Preowned L1 Model II Considerations

If you are considering purchasing a pre-owned L1 Model II or L1 Model 1S here are some things to consider.

General Inspection

Check for signs of wear and tear, scratches or dents in the Cylindrical Radiator®s, the Power Stand, and B1 Bass Module or B2 Bass Module bass modules.

Periodic Maintenance

There have been isolated incidents where Model II owners have had difficulty removing the Cylindrical Radiator® from the Power Stand.

I would encourage all users that are concerned with this happening to them to add a drop of locktite to the (2) screws identified in the attached diagram.

Thank you

Neil — Source

B2

If the system you are considering has a B2 Bass Module consider these points

B2 Bass Level Switch

If the system has a B2 Bass Module check that the B2 Bass Level switch works in all three positions. If it does, then the L1 Model II Power Stand firmware is up to date.

The B2 bass module includes a switch allowing you to select the appropriate level of bass output for your application.

There are three settings:

Switch Position	Application
+	Bass voicing designed for DJ/Music playback applications Similar to four B1s
Normal	Bass voicing ideal for bass guitar or live sound application when mic'ing a kick drum Similar to two B1s
-	Bass voicing which is perfect for acoustic guitar and vocal Similar to oneB1

Note

You must use the Bose B2 or B1 cable (or compatible four-conductor NL4) cable to ensure the correct operation of the B2 Bass Level Switch

Bose B1 and B2 cables are NL4 cables

You can use cables that are functionally equivalent.

What you need as a 4-wire Speakon, i.e. all 4 pins of the NL4 plugs need to be connected. The pins are named 1+, 1-, 2+, and 2-. The connection is one-to-one, for example, 2+ on one plug goes to 2+ on the other plug.

The wires inside the cable are usually arranged in a square pattern. Very long cable work a little bit better if the two signal pairs are connected diagonally like this:

1+	2+
2-	1-

2+ and 2-

The Power Stand detects resistors in the Bass Module across (2+ and 2-) that identify if the Bass Module is a B1 or B2.

• If B1, then adding a second B1 is detected and the Power Stand responds accordingly.
• If B2, the setting on the Bass Level switch changes the resistance and the Power Stand responds accordingly.

See Bass Line Out for more detail.

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