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Preamp Observation: advantages to clean, advantages to color

I've used many preamps over the years that I've been recording and mixing, and while there are certainly still parts to the craft that I'm still learning - things I'm not sure of but pick-up on, as time passes and technology advances - and I have made a particular observation ... about preamps.

comb filtering

In acoustics, comb filtering can arise in some unwanted ways. For instance, when two loudspeakers are playing the same signal at different distances from the listener, there is a comb filtering effect on the signal. In any enclosed space, listeners hear a mixture of direct sound and reflected sound.

Sony/Sigma SS-302 Mixer.

I have a 3 channel mixer as per the title and have tried contacting Sony for information but to no avail, the response was that any item 7 years after production has ceased they cannot support (built in obsolescence).

Does any one have a User Manual or Service Manual for this Mixer (obviously any expenses incurred within reason I will foot), even a copy would be great.

blackjack and sm58

I Need help from the experts here. I want to record spoken word with garage band. I have a blackjack and two mics. An Audio-Technica condenser mic, and a Shure sm58. The volume when I use the condenser mic is great. I use the phantom power with the Audio-Technica. The volume when I use the sm58 is very low. I am using the XLR input into the blackjack. Do I need a mic preamp amp for the sm58?