There was talk about the frequency response of this unit awhile back. Here is a sweep test of it. There is some distoration, clipping of the very low frequency, otherwise it looks pretty flat.

As the level is turned up the clipping of low frequencys increases.

Frequency response of Radio Shack ground isolator. Bottom trace if output from sweep generator, top trace is out of unit. Sweep if from 40 HZ to about 15 KHz. Voltage of input and output is apx. 1.25 volts.

:There was talk about the frequency response of this unit awhile back. Here is a sweep test of it. There is some distoration, clipping of the very low frequency, otherwise it looks pretty flat.
:
:As the level is turned up the clipping of low frequencys increases.
:
:Frequency response of Radio Shack ground isolator. Bottom trace if output from sweep generator, top trace is out of unit. Sweep if from 40 HZ to about 15 KHz. Voltage of input and output is apx. 1.25 volts.
:
:
::

I regularly use the smallest 120 to 6-0-6V transformer as an impedance matching transformer to feed audio from my computer or iPod into my radios. I usually connect half of the secondary to the audio source, and connect the 120V winding to the audio input on my radio. Audio sounds pretty good, and is boosted to a decent level. The bass and treble response are quite nice. On a few of my radios I have removed all tone capacitors, and added negative feedback, and also added a small tweeter cone to the speaker to make it co-axial, and the treble response is surprising. It is also surprising that a small filament transformer can perform so well over such a broad frequency spectrum.

T.