Q: Can I use an extension speaker with my Fender Hot Rod Deluxe amplifier without using the built-in speaker?

A: Yes, in fact, there are three ways to connect external speakers. The Hot Rod Deluxe has two speaker outputs, the main one, which is by default connected to the internal speaker, and the external speaker jack. Both of these are found on the bottom of the chassis, inside the amp enclosure.

The first thing to do is to unplug the internal speaker from the main speaker jack. Now you have your choice of three options:

1. Plug an 8-ohm speaker into the main speaker jack.

2. Plug two 8-ohm speakers in, one into the main speaker jack and one into the extension speaker jack.

3. Plug a 4-ohm speaker into the extension speaker jack. But in order to do so, you must also insert an "open" plug in the main speaker jack (a plug that's not connected to a speaker), so that the proper impedance is maintained.