For Sale: A very rare Velleman AVM2050 Analogue Sound Level Meter plus microphone with lead used to calibrate a home cinema room as follows:

Calibrating the system
To help you to set up your installation to give the best possible sound with
any particular combination of associated equipment, the 861 Reference
Digital Surround Controller includes a built-in calibration procedure.
This calibration procedure uses test signals to present a series of sounds,
which you use to adjust certain aspects of the system to their optimum
settings.
You should work through the calibration procedure the first time you set
up your surround sound system, and whenever you want to check the
calibration, such as after changing the layout of your room.
Using the calibration procedure
We recommend that you perform the calibration procedure using the
Meridian System Remote and from the listening position.
As you run the calibration procedure the name of each calibration test is
shown on the front panel display, followed by the parameters adjusted in
the test.
If your Digital Surround Controller is fitted with a video card, and you have a
video source connected, the on-screen display also provides additional text
explaining what to do.
Each calibration test uses a test signal designed to give the best results.
Using a Sound Pressure Level meter
Although you can perform the calibration procedure by ear, it is
recommended that you perform the tests using a Sound Pressure Level
meter, available fairly cheaply from Tandy/Radio Shack, or your Meridian
dealer may be able to lend you one.
Set the Sound Pressure Level meter to C weighted, and Slow. Take readings
with the meter at the listening position, pointing vertically. You should
hold the meter with an outstretched arm to minimise reflections from your
body.


£100 or very near offer

Pease pm if interested and I will send images by whatsapp.

Thank you!


DSP8000USE, DSP5200HC, DSP33, DSW1500, 808v5, 861v4, WiiM Pro+, Panasonic 55" Plasma, DMP-BDT700 Blu-ray,
MECOOL MEon1, Russ Andrews Signature Power Block, UltraFuses, SuperFuses, Kimber Signature PS Interfaces.
Prior: DSP7000.2, DSP6000.2, DSP5000.2, DSP5000.2HC, 508.24, 568.2, 596, G98DH & G68D.
Jaguar F-Type; Meridian 770W Surround System