JBL SU333 Sub-Woofer circuit diagram - Dolby Pro-Logic Surround Processor Amplifier Subwoofer

Used ICs: 4052,4094, TC4052, CS4227, M62446FP, TL074, STK407-250, STK407-050, STK4038, ZR38601(Dolby Digital Decoder)

Sub-woofer Amp 60w x 1 ch. section
Type (Class AB, D, other) AB — —
Load Impedance (speaker) 4 Ohms Nominal
Rated Output Power 60 Watts ALL CH.driven
THD @ Rated Power 0.08 % 22k filter 60W (BW 30-120Hz)

2-Way video-shielded micro-satellites with titanium laminate tweeters and common voicing for all five channels, and an 8-inch, long-throw, floor-firing sub-woofer.
Complete, self-powered Dolby  Digital home-cinema sound system with five satellite speakers, sub-woofer, remote control, and all amplification built in.  All amplification and controls are mounted in the sub-woofer, eliminating the need for a separate control unit.
Remote controllable via outboard remote eye that can be mounted with the center channel or separately, so that the sub-woofer can be hidden away.

ABOUT DOLBY DIGITAL

Dolby Digital, unlike “matrixed” systems (such as Dolby Pro Logic) that derive and decode multi-channel sound from two channels of sound, is capable of delivering information for one sub-woofer and five full-range channels as discrete and individual channels in digital AC-3 data format from sources such as a DVD player. The result is clear and accurate digital sound to each speaker, along with availability of stereo-surround effects (Dolby Pro Logic features mono surrounds).

Dolby Digital is capable of delivering several different formats of surround sound, the most robust one being the 5.1-channel mode, which provides separate signals for five satellite speakers as well as for a sub woofer. The ESC333 features a “5.1-Ch” indicator that illuminates when a Dolby Digital 5.1-channel encoded signal is present. Dolby Digital can also provide other AC-3 digital multi-channel signals, as well as 2-channel signals, which can be decoded via Dolby Pro Logic processing into multi-channel surround sound. In the latter case, both the Dolby Pro Logic and Dolby Digital indicators will illuminate in the ESC333 display.

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Circuit diagram (Schematic)

Automatic On/Off and Automatic Digital-Input Selection
The ESC333 offers two unique user-convenience features:
Automatic Turn-On/Shut-Down and Automatic Digital-Input Selection.
The Automatic Turn-On feature will turn the ESC333 on as soon as a source connected to its digital inputs (such as DVD, CD player with digital output, or any other device featuring a coaxial or optical digital output) is switched on, or as soon as the unit connected to its last-used analog input starts outputting sound.
When using digital inputs, the Automatic Turn-On can be activated by turning on either one of the connected digital sources such as a DVD player or a CD player with digital output. When using analog inputs (TV or AUX), Automatic Turn-On is available only for the device that was last listened to before the ESC333 shut down. In order to listen to the other device, the ESC333 input needs to be manually selected by using the Input button on the product and on the remote, which, in turn, disables the Automatic Digital-Input Selector until the ESC333 is shut down.
The Automatic Turn-Off shuts the unit down five minutes after all sources connected to its digital inputs are powered down and the device connected to its selected analog input stops playing.
The Automatic Digital-Input Selector automatically selects the source connected to its digital inputs when that source is powered on. Upon power down of this digital unit, if no other source is on, the ESC333 will switch itself off after five minutes.

If the analog source that was selected prior to the digital source turning on is still playing, the ESC333 will switch back to that other source. Once a digital source is powered on and selected as an input, turning on a device connected to the other digital input will not switch the input until the selected digital device is first powered off. These two features can only be used if the customer does not manually turn the ESC333 on or off, and does not manually select an input source. Once either of these selections is made manually, the automatic features are disabled as follows:
1. If the ESC333 is turned off manually, it will not turn back on automatically until five minutes after the source connected to the ESC333 is shut down. During these five minutes, it can be turned on either from the front panel or via the remote control.
2. Once an input source is selected manually, the Automatic Source-Selection feature will remain disabled until the ESC333 shuts down.
3. Once any one of the two devices connected to the ESC333 digital inputs is powered on and its input is selected by the ESC333, the device connected to the other digital input of the ESC333 cannot be automatically selected until the already-selected digital device is powered down