User manual PEAVEY HDH 4 DATASHEET

[. . . ] The Nashville 400 is state-of-the-art with every aspect of design and construction, and we have included our famous DDT@ compression circuitry, which senses the onset of clipping from the power amp and compresses the signal only to the extent necessary to prevent distortion. The active tonecircuitryisverysimilartothat used in ourSession@/LTD@, exceptthatthecontrols havesomewhatgreaterrangeand allow considerably better noise performance. Overall, the new Nashville may be considered the ultimate "Clean Machine" and has been designed to minimize distortion from the input through to the output including the loudspeaker. This system is single channel and features a new pre EQ patch, which allows effects devices to be interfaced before the equalization so that maximum tone coloration may be used to enhance whatever effects devices are chosen. [. . . ] Asetting of zero will renderthe Mid Control ineffective, because the mid-range isat that point totally flat. Most steel guitar equalization settings for the mid-range control will be from minus 3 to minus 9 usually and these settings, of course, will vary from player to player because of technique and outboard equipment used. Patch cords, volume pedals, effectsdevices, guitar pickups, etc. , all tend to have someeffect on overall tonality and forthat reason we are not usually able to give a "cookbook" set of equalization settings for any particular instrument. Experience has proven that mid-range cut is generally more pleasing for most instruments (especially steel guitar and fiddle). SHIFT CONTROL (7) The Shift Control has the ability to move the frequency where the mid-range control has its effect. The "sweep" capability of the shift can position the middle control at any point along thefrequencyspectrum between 150 Hz and 1500 Hz. This is a wider range than was included with the Shift Control in our older model Session@ 400. Please be aware that the Shift Control works in conjunction with the Mid-range Control and any conditioning that is performed by the Mid-range Control may be, once again, altered by the Shift Control. For instance, asetting on the minus (cut) position with the Mid Control will create a dip or a notch in the mid-range response and the shift can relocate this notch anywhere between 150 Hz and 1500 Hz. With this notch preselected with the Mid-range Control you will notice that counterclockwise settings near 150 Hz with the shift will yield thinner sounding mids, while clockwise settings will yield fatter sounding mids. Note also that just the opposite effect is possible when you select a boost with the middle control and rotate the shift from 150 Hz to 1500 Hz. We have determined through much research that the compression circuitry should prevent the poweramplifier/speakercombination from running out of headroom (clipping) and should be as simple to operate as possible to avoid undue complications for the user. Our compression circuitry is very effective. Because of the dynamics and the percussive nature of plucked strings, it is quite common to activate the compression as indicated by the limit LED at reasonably low output levels. One should not be concerned that the limit LED indicates compression virtually constantly during a performance, since this is what it was designed to do. The system was designed to maximize the dynamics available from the amp within its power output capabilities. We have not included other compression controls since we have designed an exclusive distortion detection system which is patented and senses conditions that might cause overload and activates compression only when clipping is imminent. This technique effectively utilizes every precious watt available from the Nashville 400. PILOT LED (12) This light emitting diode (LED) indicates when the amp is switched on and actually drawing from the line (mains) connection. It is totally solid-state and not subject to burnouts, as are incandescent types. POLARITY SWITCH (13) This switch is a three position type with the center, zero position, completely removing the internal grounding capacitor from the circuit. This position is normally recommended for situations where the AC power receptacle is known to contain a properly grounded third wire. If properly grounded AC main supply is not available, a suitable ground adaptor should be used. [. . . ] The product has been damaged by accident or unreasonable use, neglect, improper service or maintenance, or other causes not ansmg out of defects in material or workmanship; or d. The serial number affixed to the product IS altered, defaced or removed. In the event of a defect in material and/or workmanship covered by this limited warranty, Peavey will: a. In the case of tubes or meters, replace the defective component without charge, b. [. . . ]