DMM gain question

[Crzy 10+ year member]

aright been testing my amps this way for a while now where tyo get desired ac voltage it is sqrt.(rms*ohmload)

i was testing my hifonics 2608 and it was reding 70 volts ac, thats 4600rms.... i dont think that was right

it was a 60hz test tone -3db. voltage was kept at 13.1-13.5 with minimal drop while amp was at full tilt.

what gave me this 70v reading? subsonic is at around 20 hz and lowpass is at 40hz. gain is around 3/4 of max. now i didnt play my hd with it at full tilt yet since im gonna let it break in for a bit, but the woofer barely has any excursion. i hear the bass feel it a little but nothing special, i assume more excursion and spl will come as the subs suspension softens?

when i re tested the amp while it was hooked up to the sub it only read around 14v spikes on certain songs, a little higher for some others, this was around half volume though so shouldnt it be reading 35v?

o ya impedence is 1.4ohm at the amp

anyone who could steer me in the right direction the help would be greatly appreciated.

usually with hifonics amps i have had a hard time to get to the ac volt to match rms rating of amp, but i never surpased it by 20v.

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[gunz4me 10+ year member]

You can overdrive just about ANY amp with a 0 dB test tone and no resistance on the outputs.

You could also have one of those stepping DMMs that was giving you mV readings instead of actual voltage.

Finally, you could have one of those mythical Hifonics amps that does more than rated power:

 

[Crzy 10+ year member]

ha i doubt it does over rated power, and dmm was on right setting. the resistance thing sounds about right though

any other input? i know you guys know about these things

 

[Crzy 10+ year member]

bump, what did i d o wrong or what should i try