As the jack and contacts wear, you'll get intermittent contact that makes those very loud popping noises when you jiggle the cord. Even when it's not worn, the weight of the plug and cord sticking straight out of the endpin causes uneven pressure on the different contacts - again leading to pops and noise. The unique design of the UltraJak has been awarded US Patent No. 5809136. Nobody else has this feature in a conventional endpin jack. Finally, there's a separate battery switch that preserves battery life while allowing stereo output.
Life can be complicated and difficult.
Your guitar' s pickup system doesn't have to be. We created the AmpJak to sound and work great with minimal modifications to your guitar. With the electronics mounted on the jack, you don't need to drill holes to mount an amplifier module, and no exterior drilling is required for knobs. The output level is set to an optimal level at the factory, but there's also a trimpot that lets you adjust the level for your specific needs. The AmpJak is available in kits with either the AT93 or AT125 pickup depending on the bridge width of your guitar.