<span id="product_description" itemprop="description"><h2>Empirical Labs DocDerrEsser - 1 EL-RX and 1 EL-DS installed into EL500 Rack</h2>
<span style="font-size: 16px; font-style: italic;">The EL-Rx DocDerr and EL-DS DerrEsser with Horizontal EL500 Rack combines a multi-purpose tone enhancement module and a multi-function dynamic filtering device; pre-installed in the EL500 rack.</span></span><br /><br /><p>
The DocDerr offers six different sections of digitally controlled analog
 processing. A low-noise preamp capable of working with line level or 
instrument level signals is followed by four sections of EQ combining a 
two-position, high-pass filter with three parametric bands, each with 
its own set of carefully tuned frequency presets. By adjusting an 
internal jumper, the DocDerr offers a high quality instrument preamp 
with 16 dB of gain for acoustic guitar, bass, synths, and exotic plucked
 instruments. The dynamics section offers compression and a musical tape
 emulation circuit that softens and tames high frequencies and transient
 spikes. The Mix knob allows the user to blend the uncompressed signal 
with the compressed and saturated signal. The DocDerr is well suited for
 tracking, fine-tuning tracks during mixing, and studio-quality tone 
control.</p><p>
The DerrEsser is an effective, level insensitive de-esser device that 
adjusts the high frequency gain on overly trebly or spiky vocals or 
other sources in an extremely musical manner. However, unlike other 
de-essers, the device allows for multiple use of its circuitry. In the 
DS mode (HF Limit OFF), the threshold can be set to tame harsh sibilance
 that results from an overly bright singer or from EQ'ing to make a 
vocal sound aggressive and clear. The DS threshold is not level 
dependent, and compares the amount of high frequency content to the low 
frequency content, so adjusting the overall level does not affect the 
threshold. It features VCA technology for glitch, distortion, and 
noise-free operation. The corner frequency is user adjustable with a 
high performance active crossover. The HF Limit mode essentially acts as
 a high frequency compressor. If there is enough high-frequency content 
to exceed the threshold, then gain reduction occurs. It is level 
sensitive, but responds much more to high frequencies and functions more
 of a general high-frequency smoothing device.</p><p>The Highpass 
mode uses a LISTEN function, where the user can employ the filter 
circuitry inside the DerrEsser to process their audio. With the LISTEN 
button in, and the HP/LP switch out, the user will be hearing the high 
frequencies controlled by the dynamic/compression circuits. The corner 
frequency is adjustable by the frequency knob. The Lowpass mode also 
uses the LISTEN function, but with the HP/LP button in, the user is now 
listening to the low frequencies, those not affected by the VCA and 
dynamic/compression circuits. This is a 12 dB per octave filter whose 
corner frequency can again be adjusted by the frequency knob.<br />
<br />
The EL500 rack features a quiet power supply and offers both XLR and 
1/4" rear panel inputs and outputs. In addition, a 1/4" instrument 
preamp/direct box input is on the front panel, which will automatically 
switch the left 500 module's input to this front 1/4" jack once 
something is plugged into it. Switches to link compressors and engage a 
48V phantom supply are also provided. The DocDerr DerrEsser ships with a
 guitar adapter cable and a standard IEC power cord.</p>
			
		
		

		

	

	
		

		
		      <div class="sectionHeaders js-hiddenFeatures" data-selenium="sectionHeaders">
				    
				               <dl data-tickertarget="ov-ft-2" class="js-featureSectionDL"><dt class="featureTitle">DocDerr Module </dt><dd class="c28">

										
												<ul><li>Super low-noise line input, or instrument preamp, 
with famous Empirical Labs compression. Six digitally controlled analog 
sections of processing</li><li>Four sections of Equalization: One High Pass and 3 parametric bands</li><li>Empirical
 Labs first compressor in the API 500 format. It is an aggressive 
compressor that follows the EQ, tailored to acoustic instruments, and 
plucked attacks, but good on just about anything. Great for vocals and 
bass</li><li>Complex compressor envelope generator. Fast, yet musically saturates at high gain reduction. Program dependent release</li><li>Saturation
 circuitry that scrunches the highs and allows hotter levels like tape. 
Uses filtering combined with germanium clip circuitry to soften loud 
high frequencies</li><li>Mix control to allow user to blend an 
un-compressed EQ’d signal back in with the compressed saturated signal. 
When on 0, only the EQ’d signal is put out</li><li>Adapter is provided for free, allowing a guitar, bass, etc to be plugged straight into the rear of your API powered rack</li><li>DC coupled input and outputs</li><li>Selectable single-ended or differential output. Differential out adds 6 dB gain</li><li>Traditional and digitally controlled analog combined in new topology</li><li>A
 “BAD!” Hard Clip Indicator LED that lets user know it's within 1 dB of 
hard clipping. It monitors most every section for internal clipping</li><li>High
 Quality Components: All metal film and Roederstein resistors in the 
audio path - top quality components, most being high temperature 
military spec parts</li><li>NOTE: With all the processing, the DocDerr 
draws slightly more current than the API 500 spec, but has worked 
perfectly in all racks tested. Six have been tested in the API Lunchbox 
and other racks, without overloading the power supply</li><li>User modifiable elements, including the Compressor</li><li>Built and calibrated in USA</li></ul>
										  
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				               <dl data-tickertarget="ov-ft-3" class="js-featureSectionDL"><dt class="featureTitle">DerrEsser </dt><dd class="c28">

										
												<ul><li>High performance analog De-esser</li><li>HF Lim 
Mode, as well as standard De-Ess – High Frequency limiting with a 
tailored soft knee. The Dynamic Section can be used for De-essing or 
smooth high frequency softening</li><li>A “BAD!” Hard Clip Indicator LED
 lets user know it's within 1 dB of hard clipping. It monitors several 
sections within the DerrEsser for possible clipping</li><li>Unity Gain in and out – 6 dB of gain available</li><li>Foolproof operation - it's almost impossible to clip or get a bad sound</li><li>Industry standard API 500 Series Rack compatible</li><li>True bypass</li><li>High reliability parts and military grade switches and relays</li><li>Hand built and calibrated in USA</li></ul>
										  
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				               <dl data-tickertarget="ov-ft-4" class="js-featureSectionDL"><dt class="featureTitle">EL500 Rack </dt><dd class="c28">

										
												<ul><li>Unique Flush Mount system for durability & looks</li><li>Super quiet ±16V supplies</li><li>More than 280mA available on both supplies</li><li>48V Phantom supply with 35mA of current</li><li>Link Switch to stereo-link two compressors</li><li>Built in DI “Inst In” (Instrument In) for high impedance inputs built into front panel</li><li>"Inst In" THD is less than .0006%</li><li>A
 performing musician can use the "Inst In" combined with his favorite 
modules, using the high quality preamp on this front panel jack</li><li>Auto-Sense on “Inst In” jack</li><li>XLR & 1/4" Inputs and Outputs. A total of 9 input and output connectors</li><li>Front panel Link-Switch for stereo linking dynamic devices such as compressors/limiters/gates</li><li>Power Consumption: 14W maximum; 9W typical with modules installed</li></ul>
										  
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		      </div><br class="Apple-interchange-newline" /><div><a href="http://rsperackrevolution.com/" target="_blank"><img src="http://www.rspeaudio.com/v/vspfiles/assets/images/rackrevolution-small.png" alt="" align="" border="0px" /></a></div><p>Don’t forget to check out <a href="http://rsperackrevolution.com/" target="_blank" style="color: rgb(0, 0, 153); font-weight: bold;">RSPE’s Rack Revolution</a>,
 a virtual 500-series rack builder that lets you custom-configure the 
perfect 500-series lunchbox for your studio, DAW, or mobile recording 
rig. RSPE carries every 500-series module imaginable, including mic 
preamps, compressor-limiters, equalizers, and 500 power racks.</p><h3>The sound and 
unique features of the Empirical Labs Distressor have made it a staple 
for audio engineers all over the world. For more information, call or 
chat with an RSPE representative today.</h3>