PS1 Power Stand / Bass Line Out

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Classic This information is applicable to the L1® Classic
L1 Model I This information is applicable to the L1 Model I

This Page Reviewed By Bose

Model I right side Input/Output panel

Bass Line Out and B1 behavior

The behavior of the bass line out and B1 Bass Module outputs on the L1 Classic and L1 Model I are based on the philosophy that adding B1 Bass Modules should give the user more dynamic range (can play louder) but should not alter the tone of the instrument, including tone adjustments made using the R1 Remote, the T1 ToneMatch Audio Engine or other tone-shaping equipment.

This philosophy is notably different from other manufacturers, who take the approach that it's okay (or desirable) that adding more bass speakers causes the instrument tone to become "bassier".

With this philosophy in mind, here is how the bass line out and B1 outputs work.

No cable plugged into the Bass Line out

  • If there is 1 x B1 connected to the B1 Bass Module output on the PS1: B1 EQ, bass signal gain = REFERENCE LEVEL
  • If there are 2 x B1 connected to the B1 Bass Module output: B1 EQ, bass signal gain = REFERENCE LEVEL - 6 dB

Why? Because when you add a second B1, if you did not change the signal strength you would get 6 dB more bass relative to the mids and highs. This would alter the tone of the instrument. To keep the tone the same, while still allowing the more dynamic range (system can play louder by 6 dB) the signal level must be reduced by 6 dB.

Cable connected to the Bass Line Out

  • If there is 0 x B1 connected to B1 Bass Module output on the PS1: flat EQ on Bass Line Out, bass signal gain = REFERENCE LEVEL - 6 dB
  • If there is 1 x B1 connected to B1 Bass Module output on the PS1: B1 EQ on Bass Line Out and B1 Out, bass signal gain = REFERENCE LEVEL - 6 dB
  • If there are 2 x B1 connected to B1 Bass Module output on the PS1: B1 EQ on Bass Line Out and B1 Out, bass signal gain = REFERENCE LEVEL - 12 dB

With More Than 4 B1s

The PS1 does not measure the exact number of PackLite® power amplifier model A1s, so there is a slight error if you use anything but 1,2, or 4 B1s.

For 6 B1s you will be 3.5 dB bass heavy, for 8 B1s it'll be 6 dB heavy.