Appendix C: Microphone Selection Guide

This is the page you reach for when you're standing in front of a source — a singer, an amp, a podcast guest — and you have to point something at it. Chapter 7 taught you how the three transducer types work and what each one does to sound. Chapter 11 taught you to record vocals; Chapter 12 taught you to record everything else. This appendix collapses all of it into one buyer's-and-user's reference: what each mic type actually is, when to reach for it, and a source-by-source table that tells you the right pick — and the right budget pick — for every job a bedroom record throws at you.

One law before the tables, because it governs every recommendation on this page. Demi Wren learned it back in Chapter 7, the day Theo ran a blind test: her voice on a $99 dynamic, placed six inches off-axis in the deadest corner of the room, against the same voice on a $1,000 condenser shoved into a reflective hallway. The cheap mic won, and it wasn't close. A $99 mic placed right beats a $1,000 mic placed wrong, every single time. Placement, room, and source are worth more than the price tag — usually by an order of magnitude. Read every table below through that filter. The mic you choose matters. Where you put it matters more.

The Three Transducer Types

A microphone is a transducer: it converts sound pressure into a voltage your interface can capture. There are three common ways to do that, and the how determines the what-it's-good-for. These aren't quality tiers. A ribbon isn't "better" than a dynamic — it's a different tool for a different job, the way a flathead isn't better than a Phillips.

Dynamic — the workhorse

A dynamic mic moves a coil of wire through a magnetic field — a tiny speaker run in reverse. That coil has mass, and mass is the whole story. It makes the mic slower to respond (which gently rounds off harsh transients), nearly indestructible, and capable of swallowing enormous sound pressure without flinching. It also makes it less sensitive, so it hears less of the room and needs more clean gain from your preamp.

Reach for a dynamic when the source is loud (a guitar amp, a snare, a screamer), the room is untreated (the mic's tunnel vision rejects reflections you didn't want anyway), or you're recording speech in a normal-sounding space. This is why the broadcast-standard dynamic is the podcaster's best friend: Aisha's office sounded like a bathroom on a sensitive condenser and like a studio on a dynamic held close, because the dynamic simply didn't hear the bathroom. A dynamic forgives the room you couldn't afford to treat.

The tradeoff: less detail and air than a condenser, and it needs more gain — which means a noisier preamp shows its hiss faster. On a quiet, breathy source in a treated room, a dynamic can sound slightly veiled next to a good condenser.

Condenser — the detailed one

A condenser uses a thin, electrically charged diaphragm millimeters from a fixed backplate; sound moves the diaphragm, the capacitance changes, and that change becomes signal. The diaphragm is nearly weightless, so it tracks fast transients and high-frequency air the dynamic rounds off. That sensitivity is the gift and the bill: a condenser hears everything, including the reflection off your window and the fridge two rooms over.

Reach for a condenser when you want detail — the breath on a vocal, the string sparkle on an acoustic guitar, the shimmer on a cymbal overhead — and you have a room quiet and treated enough to deserve that detail. In a good space, nothing captures intimacy like a large-diaphragm condenser on a vocal.

Two non-negotiables. First, a condenser needs phantom power (+48V, the button on your interface from Chapter 3) — it has active electronics that need feeding. Second, a condenser will faithfully record your bad room. Put it in an untreated space and it'll hand you the reflections, the HVAC, and the street. That's not the mic failing; that's the mic doing its job on a room that wasn't ready.

Ribbon — the smooth one

A ribbon mic suspends a wisp of corrugated metal foil in a magnetic field. It's a dynamic by physics but a different animal by behavior: smooth, dark, with a naturally rolled-off top that tames harshness before it starts. Ribbons are figure-8 by nature (more on patterns below) and famously fragile — a vintage ribbon can be damaged by a strong blast of air, an aggressive close-mic on a kick, or careless handling.

Reach for a ribbon when a source is harsh or fizzy and you want it tamed at the source: a bright trumpet, a spitty guitar amp, a too-crisp room. Ribbons are gorgeous on brass, electric-guitar cabinets, and as a darker room mic that adds body without sizzle.

The one rule that protects expensive ribbons: never send phantom power to a vintage ribbon. A wiring fault or a hot-patched +48V can fry the foil instantly. (Many modern active ribbons require phantom power and are clearly labeled as such — read the manual. The danger is the classic passive ribbon meeting a phantom button left on from the last session.) Ribbons are a later purchase, not a first mic — but when you have one, they do something no condenser can fake.

🔄 Check Your Understanding 1. Your podcast guest is in an untreated spare room. Which transducer type, and why? 2. You just bought a passive vintage-style ribbon. What's the one switch you must never engage with it plugged in?

Verify

1. A dynamic, held close. Its low sensitivity rejects the room's reflections, so the untreated space stops mattering — the fix Aisha used. A condenser would hand you the bathroom-sound. 2. Phantom power (+48V). It can destroy a passive ribbon's foil. Confirm it's off before you plug in, and on the right channel.

Large-Diaphragm vs Small-Diaphragm Condensers

Condensers come in two body styles, and they're genuinely different tools.

Large-diaphragm condensers (LDCs) — diaphragm roughly an inch across — are the classic vocal mic. They tend to flatter: a gentle low-end weight, a presence lift around 5 kHz that makes voices "pop," a larger-than-life character. They're the default reach for lead vocals, voiceover, and any source where you want size and personality. If you buy one condenser, buy an LDC.

Small-diaphragm condensers (SDCs) — pencil-style, diaphragm under half an inch — are the precision instruments. They track transients faster and measure flatter, which makes them honest rather than flattering. Reach for SDCs on acoustic guitar, hi-hats, drum overheads, strings, and anything where you want accuracy and fast attack over character. They're also the standard for stereo pairs (XY/ORTF — Chapter 12) because matched SDCs image tightly.

The shorthand: LDC for character and voices, SDC for accuracy and detail. A bedroom locker rarely needs both early; the LDC covers more ground for most readers.

Polar Patterns, Recapped

A polar pattern is the map of where a mic hears and where it's deaf. You met these in Chapter 7; here's the practical-consequences version, because the pattern you choose changes the recording as much as the mic does.

   CARDIOID            OMNI            FIGURE-8
       0°               0°               0°
       ▲                ●                ▲
      ╱ ╲             ╱─────╲           ╱ ╲
     │   │           │       │         │   │
  ───┤ ● ├───     ───┤   ●   ├───   ───┤ ● ├───
     │   │           │       │         │   │
      ╲ ╲╱            ╲─────╱           ╲ ╱
     (rejects)                          ▼
      180°             360°            180°
   hears front     hears all around  hears front
   rejects rear    no rejection      AND back,
                                     deaf to sides

   Use: isolation,   Use: natural,    Use: two sources
   untreated rooms,  no proximity,    facing each other,
   single source     good rooms only  mid-side, room tone

The three patterns you'll actually use, drawn as the zones each one hears (●) and rejects.

Cardioid hears the front, rejects the rear. It's the default for almost everything because it isolates the source from the room and from other instruments. The catch is proximity effect (Chapter 7): the closer you get to a cardioid, the more bass it adds. That's a warmth dial — lean in for a richer voice, back off if it's getting boomy. Super- and hypercardioid are tighter cousins with even narrower front pickup and slightly more rear sensitivity; reach for them when you need maximum rejection of bleed (a loud stage, a leaky room), at the cost of a smaller sweet spot the performer has to stay inside.

Omni hears everything equally, all around. The trade is sharp: you give up the room rejection, but you gain the most natural, open sound and zero proximity effect — no bass build-up as you move in. An omni is a glorious choice on a vocal or acoustic guitar if your room is good, because it captures the instrument plus the air around it as one believable event. In an untreated room, omni hands you the room, full stop. Great room or don't bother.

Figure-8 hears front and back equally, dead to the sides. It's the ribbon's native pattern and a switchable mode on many LDCs. Two uses earn their keep: putting two singers or instruments face-to-face on one mic, and the mid-side stereo technique (Chapter 25's M/S concept, captured here). The side nulls are also a precision tool — aim a fig-8's deaf side at a bleeding source to reject it surgically.

USB vs XLR — the Honest Beginner's Take

There's a tribal answer to this question and an honest one. The honest one: a USB mic is a perfectly good start, and XLR is the road that scales.

A USB mic has the interface built in — converter and preamp inside the body — so it plugs straight into your laptop. For a podcaster, a songwriter capturing demos, or anyone who needs to be recording tonight, a decent USB mic removes every excuse. The audio quality of a good USB condenser or dynamic is genuinely fine. Aisha could have launched her whole podcast on one.

The ceiling shows up when you grow. A USB mic gives you exactly one input — you can't mic a guest and yourself on the same recording cleanly, can't run a stereo pair, can't swap the mic without swapping the whole signal chain. An XLR mic plugs into an interface (Chapter 8), which means: multiple inputs, real preamps you can upgrade independently, phantom power for condensers, and a mic you keep even as everything else around it improves. The XLR mic you buy at $99 still works when you own a $2,000 interface.

The decision: start USB if it gets you recording today and you only need one source. Buy XLR the moment you need a second input or know you're staying. Don't agonize. The mic in your hand beats the mic you're researching.

🔍 Why Does This Work? Why does a $99 XLR dynamic outlast a $200 USB version of "the same" mic? Because the USB mic welds three components — capsule, preamp, converter — into one box, and converters and preamps improve faster than capsules do. When you outgrow the preamp, you've thrown away the capsule too. The XLR mic separates the part that ages slowly (the transducer) from the parts that age fast (the electronics), so you replace only what's outdated. It's the same logic as buying a body and lens separately instead of a fixed-lens camera.

Source-by-Source Recommendations

These tables give the type, pattern, and position that work, plus a budget alternative for every row. "Type" is the priority; the named categories are classes of mic, not brand endorsements (the broadcast dynamic, the entry LDC, the pencil SDC — you'll find specific models in Appendix I). Every position assumes you've already done the room and placement work from Chapters 10–12, because that's where the real quality lives.

Vocals

The lead-vocal rule from Chapter 11: match the mic to the voice and room, not to a chart. A bright voice in a live room wants a darker dynamic; a thin voice in a treated room wants the flattering LDC. Rap and loud delivery lean dynamic — it eats high SPL and ignores the bedroom.

Spoken word

This is the dynamic's home turf. Close-miced dynamics on each speaker reject the room and reject each other, which is the entire battle in untreated, multi-person recording. A sensitive condenser here is a trap — it'll hand every speaker the whole room and every other voice's bleed.

Acoustic instruments

The acoustic-guitar law from Chapter 12: aim at the 12th fret, never straight at the soundhole, or you'll capture the boom that buries the mix (the cut you'd otherwise fight in Appendix A). The SDC's fast transient response catches pick attack and string detail an LDC slightly softens.

Amps and electric instruments

Two field notes. The standard $99 stage dynamic on a guitar cab is not a compromise — it's the actual professional default, on countless records you love. Move it from the cone's center (bright, fizzy) toward the edge (warm, rounder) to tune the tone with placement before you ever touch EQ. For bass, the DI-first doctrine (Chapter 12): take the clean direct signal always — it's reliable, phase-coherent, and re-ampable later. Blend an amp mic only if you want its grind, and flip-test the phase when you do.

Drums

Drums are where mic philosophy shows up most, because you're choosing not just mics but a whole approach to how many you use. Here's the ladder from one mic to many.

Most bedroom readers won't mic a real kit at all — they'll program drums (Chapter 13), which is why this section is a when-you-need-it reference. But the principle scales down: the Glyn Johns method (Chapter 12's case study, the sound on records you know) proves that three well-placed mics beat eight badly placed ones. With drums, every added mic adds a phase relationship you have to manage. Fewer mics, placed by ear and measured for phase, is the honest path on a budget.

Room and ambience

A room mic captures the space as an instrument — but only worth doing if the space sounds good (Chapter 10). In a treated, characterful room, a distant mic blended under close mics adds depth nothing else gives. In a bad room, skip it and add artificial space at mix time (Chapter 24). The room mic is the ultimate expression of the law on this page: the room is the recording, and the mic just witnesses it.

🔄 Check Your Understanding 1. You're micing an acoustic guitar and it sounds boomy and tubby in the recording. What placement mistake did you probably make? 2. Why is the same $99 dynamic the first choice on a podcast voice and a guitar amp, two totally different sources?

Verify

1. You aimed at or too near the soundhole, which radiates low-frequency boom. Move to the 12th fret. (Chapter 12.) 2. Both jobs reward the dynamic's strengths: it shrugs off high SPL (loud amp), it rejects the room (untreated podcast space), and it's robust. Different sources, same problem profile — loud and/or roomy — so the same tool wins.

The "Which Mic?" Decision Flow

When you're unsure, walk this. It encodes every recommendation above into four questions.

START: What are you recording?
  │
  ├─ Is the source LOUD (amp, drums, belter)?
  │     └─ YES → DYNAMIC (it eats SPL, rejects room) ──────────┐
  │                                                            │
  ├─ Is your room UNTREATED / noisy?                           │
  │     └─ YES → DYNAMIC, close-miced (it ignores the room) ───┤
  │                                                            │
  ├─ Is the source HARSH / fizzy and you want it tamed?        │
  │     └─ YES → RIBBON (smooth, dark — never +48V on vintage) ┤
  │                                                            │
  └─ Treated room + you want DETAIL/air?                       │
        ├─ Voice or character source → LARGE-diaphragm condenser
        └─ Acoustic detail / fast transients → SMALL-diaphragm condenser
                                                               │
                              ┌────────────────────────────────┘
                              ▼
        THEN: cardioid by default. Omni only if the room is good.
              Fig-8 for two-facing sources or mid-side.
                              │
                              ▼
        ALWAYS: placement and room first. A $99 mic placed right
                beats a $1,000 mic placed wrong.

The four questions that pick a mic, ending where every mic choice ends — at placement.

The Mic Locker on a Budget

Here's the punchline of the whole appendix, and it's deliberately small.

One good dynamic and one large-diaphragm condenser will cover roughly ninety percent of bedroom work. The dynamic handles loud sources, untreated rooms, podcasts, rap and aggressive vocals, and guitar amps. The condenser handles detailed vocals and acoustic instruments once your room is quiet enough to deserve it. Between them, that's vocals, voiceover, acoustic guitar, amps, percussion, and room tone — the entire menu most readers will ever cook from. This is exactly Theo's kit in the running story: one good condenser, one stage dynamic, a two-input interface, and an EP that sounds like money because the placement and the room carried the weight the price tag didn't.

What to add after those two have earned their keep, in order: a matched pair of small-diaphragm condensers (the moment you record acoustic guitar or drums in stereo), then a ribbon (when a recurring source is too harsh and you want it tamed at the source). Notice what's not on the early list — a second LDC "because variety," a boutique mic that duplicates what you own, a microphone bought before you've fully learned the one in your hand. The amateur buys mics; the professional buys the room and learns placement, then buys exactly the mic the next source demands.

Two mics, placed right, in a room you've treated for the price of a dinner out. That's not the compromise version of a studio. On record after record, that is the studio. Tape this page up next to Appendix A — one tells you where every frequency lives, this one tells you what to point at the source making it. Then go capture something, because the mic in your hand is always the best one you own.