Differences

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--- xrvsmr [2024/06/17 09:59] – wadmin
+++ xrvsmr [2024/06/17 12:11] – [XR18 vs MR18] wadmin
@@ Line 4: / Line 4: @@
 Test procedure for XR18 vs MR18 measurement.
+A couple of disclaimers starting by 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).
+Also:
+  * **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, comparing the results is more important that dealing with the RAW value.
+  * **Statement #2** : One input and one output are used on each unit, there is only one interface sample. Statistically processing those measurement among several units/interface is out of scope of this measurement.
+    * As a consequence, these results are prone to specimen bias.
+  * **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
+-------------
 ==== T1 - Inner Noise ====
@@ Line 11: / Line 24: @@
 === 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 diragram:
 {{drawio>xrmr:t11.png}}
@@ Line 34: / Line 51: @@
 == -30dBfs / G=18dB ==
+-------------
 ==== T2 - External loop comparison ====