I think for my use case a shotgun mic like the Sennheiser MKH416.
That depends, what’s your “use case”? Mics are designed for specific purposes; close use, more distant use, vocal use, instrument use, studio use, outside use, etc. The 416 is a shotgun mic, it’s designed for outside use at a distance. For many years it was the standard for film production sound, until it was superseded. If your “use case” is inside a small/moderate sized room, a 416 is the wrong mic for the job!
Unfortunately, you’ve been give more than a fair amount of incorrect information/advice. This really isn’t the right place to be asking such questions, you’re going to get a bunch of answers from people who’ve been indoctrinated with audiophile marketing and/or who know little or nothing about recording.
The more expensive the mic, the better it will pick up sounds like mechanical keyboard clacks, PC fans, coil whine and cars passing by.
No, that’s not the case. It depends on what the mic is designed for and of course basic economics such as availability. The most expensive mics are generally the vintage mics which are not particularly sensitive and have relatively high self-noise.
Those that have 'higher end inputs' like the MKH416, are also knowledgeable about plugins, and many other aspects of their setup.
The 416 isn’t really a high end input and isn’t appropriate for most indoor use. While it can be used indoors under certain circumstances, most likely these particular users are not very knowledgeable.
As to the SM7B, you're not going to get it to sing when all you have is 60 dB of amplification. That would suffice for recording snare drum with it, but for voice it won't.
If you need more than 60dB of pre-amplification, you’re using the wrong mic for the job or using the right mic incorrectly! Stating the SM7B won’t suffice (or is too insensitive) for voice is seriously incorrect, because it’s specifically designed for voice recording! It’s used in quite a lot of radio broadcast stations and the previous version (SM7) was used by Michael Jackson on the Thriller album. It’s designed for close use though.
I still find the mic sensitivity on condensers to pick up more room noise (or even outside noise depending on where I've lived) than my dynamic mic usage overall.
That’s not really true either. It depends on the design, the polar pattern for example but some condenser mic’s pick up less noise than dynamic mics. While condensers are generally more sensitive than dynamic mics, they’re more sensitive to everything, room noise and the desired signal, EG. They maintain the signal to noise ratio, SNR. However, this typically isn’t true in the high freq range, where dynamic mics are particularly insensitive.
$1500/pr for powered speakers are pretty low end in terms of audiophile use case, TBH. I wouldn't even start considering powered speakers until $10k.
That depends on what you mean by “audiophile use case”. If you mean expensive and fashionable then you’re probably right, but not if you mean accurate/high fidelity. For example a $5000 active speaker/monitor will typically be far “higher end” (hi-fidelity) in a properly treated room than a >$10,000 audiophile speaker in a poorly treated or untreated room. The speakers the OP have chosen are very good, commonly used by professionals.
Quality is all that matters. You generally get what you pay for up to a certain dollar amount.
Unfortunately that is often not the case in the audiophile world. In fact quite commonly the opposite is the case, assuming that quality = high fidelity.
Have you never met an "audiophile" who prized "accuracy' highly?
Yes, it’s a bit of paradox these days. An audiophile is defined as a hi-fi enthusiast but many audiophiles spend significant amounts on audiophile products that either make no difference to fidelity or actually reduce it.
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