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Originally Posted by Bass Catcher  I've been researching the AMT S25 mic and I'm confused as to what the difference between the different pre-amps is. I have read descriptions of both, but as my "gear vocabulary" is somewhat limited, I don't really understand. Can someone explain it in simple terms for me? Thanks! |
The S25B has just an interface box with an XLR output. One would usually choose that if you're running to an amp or to a PA board, or if your amp has the bells and whistles the SP25B preamp box has.
The SP25B has a more fully featured interface box; these are the details from my web site:
The 'super pre-amp' has 3 outputs, including two XLR outputs. One is the regular output for standard use, the red one is the isolation transformer. If you are playing with a PA and start to hear a 'hum', move the connection from the standard XLR output to the isolation or red output. to eliminate this. The ¼ inch output is your line driver, normally used with a standard musical instrument amplifier, with the XLR signal to the house PA or recording device. The Pre-amp works with phantom power or a 9-volt battery; a battery is required by the circuitry even when phantom power is used.
The external volume control is for the line driver/¼ inch output. The preamp also has an internal volume control in the final gain stage that you can adjust with a screw driver, used only if more or less gain is required to match the gain on your amplifier
One might choose this if they wanted a simple and compact box from which they could send a
¼ inch cable to their amp on-stage and also send a signal to the PA via XLR. However, many amps have features that would make the box superfluous.
Also, given the difference in price between models is $250+, we've often suggested players grab a D-TAR Solstice or similar preamp to pair with a S25B, instead of the SP25B. It's just a few more bucks for a lot more features, unless their gigging travels and stage situations are more appreciative of the smaller AMT SP interface box.
