Gene Poon wrote:
DOA wrote:

I own some old bose Speakers which I am in the process of getting
rid
of and I thinking of buying more Gallo Acoustic speakers. Thats
when
I began hearing the speaker hiss I didn't notice it on my old Bose
speakers and with my parnoia of buying these Gallo speakers off of
ebay set in and I thought something was wrong.

Well, hiss is mostly high frequency energy

No, it's not. Most of the generators of noise in this context
have a distribution akin to "white", which has a frequency
distribution that is the same per net constant bandwidth,
independent of center frequency. That is, the amount of
energy in a 1 kHz band at lower frequencies (e.g. 0 to 1 kHz)
is the same as a 1 kHz band at higher frequencies (e.g. 10kHz
to 11 kHz).

You might counter with the correct statement that an OCTAVE of
noise at high frequencies has more energy than on OCTAVE of noise
at low frequencies, but that's simply because the octave itself
has more total bandwidth at high frequencies than at low. For
example, an octave centered around 10 kHz extends from about 7100
Hz to over 14 kHz, a bandwidth of 7100 Hz, while an octave at
100 Hz extends from only 71 to about 141 Hz, only 70 Hz wide.