The TRN MT1 is 22Ω at 106.0 dB (no reference unit printed); the TRN MT4 Pro is 40Ω at 113.0 dB (no reference unit printed). This page covers what they ask of an amplifier, not how they sound.
The MT1 needs 7.0 dB more than the MT4 Pro to reach the same loudness — 0.25 mW against 0.05 mW.
| Specification | MT1 | MT4 Pro |
|---|---|---|
| Impedance | 22 Ω | 40 Ω |
| Sensitivity | 106.0 dB | 113.0 dB |
| Sensitivity (voltage) | 122.6 dB/V | 127.0 dB/V |
| Power for 100 dB | 0.25 mW | 0.05 mW |
| Voltage for 100 dB | 74 mV | 45 mV |
| Current for 100 dB | 3.4 mA | 1.1 mA |
| Highest source impedance that leaves them alone (one-eighth rule) | 2.75 Ω | 5.00 Ω |
| Sources that reach 100 dB out of 280 | 280 | 280 |
One caution before reading the rows. TRN MT1 and TRN MT4 Pro printed a decibel figure with no reference unit, so this page reads it as per milliwatt. If it is really per volt, each of them needs far more than the table says. Why the two readings differ by so much.
Every source in the database that drives one of them drives the other. On power, the choice between these two changes nothing about what amplifier you need.
1 source is low enough in output impedance for the MT4 Pro under the one-eighth rule but not for the MT1 (Shanling H5).
14 sources stay below the audible-hiss threshold with the MT1 but cross it with the MT4 Pro (FiiO K11 R2R, Lake People G103-S Mk II, Schiit Valhalla 3, 11 more).
280 of the 280 sources here reach 100 dB on both.
The MT1 is more demanding than 23% of the 567 non-electrostatic models in this database; the MT4 Pro than 9%.
| dB SPL | MT1 power | MT1 voltage | MT4 Pro power | MT4 Pro voltage |
|---|---|---|---|---|
| 80 | 2.5 µW | 7 mV | 0.5 µW | 4 mV |
| 85 | 7.9 µW | 13 mV | 1.6 µW | 8 mV |
| 90 | 0.03 mW | 24 mV | 5.0 µW | 14 mV |
| 95 | 0.08 mW | 42 mV | 0.02 mW | 25 mV |
| 100 | 0.25 mW | 74 mV | 0.05 mW | 45 mV |
| 105 | 0.79 mW | 0.13 V | 0.16 mW | 80 mV |
| Source | Price | Headroom, MT1 | Headroom, MT4 Pro | Output impedance | Noise |
|---|---|---|---|---|---|
| JadeAudio JA11 | $20 | 19.1 dB | 26.8 dB | 0.5 Ω | 1.7 µV |
| FiiO KA11 | $29 | 29.4 dB | 35.0 dB | 0.7 Ω | 1.7 µV |
| FiiO BTR13 | $59 | 26.3 dB | 32.0 dB | 0.6 Ω | 1.0 µV |
Of the 280 sources here, 280 reach 100 dB on both. 55 of them also publish an output impedance low enough for both under the one-eighth rule and a noise figure that stays below the audible-hiss threshold with both.
The cheapest of the 55 is the JadeAudio JA11, at $20. It leaves 19.1 dB of headroom on the MT1 and 26.8 dB on the MT4 Pro, its output impedance is 0.5 Ω against a one-eighth limit of 2.75 Ω and 5.00 Ω, and its noise figure puts the hiss floor 13 dB and 8 dB below the 20 dB SPL this site treats as the point where a quiet room stops hiding it.
| Model | As printed | Tolerance | Standard |
|---|---|---|---|
| MT1 | 20Hz-20000Hz | not printed | not printed |
| MT4 Pro | 20Hz-20kHz | not printed | not printed |
TRN prints 20Hz-20000Hz for the MT1 and 20Hz-20kHz for the MT4 Pro.
Neither range has a tolerance printed beside it, so a wider range on one sheet is not deeper bass or more treble.
Not a measurement; maker by maker.
Both have a page of their own. In full: TRN MT1 and TRN MT4 Pro. Each figure on this page is labelled on those pages with where it came from, including the ones TRN never published — what that maker publishes, counted.