•
If you forget the source in a dust environment:gently blow the dust from the speakers.
Do not use a nozzle from a compressor. Do not use a vacuum cleaner tube near the
moving diafragm of the speakers, because it can easily damage the source.
•
If you forget the source outside in the rain until it is soaked then let is dry at room
temperature. Do not place it against a heating. Drying will takemultiple days. If the
amount of water was limited and clean, then the source may work well again. Check
this with a microphone near each individual speaker and compare the 3
rd
octave band
or narrow band curves. Place the source on a soft surface with one speaker upwards,
and place the microphone against the center. Run the source at a relatively low level.
Measure spectrum at a fixed amplifier setting with pink or white noise. Repeat this for
all speakers and compare the differences to the allowable spread within the ISO stan-
dard. The spread should be well below the standard. In case of doubtful results, clear
deformation of the moving parts it is best to send the source back for verification.
What to do when one of the two speakers, or the housing, is damaged?
To prevent damage amplification, it is necessary to stop using the source immediately when a
strange sound or loss of power occurs. Never use the source a high output level if you suspect
damage.
In doubt, to verify, place the source on a soft surface with one speaker upwards, and place the
microphone at the magnet. Run the source at a relatively low level. Measure spectrum at a
fixed amplifier setting with pink or white noise. Repeat this for all speakers and compare the
differences to the allowable spread within the ISO standard. The spread should be well below
the standard.
Never continue to use the source if in broken condition. It will aggravate the damage and in-
crease the repair costs significantly, and can cause exclusion from warranty.
When using an external input signal, could I damage the Qohm2 source or the Qam/Qca am-
plifier?
The Qam/Qca amplifier input will withstand any type of normal signal coming from any
measurement device or computer on the headphone outlet. The output of the Qam/Qca
amplifier will just try to follow the input signal up to ss 0.35V.
However if mains power is somehow in contact with the input, or if the power output of the
amplifier, or of another amplifier is in contact with the input BNC, then this will damage the
amplfier.
The Qohm2 sound source will also withstand normal test signal at a reasonable level in combi-
nation with a Qam/Qca amplifier. Some signals could be applied at maximum level of a
Qam/Qca amplifier until the source internal protection activates. But manynormal signals do
not allow a maximum level setting on the amplifier.
For example, not exhaustive, the following signals could lead to damage when applied with
maximum level, before the source internal protection activates:
–
pulsed low frequency random or sine below 500 Hz, over-stroke
–
sine signals below 300 Hz, over-stroke
–
random noise or sine signals above 20000 Hz, local overheating
Over stroke; cone displacements above 8 mm peak-to-peak are audible as a sharp clicking
sound.
When using another type of amplifier, damage is possible if the peak voltage exceeds 70 V
ssph, even with normal test signals like sine, chirps, random.
The user should be careful not to exceed the short term power and prevent overstroke.
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