External Subwoofers

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Passive (unpowered) Loudspeakers

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

Using loudspeakers other than the B1 Bass Module with any of the L1® systems is not supported. However you can safely try your own external subs if the impedance is no lower then 4 ohms (typically a single 4 ohm loudspeaker or two 8 ohm loudspeakers in parallel). The output from the Power Stand is 250 watts RMS into 4 ohms.

L1® Classic and L1® Model I

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

For the sake of those attaching third party passive speakers (an unsupported application).

Output if no B1 Bass Modules detected

  • 40-180 Hz Bandpass (that is: NO B1 EQ)

If one or two B1 Bass Modules detected (or resistors used across NL4 2+ / 2- pins to emulate detection)

For more details about the Power Stand outputs see: PS1 Power Stand / Bass Line Out

L1® Model II

L1 Model II This information is applicable to the L1®  Model II

For the sake of those attaching third party passive speakers (an unsupported application).

Output if no B1 Bass Modules detected

  • 40-200 Hz Bandpass (that is: NO B1 EQ)

If one or two B1 Bass Modules detected (or resistors used across NL4 2+ / 2- pins to emulate detection)

For more details about the Power Stand outputs see: L1® Model II Power Stand / Bass Line Out


Active (powered) Loudspeakers

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

Using powered loudspeakers with any of the L1® systems is not supported.

PackLite® power amplifier Model A1

The PackLite® power amplifier Model A1 is part the L1® System. It can be used to power up to two B1 Bass Modules. This is connected to the Power Stand Bass Line Out.

Third Party (non-Bose®) Systems

If you want to use a powered loudspeaker system, you can use the Power Stand Bass Line Out as the signal source. Here are notes specific to the L1® you are using.


You will probably use an powered loudspeaker in the same way as you would connect an PackLite® amp.

Please see PackLite® power amplifier Model A1 for extensive notes that include ideas that can be applied to other systems.

Ongoing discussion

I need more bass article - discussion