Next, we turn to the biggest difference, the frequency response charts. They are similar but certainly not the same. Note the amount of +5 dB boosts between the two. Also, the PGA57 has a slow cut to frequencies below 600 Hz. while the SM57 shows only a small dip between 300 and 600 Hz and then a sharp decline at 200 Hz. And while response in the 4,000 to 10,000Hz. range is similar in both, it’s greater in the SM57 with a 6-7dB boost around 6,000Hz., whereas the PGA57 has minimal boosts in that 4,000-10,000Hz. range.
These two microphones work on the snare, are made by the same company, work in the same way, with the major differences being in the frequency range and the frequency treatment. The bottom line is, if both microphones were used on the same snare with the same drummer, you’d get two different sounds comes through the channel. Similar, but different.
Bigger Changes
Comparing the Shure Beta87A and Beta58A, both vocal microphones, shows how different vocal microphones can sound based on the same source.
The 58 is a dynamic and the 87 is a condenser, so right from the start, the 87 will detect more nuances in the captured sound. Both are super-cardioid polar patterns. However, the frequency responses are different as can be seen above the 2000 Hz. mark.
Why Vocal Mic Differences?
Why would two microphones built for the same purpose alter sound differently? It goes back to a key piece of live audio production wisdom: A great mix starts with getting the best sound at the source.
