Super, and thanks!
We were not at all impressed with the audio on GNR and it has everything to do with the hardware (amplifier, cabinet speaker and tweeters). The track itself is amazing once you liberate from the hardware, and put the PinWoofer system in play.
Until we received our copy of GNR in March we had no idea how bad the backbox sounded and unfortunately, the CE sound bar.
We set to work to fine tune the title. Also, we completed development of the tweeters and made them available to our past JJP customers with an emphasis on getting all of the GNR's upgraded. All late JJP systems (DI! and later) now ship with the tweeters included.
The factory tweeters distort at low volume levels, sound "grindy" and prevent you from getting any sort of appreciable amplitude. The PinWoofer system cleans up the backbox nicely and allows you to break through and play loudly with a clean result. Our amplifier provides the headroom you need to get a well defined (stereophonic) sound field. We're extremely pleased with the outcome. Below are a few testimonials:
https://pinside.com/pinball/forum/topic/the-official-jjp-gnr-thread/page/191#post-6278425
https://pinside.com/pinball/forum/topic/the-official-jjp-gnr-thread/page/172#post-6244029
https://pinside.com/pinball/forum/topic/the-official-jjp-gnr-thread/page/166#post-6233932
https://pinside.com/pinball/forum/topic/the-official-jjp-gnr-thread/page/160#post-6223595
If you have any questions just say so - happy to help!