MODEL 4010 – OPERATION
Connect the stereo input from your turntable to the Stereo Input connectors on the 4010 rear panel
using a suitable length stereo cable. A good quality cable will help to minimize hum and noise
pickup. Connect the Mono output to your sound system or computer sound card input using a stereo
cable. It is better to listen and record in stereo even though both channels are the same.
In general, if you are going to use the External Processor connectors on the rear panel, you will need
a “flat” stereo preamplifier to drive the external processor. We are writing an Application Note with
some specific information on this subject. If the External Processor connectors are not used, make
sure the Enable - Disable front panel switch is set to Disable.
The factory gain setting is 52 dB which should be sufficient for listening and for many sound cards.
If you happen to have a sound card with low sensitivity, the gain can be increased to either 56 or 60
dB by changing the jumpers on the main circuit board. There is a page in this Guide that shows the
gain vs. the jumper setting. This diagram is also on the underside of the top cover.
To turn on the 4010, just flip the POWER ON switch to its up position. The red power-on indicator
will light.
MODE SWITCH
Adjust the mode switch to get the best sounding speech or music. This will often be the “L+R” or
Mono setting or “L-R” for vertical-cut (or hill-and-dale) recordings. But don’t be afraid to
experiment by using just the Left or Right channel or the Blend control.
TURNOVER
The Turnover frequency is part of the equalization setting that de-emphasizes the emphasis that was
used when the recording was made. There is an extensive Table in this Guide that shows many
record brands and suggests a Turnover setting. You can see from the size of this Table that there was
much variation because there was no universal recording standard prior to 1955 when the Recording
Industry Association of America (RIAA) standard was generally adopted by recording
manufacturers. To make matters worse, many recording engineers liked to experiment and didn’t
even follow their “company’s standard.” Hence, the Table is just a suggestion for a starting setting.
Please experiment until you are satisfied with the sound quality – you can’t damage anything.
ROLLOFF
The Rolloff attenuation is the other part of the equalization setting and suggested starting numbers
are also in the Table. Again, please experiment until you are satisfied with the sound quality.
RUMBLE FILTER
The Rumble Filter was originally included in phonograph preamplifiers to minimize low-frequency
“rumble” in the playback turntable. But this filter can also be used as part of the equalization
process. If you are hearing too much bass, you may be able to get a better overall sound balance by
increasing the filter frequency.
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