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- | Test procedure for XR18 vs MR18 measurement. | + | ==== Introduction ==== |
- | ==== T1 - Inner Noise ==== | + | This document proposes a test procedure and results comparing Behringer XR18 and Midas MR18 performance. |
+ | |||
+ | ==== Disclaimers and Claims ==== | ||
+ | |||
+ | Starting with a general statement: Measurements are done as close as possible to what would be a scientific measurement process (Configuration and tests are documented, are reproducible by a third party, tests results are published, known assumptions and limitations are mentioned as far as possible). | ||
+ | |||
+ | Now the claims: | ||
+ | |||
+ | * **Statement #1** : Measurements are done in recording studio environment. Namely, there is no control on CEM/EMI interfering with measurements apart from standard studio installation best practices in terms of proper ED grounding and shielding. | ||
+ | * As a consequence, | ||
+ | * **Statement #2** : One input and one output are used on each unit, there is only one pair of interface sample tested. Having a pair allows to check for a similar performance on both interface, to rule out obvious erroneous failures on one interface. It is understood that statistically processing those measurement among several interfaces and unit S/Ns would be much better, but is out of scope of this measurement procedure. | ||
+ | * As a consequence, | ||
+ | * **Statement #3** : XR18 has two high impedance instrument inputs which MR18 does not have. For the sake of comparing apples with apples, Input 9/10 and Output 1/2 are used as references on both units. | ||
+ | |||
+ | Measurement Gear | ||
+ | * UUTs | ||
+ | * MR18 S211000533C8H | ||
+ | * XR18 **XXXXXXXXXXXX** | ||
+ | * Tools | ||
+ | * Gen2 Apollo Twin USB | ||
+ | * XLR Wires / Jack Adapters | ||
+ | * Room EQ Wizard Rev xxx for measurement | ||
+ | |||
+ | ------------- | ||
+ | |||
+ | ===== Test Procedure ===== | ||
+ | |||
+ | ==== T1 - Inner Noise and THD ==== | ||
Measure loopback | Measure loopback | ||
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=== Setup === | === Setup === | ||
- | REW in loopback mode, diragram: | + | * REW in loopback mode, |
+ | * Double shielded XLR as connection | ||
+ | * on both units, use In-9 and Out-1 | ||
+ | |||
+ | Loopback | ||
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- | === XR18 Measurement === | + | === *R18 Measurement === |
== -12dBfs / G=0 == | == -12dBfs / G=0 == | ||
+ | * Set Inputs Gain to 0dB | ||
+ | * Set Output level to match a -12dBfs input level | ||
+ | * Measure RTA and store | ||
- | == -20dBfs | + | == -12dBfs / G=8dB == |
+ | * Set Inputs Gain to 8dB | ||
+ | * Set Output level to match a -12dBfs input level | ||
+ | * Measure RTA and store | ||
+ | |||
+ | == -12dBfs / G=18dB == | ||
+ | * Set Inputs Gain to 18dB | ||
+ | * Set Output level to match a -12dBfs input level | ||
+ | * Measure RTA and store | ||
+ | |||
+ | == -12dBfs / G=28dB == | ||
+ | * Set Inputs Gain to 28dB | ||
+ | * Set Output level to match a -12dBfs input level | ||
+ | * Measure RTA and store | ||
+ | |||
+ | ------------- | ||
+ | |||
+ | ==== T2 - External loop comparison ==== | ||
+ | |||
+ | === Setup === | ||
+ | |||
+ | {{drawio> | ||
+ | |||
+ | === *R18 Procedure === | ||
+ | |||
+ | == -12dBfs | ||
+ | * Set Inputs Gain to 0dB | ||
+ | * Set Output level to match a -12dBfs input level | ||
+ | * Measure Transfer function and store | ||
== -12dBfs / G=8dB == | == -12dBfs / G=8dB == | ||
+ | * Set Inputs Gain to 8dB | ||
+ | * Set Output level to match a -12dBfs input level | ||
+ | * Measure Transfer function and store | ||
- | == -30dBfs | + | == -12dBfs |
+ | * Set Inputs Gain to 18dB | ||
+ | * Set Output level to match a -12dBfs input level | ||
+ | * Measure Transfer function and store | ||
- | === MR18 Measurement | + | == -12dBfs / G=28dB == |
+ | * Set Inputs Gain to 28dB | ||
+ | * Set Output level to match a -12dBfs input level | ||
+ | * Measure Transfer function and store | ||
+ | |||
+ | ===== Test results ===== | ||
+ | |||
+ | ==== T1 - Inner noise and THD ==== | ||
+ | |||
+ | === XR18 Results | ||
== -12dBfs / G=0 == | == -12dBfs / G=0 == | ||
- | == -20dBfs | + | == -12dBfs / G=8dB == |
+ | |||
+ | == -12dBfs / G=18dB == | ||
+ | |||
+ | == -12dBfs / G=28dB == | ||
+ | |||
+ | === MR18 Results === | ||
+ | |||
+ | == -12dBfs | ||
== -12dBfs / G=8dB == | == -12dBfs / G=8dB == | ||
- | == -30dBfs | + | == -12dBfs |
- | ==== T2 - External loop comparison | + | == -12dBfs / G=28dB == |
+ | |||
+ | ==== T2 - Transfer function | ||
+ | |||
+ | === XR18 Results === | ||
+ | |||
+ | == -12dBfs / G=0 == | ||
+ | |||
+ | == -12dBfs / G=8dB == | ||
+ | |||
+ | == -12dBfs / G=18dB == | ||
+ | |||
+ | == -12dBfs / G=28dB == | ||
+ | |||
+ | === MR18 Results === | ||
+ | |||
+ | == -12dBfs / G=0 == | ||
+ | |||
+ | == -12dBfs / G=8dB == | ||
+ | |||
+ | == -12dBfs / G=18dB == | ||
+ | |||
+ | == -12dBfs / G=28dB | ||
- | === Setup === | ||
- | {{drawio> |
xrvsmr.1718618353.txt.gz · Last modified: 2024/06/17 09:59 by wadmin