( I would suggest a low or mid-level Mic-Preamp with built-in compressor and equalization. If you are on a budget, you may want to start with something like an ART Studio tube preamp, they cost somewhere in the the neighborhood of $30.00 to $60.00. There are hundreds of mic preamps on the market, so choose what you can afford and choose wisely. Getting the most out of ESSB and external processing will have the best results when both the transmitting and receiving stations have good bandpass filters for both transmit and receive.
I’ve been running ESSB for years and I can tell you in my experience it is still is worth the trouble, because external processing can yield noticeable improvements over a stock mic even at a lower frequency responses. For this reason some operators feel the need to do ESSB is not worth the trouble. Most amateur or CB type radios don’t receive over 2.8 Kilohertz wide (some quite a bit less), so producing big audio is not going to be perceived on the receiving end unless the receiver has filters that listen out wider in their frequency response. Tech Note: One relevant thing to consider is how the other end (Receiver) perceives your audio.
Some radios may be a little wider than others in their bandpass, so they may sound a little better than others, but rest assure any radio you setup like this will be a major improvement over the default stock mic, and even better than other power mics, and some rigs can be modified for improved bandpass response as well. However, you can achieve a much better transmit audio on nearly any radio using the methods described here. Keep in mind however, that most CB class radios will not sound as good as a higher end HAM rigs due to bandwidth limitations on CB radios. Obviously, the better the mic preamp and microphone, the better success you will have with your audio setup at least on paper, however buying more expensive gear may not produce enough audible perception through your rig to warrant the extra costs. If you decide to use a dynamic type of microphone (SM57, SM58, etc.), you do not necessarily need a mic preamp, however unless your radio has a very good mic gain control, you will have difficulty getting your gain up high enough to sound good, so a preamp is highly recommended for both microphone types. You must use a mic preamp or a device capable of powering up the microphone if your going to use a condenser type microphone.
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