looking for a more efficient speaker.....

I think you’re making up an amp problem where there is none.  The McCormack DNA-500 is a beast, and your amp almost doubles power to 900Wpc into 4 Ohms.  You’ve gotta be kidding me if you think that’s not enough power.  Look elsewhere for whatever issue you think you have.  This is absolutely silly. 

soix the issue is clarity not power, i went thru this with my wifes cj mf2500a and jeff told me to have it svcd.  its still not broken in yet due to my wife dont play it much and health concerns. it just might be this tube though. i notice i have good days and bad days with these stock 6922's

s bank you might be on to something,  but i talked to steve mc and he said he doesnt think it needs svc yet and i dont have problems with my ears so....

You’re going about it bass awards. Choose a speaker, then the amp to drive it.

sorry sbank i do have problems with my ears, on meds.....

soix  also i talked with dr lee at acoustic zenn, ask if there could be a problem with the wow II's since i got rid of the tara labs for the same reason.  he told me not to tighten the interconnects to tight this will alter the headroom and clarity and he was right, just fyi.......