How weird is our world?

I figured! If arrow of fuse positioned towards cap, you'll get more depth and if contrary, you get more forward presentation. Ask manufacturer if there are fuses with up/down or around arrows if any to experiment more.

Fuse threads are a good indicator.

Only two choices. Try it each way and determine for yourself. If "directional" the difference should be apparent. Otherwise maybe not or defective. It ain't rocket science.

Switch directions several times to be sure. Sometimes merely removing and replacing an electrical device alone results in better contact and performance.

Thanks for responses. Experimented and it seems sound is better with arrow towards innards of amp. Facing out back seemed congested.