Line 6 HX Stomp Battery Power with Mission 529M

I recently downsized my HX Stomp pedalboard, after establishing my workflow with the unit. I went to a battery powered solution for both portability and convenience. The goal was to be able to quickly set up the Stomp for playing or for mobile recording without having to think about finding an outlet nearby. Another desire was to take advantage of the Stomp's small size to play through it as much as possible.

HX Stomp with battery concealed underneath.

The Fix Pedalboards FP-7X Pedal Riser (6.75" x 5.125" x1.5") is approximately the size of the HX Stomp. I was able to comfortably fit an Anker 10,000 mAH battery, a Mission Engineering 529M power converter, and a USB coupler underneath the Stomp. 

HX Stomp with Pedal Riser.

The 5V 3A current rating of the Anker Powercore 10000 PD Redux is sufficient for the HX Stomp through USB PD, and provides about 3 hours of power. 

The 5VDC out of the PD output of the battery is converted to 9VDC using the Mission Engineering 529M. I went with the Mission 529M due to the Ionic Audio 5V to 9V converter being unavailable for purchase for an extended amount of time.

Battery cabling under Riser.

The 2.1mm center negative output of the 529M needed a combination of Truetone CYR (reverse polarity) and CL6 (2.1mm to 2.5mm, reverse polarity) adapters to interface with the 2.5mm center negative input of the HX Stomp.

A USB coupler is used to reduce wear and tear on the HX Stomp's USB port.

I keep the HX Stomp in an Apache 2800 case from Harbor Freight.

I hear less background noise through my headphones when the Stomp is running on batteries. Whatever noise I was getting previously was likely due to dirty power, desktop fans, sharing a power strip with multiple pieces of equipment, etc. I don’t know if it comes through on recorded DIs, but it is a much more pleasing experience to be monitoring my signal with less noise.

Edit - 11/1/21 - I was successfully able to power my Steinberg UR44 audio interface using the Mission 529M set on 12V. The UR44 requires center positive DC, which was achieved through a polarity inverting cable. The UR44 is not buss powered through USB2, but the 529M along with the Anker battery should provided hours of operation with phantom power engaged.

Going forward, I plan on doing remote acoustic recording with the UR44 and DI recording with the HX Stomp into my iPad Pro. I can do both without the need for an AC outlet nearby.