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ijabbott · (This post was last modified: 12-26-2023 05:32 PM by ijabbott.)

(12-24-2023 03:13 PM)robve Wrote: Experimenting a bit with Audacity shows that the recorded wav file amplitude is too low. Converting the wav file with +20dB and playing it at max volume worked. I don't know if this is a peculiar thing of my FA-2, so perhaps others don't need as much as +20dB amp up.

I think the recording level is a bit low compared to line level (but it is intended to drive the microphone input of a cassette recorder). I did mono recordings from two different FA-2 interfaces and an FA-1 interface in Audacity via a cheap, USB audio interface. I couldn't get a signal when connecting the FA's microphone (white) jack directly into the pink, stereo 3.5mm microphone socket, so I connected the FA's microphone jack to a mono 3.5mm to RCA adapter, which was connected to the left input of a dual RCA to stereo 3.5mm jack, which was connected to the pink microphone input of the USB audio interface. Audacity was set up to record a mono track from the left channel.

After recording from each FA interface in Audacity, I selected some of the main part of the recording (after the end of the lead-in tone) and used the Analyze -> Measure RMS option. I got the following results:

FA-1: −28.6 dB
First FA-2: −32.4 dB
Second FA-2: −29.9 dB

I used the same, fresh batteries in both FA-2s. The FA-1 does not use batteries.