These are the different preamps we make at Church Audio
ST-20A This preamp has two fixed gain settings +6db and +30 db it has 3.5 mm input (stereo) and output it has a built in belt clip. Frequency response is 20hz to 90khz +- 2 db
ST20B This preamp has two fixed gain settings +6 and +30 db it has a 3.5 mm input (stereo) and output it has a built in high pass filter at 80hz, power led, it also has a auto on feature when the mic is plugged in it turns on the preamp Frequency response is 20hz to 90khz +-2db
ST-9000 This preamp has three gain settings -0db +10db +30db it has a built in high pass filter at 80hz it has a audio distortion led (clip light) and power led. And a output level control knob. Frequency response is 20hz to 90k +-2 db we use a burr brown or TI chip in this product
ST-9100 replaces ST-8 preamp This preamp comes in three wire or two wire with a built in clip light power light and high pass filter it is flat from 20hz to 40k +- .2db We use a burr brown op amp in this preamp. It provides -00 db to +20 db of gain via a gain control knob.
ST-1000 This is your simple battery box that has a high pass filter and on off switch built into the mic jack this is available in a 2 wire or three wire box.
The common features of all of these preamps are
Size 3.5 inches x 2.5 inches x 1 inch
Belt clip (can be ordered with out)
ABS plastic hard shell case
Your Choice of Highpass filter frequency on ST-9000 series preamps
I'm confused....
I thought the Sound Professionals preamp was the one with the -20/+20 db switch. There is a "Chris" at SP.
I though the Church Audio preamp had the variable gain from 0 thru 20db. There is a "Chris" at Church Audio.
Does Church Audio also make a -20/+20 db switchable preamp?