Based on state-variable, constant-Q filters, the T1951 features four fully parametric stereo bands with center frequency, bandwidth and amplitude controls, plus the option to use the low- and high-frequency bands as shelving filters. In addition, you get 12AX7 tubes and our ULTRA-TUBE circuitry, enabling you to selectively add tube warmth to your EQ’d signal.

Product Features:

• 4-band stereo parametric equalizer with hand-selected 12AX7 tubes
• UTC - Ultra Tube Circuitry adds precise dosage of desired tube effect *
• Parallel filter architecture ensures minimal phase shift
• Precision state-variable filters with constant-Q characteristic
• Switchable shelving filter functions remove unwanted frequencies
• Each band can be bypassed and is fully adjustable from notch filter to broadband equalization
• Broad frequency band overlapping allows extreme boost/attenuation
• Relay-controlled hard bypass with auto bypass function in case of power failure
• Servo-balanced inputs and outputs on gold-plated XLR and TRS connectors for highest signal integrity
• Shielded toroidal power transformer for ultra low-noise performance
• High-quality components and exceptionally rugged construction ensure long life
• Conceived and designed by BEHRINGER Germany

The BEHRINGER TUBE ULTRA-Q has four parametric filters organized in 4 different frequency bands. A backlit VU meter shows the input or output level. Each channel comes with a Warmth control and a tube window.

1.)The INPUT control determines the input level applied to the device and can be set within a range from -15 to +15 Db.

2.) When the PEAK LED above the INPUT control lights up, it means that a level of at least 18 dBu is present after the input stage. Adjust the INPUT control so that the PEAK LED lights up only with signal peaks make sure that it never lights up all the time. When the PEAK LED is on, there is still some 5 Db of headroom left.

3.)The IN/OUT switch is used to enable/disable the entire equalizer section in the audio path. The switch uses a relay-controlled hard bypass function. i.e. as long as it is not active or if the unit is switched off, the inputs are directly connected to the outputs. The IN/OUT switch allows for A/B comparisons between processed and unprocessed signals.

4.)The FREQUENCY control selects the filter’s center frequency, which can be freely chosen within the frequency range of the associated band.

5.)The LEVEL control determines the amount of level boost/cut.

6.)The BANDWIDTH control determines the slope or quality of the filter.

7.) With the SHELF/PEAK switch the two outer bands can be switched from parametric (peaking response) EQ to low and high pass (shelving EQ) filters respectively.

8.)The individual IN/OUT switches allow for enabling/disabling specific bands in the audio path. Use this switch to check the influence of the separate filters and to switch unused filters off for maximum signal integrity.

9.)The WARMTH control determines the amount of harmonics the UTC circuit adds to the signal.

10.)The WARMTH meter displays the amount of added harmonics. This controls the amount of harmonics, or tube sound (“WARMTH”), the UTC circuit adds to the signal.

11.)Use the POWER switch to turn the TUBE ULTRA-Q on or off. When switched of the TUBE ULTRA-Q automatically switches to a hard bypass mode, the signal is then led directly to the outputs.

12.)SERIAL NUMBER..Please complete and return the warranty card within 14 days of the date of purchase.

13.)FUSE HOLDER /VOLTAGE SELECTION. Before connecting the T1951, confirm that the voltage display matches your local mains voltage.

14.)AUDIO IN. These are the audio inputs of your TUBE ULTRA-Q .Matching ¼” TRS and XLR connectors are wired in parallel.

15.)AUDIO OUT. These are the audio outputs of your TUBE ULTRA-Q. Matching ¼” TRS and XLR connectors are wired in parallel.

The TUBE ULTRA-Q splits up the audio signal applied at the input and processes it differently for both signal paths.Each of the two tube halves amplifies the original signal and the signal modified in its phase spectrum (twin triode).Additional harmonics are produced by slightly overdriving the tube stage.When the two signals are processed by the UTC circuit,the interference noise found in conventional tube circuits can be largely eliminated and the actual tube effect be added gradually.The more you turn the Warmth control to the right,the more tube sound will be added to the original signal.

Specifications