I'm the one making comparisons in similarities between the 414 and the SP B1/B3. I don't know that anyone else is yet. The two mics are similar in that they are fairly neutral and extremely versatile over a wide variety of applications. The 414 has a brighter top end. The B1/B3 will sound better on more people as a vocal mic than the 414 - although, the 10% or so of people who do sound good on a 414 sound amazing.
I am not belittling the 414. I've used them for 20 years, EB, B-ULS and TLII versions. The 414 is my single favorite large condenser mic. But I am saying if you're just starting to build a mic collection, that the B1 is a killer mic. I even recommend it as a first mic in a recent article,
A step-by-step guide to building a mic cabinet.
The comparison of the 414, the 57 and the B1/B3 is that they are WORKHORSE mics - meaning you can use them for more applications than most other mics. The C1, for example, is a great vocal mic, good on amps and can be used on kick in a pinch. The C1 is a lousy mic for acoustic instruments, IMO.
Most mics you're lucky if you can use them for three or more applications. I haven't found an application yet where the B1 hasn't worked - although it might not work on kick and bass amp - but, who knows. I'll know this week.
I've also used the B1/B3 for live applications and it sounded great with no feedback problems on main vox and also a pair on a choral group.
Studio Applications:
Vocals: 414 - 10%, B1 - 75%, 57 - 10%
Acoustic gtr: 414, B1
Piano: 414, B1
OH's: 414, B1
Toms: 414, B1
Snare: 57, B1
Percussion: B1
Kick: N/A
Amps: Cone mic 57, Cab mic B1, 57
( 414 is usually not a first choice for amps, but works )
Stereo miking: 414, B1
Room mic: 414, B1
Bass: N/A
Brass: 414, B1
Woodwinds: 414, B1
My point is that you'll see the B1 listed as being a good mic for more applications than either the 414 or the 57. And that would make the B1/B3, arguably, one of the most versatile mics in the world. I think that's a pretty worthy accomplishment.
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Dan Richards
Digital Pro Sound
The Listening Sessions