TM SVS-1B Volume Stabilizer now with Enhanced Sound Circuitry Sima Products Corporation 140 Pennsylvania Ave, Bld #5, Oakmont PA 15139 412-828-3700 800-345-7462 www.simacorp.com User Manual 2003 Sima Products Corporation Printed in USA p/n 21695 rev 03.09 TM SVS-1B Volume Stabilizer now with Enhanced Sound Circuitry Sima Products Corporation 140 Pennsylvania Ave, Bld #5, Oakmont PA 15139 412-828-3700 800-345-7462 www.simacorp.com 2003 Sima Products Corporation Printed in USA p/n 21695 rev 03.
Limited Warranty Sima Products Corp. (“Sima”) warrants that if the accompanying product proves to be defective to the original purchaser in material or workmanship within 90 days from the original retail purchase, Sima will, at Sima’s option, either repair or replace same without charge (but no cash refund will be made).
22 Typical Questions What is the difference between the SVS-1B Volume Stabilizer and compressors, companders, limiters, expanders, and automatic gain controls? The key difference is in the purpose of how each used. - Compressors are typically used for two reasons: 1) To be part of a COMPANDing system to eliminate tape hiss (in which music is COMPressed then recorded on to tape and exPANDED when played back) and 2) To make radio stations sound as loud as possible.
Specifications 4 Table of Contents Subject Page Warranty ................................................................................................... 2 Introduction .............................................................................................. 5 Product Overview ................................................................................... 6-9 Installation .......................................................................................... 10-13 Operation ..............
20 Troubleshooting Problem Possible Solutions Active light is off Be sure the Active/Bypass switch is Active (in position) Check that the power jack is plugged into the SVS-1B Check that power transformer is plugged into a working outlet and the power switch on the rear panel is on. Unit works in Bypass mode but no sound in the Active mode even though the Active light is on.
Figure 1 Front Panel 19 OUTPUT Figure 8 - Effect of the Volume Stabilization Setting on Output 6 Figure 1 Front Panel 19 OUTPUT Figure 8 - Effect of the Volume Stabilization Setting on Output
18 The SVS-1B has two volume stabilization ratios: 2:1 in the normal mode and about 10:1 in the Max mode. That is, for every increase of 10 db of the input signal, the output changes only 5 db in the normal mode and about 1 db in the Max mode. This allows you to select the amount of Volume Stabilization you desire for a given situation. In the bypass mode, the output signal is the same level as the input signal regardless of volume.
Technical Information 17 The Volume Stabilizer is a device designed to minimize unwanted volume fluctuations in music or other audio sources while maintaining the dynamics of the music. It works by monitoring the input signals and then adjusting a variable gain circuit to provide the proper output signal. It increases the signals below a threshold and decreases the signals above this threshold. The SVS-1B changes only the volume just like a volume control.
16 9 Bypass Left Output Left Input Max Norm Rectifiers and Summer Figure 7 Block diagram of the SVS-1B Max Active Variable Gain Stage Logarithmic Amplifier Amp Time Constants 6) AUDIO IN - Inputs from a standard line level audio output Active Light 7) POWER IN - Low voltage 12 V DC input. Plug the power connector from the AC adapter into this jack. Norm Variable Gain Stage Right Input Amp 5) AUDIO OUT - Outputs to go to the input of a cassette deck or receiver.
Power Connection Step 1: Connect the AC WALL TRANSFORMER JACK into the POWER IN connector on the SVS-1B. Then plug the AC WALL TRANSFORMER into a standard 120 VAC wall outlet. Audio Connections Inputs - The SVS-1B accepts standard RCA connectors with line level outputs from a VCR, satellite receiver, CD player or similar signal source. Note: Do not connect to the variable output of a device (unless it is set at full volume) as the SVS-1B will not operate properly.
14 14 Operation Power Plug the wall transformer into any standard 120 VAC outlet. Note: Be sure the volume control on your receiver or preamp is turned down when power is applied to the SVS1B, or turn all components on together. Bypass Mode With the MODE SWITCH in the “OUT” (bypass) position (ACTIVE LIGHT is off), there is no change to the audio signal. The SVS-1B will work with power on or off in this mode. Likewise, adjustment of the Volume Stabilization switch will not have any affect.
Figure 4 Connection between a source (VCR, satellite receiver or cable box) and a TV with AV jacks Connection in a Tape Loop Useful if you want the SVS-1B to minimize sound changes from your VCR or satellite receiver on your TV 12 AC Useful if you want the SVS-1B to affect the output of any device connected to your receiver. Simply select the desired input and then monitor the “tape” to hear the SVS-1B.
