Fredenstein F610 UE-1 Operating Manual

F610

Universal Entzerrer

UE-1

Operating Manual

Fredenstein F610 Universal Entzerrer UE-1

The Fredenstein F610 Universal Entzerrer UE-1 is a digital controlled stereo analog quad band
equalizer and 30 band spectrum analyzer in a double wide 500 series cassette.

For the first time in a 500 series module, we were able to implement a high resolution 3.5” LCD
color display including a capacitive touch controller, thus welcoming the 500 Series to the 21st
century.

The four filters are all identical and each can be tuned from 20 Hz to 20 KHz. The encoder rotary
frequency knob allows access to about 190 different frequencies per filter, while the USB interface
allows for 1 Hz frequency resolution. The maximum filter gain is +/- 16 dB. In case more gain is
needed, additional filters can be set at the same frequency for a ridiculous up to 64 dB boost or cut.
The Q-factor of each filter can be varied from 0.4 to 7.9. The gain can be adjusted from -16 dB to
+16 dB in 0.25 dB steps, clearly fulfilling the demands of modern sophisticated mastering. The
Filter 1 characteristic can be changed from band-pass to low-shelf and Filter 4 to high-shelf.
In addition, a variable 2nd order low-cut filter with a range from 20 Hz to 975 Hz is provided as well
as a “Color” function giving a tube-like sound. The hard bypass allows for quick evaluation of the
eq'ed results.

The 30-band spectrum analyzer features a 60 dB dynamic range with select-able sensitivity from +6
dBu to + 24 dBu in 6 dB steps. The choice to feed either the input or the output signal to the
analyzer adds to the versatility of the F610.
Up to 99 complete settings can be stored in the internal non-volatile memory and a Micro-USB
interface provides complete control from a connected host computer via RS232 over USB.

The F610 UE-1 name is an homage to the classic K&H UE-100. “Entzerrer” is the German
technical term for equalizer.

Installation:
First, please power down your rack or box before inserting the F610 . The power
requirements are maximum +/-16V, +/-400mA. In case you don't use a Fredenstein Bento
6(D)S or Bento 10 (D)S, please make sure your box or rack can support the current. Bento 2 is
not compatible with the F610. Please consult your third party documentation in case of any
doubt. Don't forget to fasten the F610 securely to the rack with 4 rack screws.

The operating temperature of the F610 should stay below 60C / 140F. The temperature can the
displayed through the menu system (see Setup Menu section, page ). In case the temperature
reaches 60C /140F, please try to increase the airflow of your rack. A fan will kick in at 60C / 140F
to prevent overheating.

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Fredenstein F610 Universal Entzerrer UE-1

Front View

The user interface of the F610 UE-1 consists of a 3.5 inch TFT LCD touch screen with a resolution
of 320 by 480 pixels. The touch screen is capacitive for superior precision and responsiveness.
In addition, three rotary encoder for gain, Q-factor, and filter frequencies provide a traditional user
interface for the most important parameters.
The Micro-USB connector is located at the lower right side of the LCD.

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Fredenstein F610 Universal Entzerrer UE-1

Equalizer Screen

After booting, the main equalizer screen is displayed:

In the upper part of the screen, the frequency response of the F610 is plotted. Please note: the
vertical axis automatically re-scales to up to +/- 64 dB. Touching the screen in the graph area
switches to the spectrum analyzer mode (see details in the analyzer section of this manual, page 7).
The horizontal frequency axis is displayed on a logarithmic scale.
Between the graph area and the touch fields, the current status of all four filters is displayed.
For easy differentiation between the filters, they are color-coded. The center or shelving frequencies
are marked with dots and the low-cut filter is marked by a small triangle. Please note that shelving
filter frequencies are defined at -3 dB from the shelving plateau, the low-cut filter cut-off frequency
is at -3 dB from the pass band.

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Fredenstein F610 Universal Entzerrer UE-1

In the lower part of the screen, there are ten touch fields:

LC: First touch to select the low-cut filter, second touch to toggle the low-cut functionality on or
off. If the low-cut filter is enabled, the lower third of the LC touch field is yellow and states the
low-cut frequency. The frequency can then be varied from 20 Hz to 975 Hz by he rightmost knob,
just below the screen, labeled “FREQ” .

F1: First touch to select Filter 1, second touch to toggle the low-shelf functionality on or off.
If the low-shelf filter is enabled, the lower third of the F1 touch field is yellow and states “LoS”
(Low-Shelf). In regular band-pass filter mode, the gain, q-factor and frequency can the varied with
the three knobs below the display, from left to right: Gain, Q-factor, and Frequency. In shelving
mode the Q-factor control is disabled.

F2: Touch to select Filter 2. Filter 2 is always a band-pass filter. When the F2 touch field is lit,
the three control knobs below the display can be used to change the parameters

F3: Touch to select Filter 3. Filter 3 is always a band-pass filter. When the F3 touch field is lit,
the three control knobs below the display can be used to change the parameters

F4: First touch to select Filter 4, second touch to toggle the high-shelf functionality on or off.
If the high-shelf filter is enabled, the lower third of the F4 touch field is yellow and states “HiS”
(High-Shelf). In regular band-pass filter mode, the gain, Q-factor and frequency can the varied with
the three knobs below the display. In shelving mode the Q-factor control is disabled.

L: Touch to select the left channel and enable the two channel mode. In two channel mode
the F610 allows for different parameters in the left and right channels. When the L touch field is lit,
the three control knobs below the display can be used to change the parameters of the selected filter
of the left channel.

R: Touch to select the right channel and enable the two channel mode. In two channel mode
the F610 allows for different parameters in the left and right channels. When the R touch field is lit,
the three control knobs below the display can be used to change the parameters of the selected filter
of the right channel.

ST: Touch to select the Stereo mode. In the Stereo channel mode the parameters of the left and
right channels are identical. When the ST touch field is lit,
the three control knobs below the display can be used to change the parameters of the selected filter
of the Stereo channel. The Stereo channel is a virtual third channel and does not change the
parameters of the L or R channel.

Col: Touch to toggle the “Color” function. When the Col touch field is lit, the color function is
enabled. Color produces a tube like sound, more mellow and smooth without changing the
frequency response by adding harmonics to the spectrum.

On / Off: Toggles the hard bypass functionality. If ON is displayed inside the touch field, the
corresponding channel (L, R, or ST) is activated, if OFF is displayed, the hard bypass mode is
selected. This allows for quick comparisons of the source signal and the eq'ed result.

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Fredenstein F610 Universal Entzerrer UE-1

To improve the ergonomics of the UE-1, gain and Q-factor stepping functions are implemented.
By pushing the gain knob, the gain changes to 0dB and each further push will change the gain by
3 dB, the same is true for the Q-factor knob, the Q-factor will change by a medium value.

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Fredenstein F610 Universal Entzerrer UE-1

Spectrum Analyzer Screen

After touching the graph area in the Equalizer Screen the Analyzer Screen is displayed:

Up to three different curves will be displayed according to the channel and MAX settings.
The green curve represents the left channel, the red curve the right channel, and the blue curve the
maximum levels.

The touch fields below the graph area are:

IP: Selects the input signal(s) to be fed to the analyzer

OP: Selects the output signal(s) to be fed to the analyzer

MAX: toggles the MAX function, which shows the blue curve of the highest value for each

frequency band and, if MAX is on, the RST and DCY touch fields are displayed

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