User manual ART TUBE MP-PROJECT WITH USB

[. . . ] Project Series TUBE MP User's Manual IMPORTANT SAFETY INSTRUCTION ­ READ FIRST This symbol, whenever it appears, alerts you to the presence of uninsulated dangerous voltage inside the enclosure-voltage that may be sufficient to constitute a risk of shock. This symbol, wherever it appears, alerts you to important operating and maintenance instructions in the accompanying literature. Please read the manual. Read instructions: Retain these safety and operating instructions for future reference. Heed all warnings printed here and on the equipment. Follow the operating instructions printed in this user manual. [. . . ] Input impedance is 4. 7k Ohms in the high position. This position should be used for most microphones and line level signals to minimize any loading effects on the source. The low position sets the input impedance to 600 Ohms. This position terminates the signal with known low impedance that can flatten and clean up the frequency response of some vintage equipment including ribbon microphones, and various transformer coupled outputs. By controlling impedance at the input you reduce the need for added equalization and the response to percussive audio dynamics is tightened in many cases. The Filter Switch rolls off the response to signals lower than 40Hz. This helps to cut out low frequency rumble, wind noise, and all types of very low frequency energy before it is amplified. When directly plugging into an instrument amp or microphone input on another piece of equipment you may find that a 9 o'clock position gives you plenty of output. The LED metering circuitry covers a wide 30dB range and has a fast attack to help indicate any clipping. It is located in the signal chain just after the tube. The Output control comes after the meter so that you can use the meter to set the overall input gain for best dynamic range then trim the output signal level to the system you are driving. The red "Clip" LED comes on just before clipping and should light on extreme musical peaks only. The yellow "0dB" LED is set to 15dB below the "Clip" LED. If the "0dB" LED is on half the time then you have about 15dB of headroom on the average. The green "-7" and "-15" LEDs indicate how far below the nominal "0dB" LED your signal is. These LEDs should be on much of the time during performance and if not it indicates that your signal or input gain is too low for best results. The FET limiter has its output level set to be at the "0dB" LED point so if the limiter is engaged and the "0dB" LED is on then you are in limiting. This helps in setting output level for your system. To do this you would start with the limiter off, apply a signal and increase the gain until the red "Clip" LED comes on occasionally, then engage the limiter. At this point the signal at the tubes output will be in limiting much of the time. You can then adjust the Output control so you are just below clipping at your A/D, computer, recorder, or amplifier input. For the built in USB interface this setting would be around 2 o'clock. [. . . ] Exclusions This warranty does not apply in the event of misuse or abuse of the product or as a result of unauthorized alterations or repairs. This warranty is void if the serial number is altered, defaced, or removed. A R T reserves the right to make changes in design or make additions to or improvements upon this product without any obligation to install the same on products previously manufactured. A R T shall not be liable for any consequential damages, including without limitation damages resulting from loss of use. [. . . ]