JM-4 Features:

Backing Tracks: 71 Song Loops and 81 Drum Loops (arranged by Tempo) for a total of 152 pre-recorded backing tracks.

Recording Time: of up to 33 minutes.

36 User-Programmable Preset Locations: (Banks 01-09, A-D). The Artist/Song Presets locations CANNOT be overwritten, but are modifiable and storeable to any of the 36 User-Preset Locations.

Inputs: 1/4" Instrument (guitar, bass), XLR mic (no Phantom Power), CD/mp3 player (1/8" stereo input), 1/4" Auxiliary.

Outputs: Dual-mono audio signal appearing in both left and right outputs on amplifier and headphone jacks.

Product Dimensions:  12.5" (L) x 7.5" (W) x 3.25" (D)

Weight: 4.1 lbs.

Power Adapter: included Line 6 PX-2 only (Specs: 9V, 2000mA, center tip positive, 2.5mm diameter). No battery power option available.

SD Memory Card: 16-bit Mono/44.1K .wav file (ONLY) import capability, 2 GB maximum capacity; SD Card NOT INCLUDED. Card function is for transferring of properly formatted .wav files from computer to JM-4; will NOT record to SD Card directly whatsoever.

Note: Only SD Cards function properly; there is no support for usage of mini-flash cards with an SD Card adapter. For reference on functionality of SD card related tasks, please refer to the JM-4 Advanced User’s Guide, found on the  Manuals page.

Known Issues

-Quick Capture = Hold the UNDO switch and then hold down REC switch (not REC + UNDO as it is silkscreened on the unit). In other words, first step on UNDO switch and keep it held down while also stepping on REC switch.

-The "Clip" LED lights up upon powering up the JM-4. This is normal power-up behavior.

-Some of the Artist/Song Presets from the original Spider III release were not included in the JM-4 release due to space restrictions.

-The Guitar Tone Presets (70’s sounds by Song Title) are simply guitar tones. They are not backing tracks. The backing tracks on the JM-4 are original compositions written and recorded by studio musicians specifically for Line 6 Spider Jam and JM-4 products.

Registration & Warranty

Q: How do I register my JM-4?

A: You can register any Line 6 product to your account here: Registration.

Q: What is the warranty on the JM-4?

A: Twelve months from the date of purchase. Authorized Line 6 Service Centers will need you to provide a copy of the purchase receipt to validate date for warranty processing. Please be sure to have those materials ready, should you need to get your unit serviced under warranty.

Troubleshooting & Service

Q: How do I troubleshoot my Line 6 Pedal?

A: Please refer to the Line 6 Pedal Troubleshooting FAQ

Q: How do I perform a Factory Reset on the JM-4?

A: Power on the unit while holding the Settings/Tone button down for 5-8 seconds.

Q: I’m hearing this background noise present when using the JM-4, what should I check?

A: Check to make sure the Mic Trim knob is turned OFF when not using the microphone input.

Replacement Parts & Manuals

Some replacement parts are available from the Line 6 Store.  If you are looking for the manual, please go to the Manuals section.