I tried the test with some AGK headphones and I could hear 30Hz to 8khz. Nothing above that.
I listened to my old Altec Santana speakers hooked up to two SAC La Forza Mono power amps fed by a Lynx 22 audio card in my home office and there I could also hear the 30 HZ very well ( I was surprised hear that the Altecs go so low!) and even the 12khz signal. I an 58. Not bad I think !
The only thing not so nice is that I suffer tinitus, so I often have that high pitch sound acompanying me.
I listened to my old Altec Santana speakers hooked up to two SAC La Forza Mono power amps fed by a Lynx 22 audio card in my home office and there I could also hear the 30 HZ very well ( I was surprised hear that the Altecs go so low!) and even the 12khz signal. I an 58. Not bad I think !
The only thing not so nice is that I suffer tinitus, so I often have that high pitch sound acompanying me.