Velodyne CHT8, Velodyne CHT10 – Audio - Video Subwoofer System amplifier schematic

Semiconductors used: TIP31C, TIP32C, UpcC1237HA, BA4558

  True sub-woofers operate at extremely low frequencies which are primarily omni-directional. While it is recommended that the sub-woofers be placed on the same plane as the satellite speakers, room and system conditions often dictate otherwise. Keep in mind that frequency response and output level can be drastically influenced by placement, depending on the acoustic properties of the listening room. Typically, the optimum location for a sub-woofer is tucked away in a corner of your listening room.

  This location will usually offer the greatest output levels and optimum low frequency extension. The worst location for a sub-woofer it typically far away from any walls, and close to the center of your room. Avoid these locations when possible. When using a pair of Velodyne sub-woofers in stereo, it is preferable to place each sub-woofer by the satellite of the same channel. Typically, a minimum distance of 1 to 2 feet from your TV to the sub-woofer will be adequate to avoid any magnetic interference.

Built-in 130 watt (RMS) power amplifier (CHT-8)

Built-in 150 watt (RMS) power amplifier (CHT-10)

Built-in 170 watt (RMS) power amplifier (CHT-12)

Sub-woofer Direct - switchable crossover bypass

Adjustable (40 to 120Hz) low-pass crossover

Selectable (80 or 100Hz) high-pass crossover (CHT-12)

85 Hz high-pass crossover (CHT-80/CHT-10)

Line-level inputs and outputs

Speaker-level inputs and outputs

Signal sensing auto turn on/off with bypass option

Variable volume control

Selectable phase control (0 or 180 degrees)

Dual staggered low-pass crossover; 12dB/octave initial, 24dB/octave ultimate

Anti-clipping circuit

Over excursion protection.

  During normal conditions, the sub-woofer may be left on continuously without any problems. The unit is equipped with a signal sensing circuit that will automatically turn on the unit when a signal is present at the inputs and turn off the unit after several minutes when there is no longer any signal at the inputs.

Circuit diagram

Specifications

Click on the schematic