[TenTec] Proset Quiet Phone vs TenTec 777 with the Orion I

[AL7CR]

I have recently begun doing some SSB skeds using my Orion I and a Heil Proset Quiet Phone headset.  I acquired the headset at SeaPac a few years ago but have only now really begun to use it.  My only complaint is that I can not get adequate volume with this setup even at max audio gain on the Orion.  Does anyone else have experience with this combination and perhaps a fix?

I am also curious as to comparisons between the Heil Headset and the new TenTec 777 particularly regarding the efficiency of the speakers.

Thanks in advance for any help.

Dean Shutt,  AL7CR