Free Tools

The Vault Toolbox

Free interactive audio tools — match your IEM, calculate power, test your seal, protect your ears.

—Power required
—Voltage required
Can your source push it?
⚠ Set your device volume to ~30% before playing tones. Insert your IEMs normally first.
The 30-second seal test
Sub-bass only exists with an airtight seal. Play each tone — a good seal makes 30–40Hz something you feel, not just hear. If low tones are faint or missing, your seal is broken.
How to read it
Sealed: 30–40Hz rumbles with physical pressure, clearly present vs the 1kHz reference.
Broken seal: 30–40Hz is faint or silent while 1kHz is loud. Fix: bigger tips, deeper insertion with a twist, or memory foam.
Step-by-step fit fixes: How to Wear IEMs Correctly
⚠ Start at low volume — high frequencies can be surprisingly sharp. Not a medical test; just for fun and curiosity.
What's the highest frequency you can hear?
Work upward. The highest tone you can clearly hear is your ceiling.
Typical ranges
Teens – early 20s 17–20 kHz
20s – 30s 15–17 kHz
40s – 50s 12–15 kHz
60+ 8–12 kHz
High-frequency hearing declines naturally with age — and faster with loud listening habits. Check the Safe Volume tab to keep what you've got. (Informational only, not medical advice.)
Reference points: 70dB ≈ conversation · 85dB ≈ city traffic · 95dB ≈ motorcycle · 105dB ≈ phone near max with sealed IEMs
8 hoursSafe daily exposure (NIOSH)
✅ Safe zoneVerdict
Why IEM users should care more
Based on the NIOSH standard: 85dB is safe for 8 hours, and every +3dB halves the safe time — 100dB is safe for only ~15 minutes. The IEM twist: a proper seal blocks outside noise, so you naturally listen quieter than earbud users fighting traffic noise. A good seal is hearing protection that sounds better.
Guideline only — not medical advice. If you notice ringing after sessions, turn it down and give your ears rest days.
Identify your connector
Look closely at the socket on your IEM shell (where the cable plugs in). Match the shape below — then we'll confirm the pin size.
The Alias Decoder — why the names are chaos
Sellers use a dozen names for the same few connectors. Translate any listing:
"QDC" / "C Pin" / "Type C" / "Paragraph C" / "ZSN pin" Hooded 0.75mm 2-pin (KZ-style). "Paragraph" is a mistranslation of "Type."
"Common 2-pin" / "Flat 2-pin" / "0.78" / "CIEM" Standard 0.78mm 2-pin (flush or recessed)
"Type A" / "0.75 flat" Flush 0.75mm (older KZ)
"Type B" / "Paragraph B" Angled 0.75mm KZ socket (ZST-era)
"TFZ" / "NX7" / "square 2-pin" Square-shroud 0.78mm — looks like QDC but isn't, and may be reverse polarity
"MMCX" Round snap-in, rotates — never cross-compatible with 2-pin
"A2DC" / "Pentaconn Ear" / "IPX" Proprietary — source cables from the original brand
Golden rules: (1) match the pin size — never force a 0.78mm pin into a 0.75mm socket. (2) A standard flush/recessed cable fits most same-size sockets, but a shrouded plug (QDC/TFZ) may not clear a plain shell. (3) TFZ/NX7 can be reverse-polarity vs standard 2-pin. Full guide: 2-Pin vs MMCX explained.
What do you want from new ear tips?
The 60-second tip theory
Bore width (the opening) shapes the sound: narrow bore focuses bass and warmth; wide bore opens treble, air, and stage. Material shapes the seal: foam expands for maximum seal + isolation (and softens treble); silicone is durable and consistent. Same IEM, different tips = noticeably different sound — it's the cheapest tuning tool in audio.
These free tools provide general guidance based on typical specifications and industry standards. Results are estimates — always verify connector type, sizing, and compatibility against your specific product's documentation before purchasing. Tone tests and volume guidance are informational only and are not hearing tests, medical advice, or a substitute for professional care. The Voltray Vault is not responsible for purchases or outcomes based on tool results.