.

SAC amplifier