The Power Rox Power Attenuator (Model: PRX150-Pro2)
The PRX150-Pro2 is a power attenuator designed to be used with tube amplifiers and it allows guitarist to achieve the much desired "fully cranked up" tone from their tube amp, but at more practical volume levels. Utilizing its unique and innovative "Speaker Reactance Thru" (SRT) technology, the PRX150-Pro2 allows the speaker to fully maintain its natural reactance. As a result, the PRX150-Pro2 allows the amplifier's original, "cranked up" tone to be maintained at reduced volume levels.
The PRX150-Pro2 can be a valuable tool for any guitarist. During practice time, when recording, or when rehearsing with the band; you can enjoy the cranked-up power tube tone of your amplifier "the way it was meant to be heard", but at lower volume levels, while pleasing your ears and at the same time not upsetting the neighbors. When playing live you can turn up your tube amp until the cherished power driven tone is reached, then "click" down a notch or two via the Power Rox Attenuator to please your sound man. Everyone will be happy with your tone, most importantly your audience.
* Proprietary SRT Power Attenuation Technology (Patent Pending)
* Six levels of step attenuation, plus a continuously variable attenuation control (bedroom mode)
* 40dB of Attenuation
Attenuates 150 watts down to .015 watt
* 150 watt power rating
* Impedance Matching Technology (Patent Pending)
Independent input and output impedance selector switches:
- from the amplifier and into the attenuator, select from: 4, 8, 16 ohm
- from the attenuator and to the speaker cabinet(s), select from: 4, 8, 16 ohm
Uniquely allows 9 possible Input and Output (Amplifier to Speaker Cabinet)
* Line Out "Equalized" with Level Control
* Load Mode setting, for speakerless operation
* Rack Mount Option
* Handwired in the USA
PRX150-Pro2 - Details:
The PRX150-Pro2 is a "boutique" product that is handcrafted in the USA. Each PRX150-Pro2 power attenuator is carefully, handwired, one at time by craftsmen that are concerned more about quality rather than quantity. The PRX150-Pro2 utilizes high end components, including those that are customized specifically for the Power Rox's advanced attenuation technology. The PRX150-Pro2 is designed to be "Road Ready" with its heavy duty, ventilated, aluminum enclosure.
The key to the PRX150-Pro2's natural sounding attenuated tone, lies within its patent pending SRT technology. Unlike the competition which alters, significantly reduces or completely isolates the speaker's reactance, the PRX150-Pro2's step attenuation has NO impact on the speaker's reactance, allowing the speaker to respond naturally to the tube amplifier's complex signal.
Utilizing the proprietary SRT technology, the speaker is not loaded down and it is allowed to "breath" normally. Therefore, the speaker can react to the harmonically rich signal generated by the tube amplifier. In doing so, the speaker and tube amplifier are able to naturally interact. This adds up to a highly transparent, "cranked up" attenuated tone, that is natural sounding and full of dynamics.
Since the SRT technology allows your speaker's reactance to remain intact, the PRX150-Pro2 does not utilize an artificial reactive circuit or speaker emulation circuit. After all, what could be more natural than using your speaker's unaltered reactance to develop the tone from your tube amplifier?
Also, the PRX150-Pro2 does not utilize any EQ circuit. The SRT technology attenuates the amplified signal in a very linear fashion across the entire frequency spectrum. The PRX150-Pro2 is also a wideband device, allowing the full audio spectrum produced by the tube amplifier to pass through it. The tone you hear is not altered or "tweaked" by an internal EQ. What you hear is purely the tone generated by your tube amplifier, passing through the attenuator, to the non-loaded speaker. The tone you hear will be very natural sounding with the dynamics preserved. You will notice that the full bandwidth of the signal is maintained, with bottom end, mids and highs fully intact.
The SRT technology also allows for a smooth transition from the Step Attenuation mode to the Continuous Variable Attenuation mode. The tone and dynamics remains consistent throughout the entire attenuation range. You do not get the dulling effect or detect any unpleasantness in the tone, when switching from one step to another or from the step mode to the variable mode, as you do with most other attenuators.
Also, the PRX150-Pro2 does not utilize an inexpensive variable L-Pad for the variable attenuation mode as some of our competitors do. Our Variable Mode allows for very fine adjustment of the "bedroom" volume level, across the entire rotation of the Variable Attenuation knob. Unlike those attenuators using an L-Pad, which provides a course adjustment at "bedroom" volume levels, making small incremental changes in volume more difficult.
The Continuously Variable control covers two ranges of attenuation, via the front panel toggle switch.
With the switch in the Minimum Variable Attenuation mode, the variable control provides between 16 to 27dB of attenuation.
With the switch in the Maximum Variable Attenuation mode, the variable control provides between 27 to 40dB of attenuation. 40 dB of attenuation reduces 150 watts down to .015 of a watt, providing enough attenuation for late night playing with a fully cranked up 100 watt amp.
Guitarists will also find the PRX150-Pro2 very useful in getting more power tube involvement in their cleaner tones, which can add depth to their slightly broken up cleans and a greater purity to their lightly overdriven tones, while still maintaining the desired volume. Therefore, blues and jazz guitarist will also find the PRX150-Pro2 a very useful tool.
The PRX150-Pro2 is engineered to take the power and the heat. With its continuous 150 watt power rating, the PRX150-Pro2 is designed to handle the brute power of most fully cranked 100 watt "quad" tube amplifiers, whose output power are often well over 100 watts.
Exclusive to the PRX150-Pro2, are the individual input and output impedance selector switches. The user can set the attenuator's input impedance to match the amplifier's impedance and separately set the attenuator's output impedance match the speaker's impedance. This allows proper matching of mis-matched amplifier to speaker impedances.
For example; suppose you have an amplifier with a fixed 4 ohm impedance and you want the attenuated power to drive a 16 ohm speaker cabinet. With other attenuators this is typically not an option, however the PRX150-Pro2 is specifically designed for this purpose. You simply set the attenuator's input impedance to 4 ohm and separately set the output impedance to 16 ohm. The SRT technology allows dissimilar impedances to be properly matched, providing the correct load impedance to the tube amplifier. Unlike other attenuators that force you to match the input and output impedances, the PRX150-Pro2 has the ability to "mix" and "match" the amplifier and speaker impedances. This allows 16 possible Input and Output impedance combinations, while other attenuator products offers only a single or at the most 3 impedance combinations. With the PRX150-Pro2, as you add or change amplifiers and speaker cabinets to your collection, you no longer have worry about buying another attenuator to match the impedance of your new gear. Therefore, the PRX150-Pro2 will be compatible with your entire current and future collection of tube amplifiers and speaker cabinets.
The PRX150-Pro2 also features a Load Mode and Line Out with Level Control. The Line Out Signal is equalized to emulate the natural high frequency roll off of a guitar speaker. The Line Out allows you to send the amplifier's signal to sound system, recording system, rack mount effects, slave into another guitar amplifier or an external power amplifier (Wet/Dry Configuration). In the Load Mode the Line Out can be used with or without the guitar speaker attached. The Line Out feature is always active, therefore the Line Out can be used even when the attenuator is in the Bypass mode. This can be useful when you require the Line Out feature, but do not require any attenuation. Available separately is a Line Out 1/4" to XLR Line Matching (Impedance) Converter. For more details see the Pricing/Accessory section on this page (below).
The BYPASS-ATTENUATE Switch allows the user to bypass the attenuator without having to disconnect the speaker cables. The Line Out Feature is "always on", allowing the Line Out to be used, even when the attenuator is in the Bypass mode.
Features and Specifications:
- 40dB of overall attenuation
* Attenuates 150 watts down to .015 watt
- Rotary Switch provides (6) Step Attenuation Levels
*Approximately 3dB per step (step positions A-E), with an additional 1dB of attenuation
when position "F" is selected, for a total of 16dB of attenuation within the step mode.
16dB cut in power translates into the speaker receiving less than 3% of the amplifier's power.
- The Dual Mode Variable Attenuation control provides two attenuation ranges, which allows
continuous variable control of "bedroom" level adjustment
* Minimum Variable Attenuation mode = 16 to 27dB of attenuation
* Maximum Variable Attenuation mode = 27 to 40dB of attenuation
- Independent Input Impedance Switch: 4, 8, 16 ohm
- Independent Output Impedance Switch: 4, 8, 16 ohm
* Uniquely allows dissimilar amplifier and speaker impedances to be used.
- Attenuator Bypass Switch (True Bypass)
- Load Mode
- Line Out "Equalized" with Level Control
(unbalanced, 1/4" phone jack, approximately 30k ohm -mid range)
- 2 Speaker Jacks (wired in parallel)
- Passive design, does not require AC power
- Rugged, black powder coated aluminum housing,
with Rear Metal Bumpers to protect the back panel switches/knobs
- Heavy duty, steel reinforced handle
- 19" Rack Mount Option
- Handwired (Point-to-Point wiring) and Handcrafted in the USA
* Each PRX150-Pro2 attenuator is constructed and tested "in house" at ARACOM Amplifiers.
Weights and Dimensions:
- Weight: 17 lbs (7.7kg)
- Dimensions: 11"w x 6.0"h x 8"d (27.9cm x 15.2cm x 20.3cm)
6.5" (16.5cm) tall including feet
Starting with the Ultimate Speaker Demo, an ever-increasing number of the GearTunes audio clips are being tracked using the Radial JCR Reamp. The Reamp was invented by my good friend and colleague John Cuniberti who engineered/co-produced many of Joe Satriani's most infamous recordings.
For GearTunes, reamping allows me to record a track where the guitar "hears" the amp in the room, but initially only the guitar or guitar and effects signal is recorded. This allows me to spend additional time perfecting amp tones and mic placement once I have the performance I'm looking for. One of the byproducts of this process is the creation of GearTunes DI Clips which enable you to play select guitars and effects through your amp by using your mobile device or computer as a reamp device.
For GearTunes DI Clips - and Gear Tune DI Clips ONLY (always found under the DI clips tab for gear that has one), you can play our guitar and effects through your amp. Simply use an unbalanced cable that terminates with an 1/8th inch jack on one end and a 1/4 inch jack on the other. Connect the 1/8th jack to the output of your mobile device or computer and the 1/4 inch jack into the front of your amp. Start off with your amp volume at zero and your mobile device (or computer) volume all the way up to ensure you hit the front end of the amp with enough signal, and then gradually increase the volume of the clean channel on your amp until you reach a level that is not capable of causing damage to your ears or equipment. GearTunes accepts no liability for the use, abuse or misuse of these clips, and playing them into your amp is done exclusively at your own risk.
I am tremendously excited about being able to share GearTunes DI Clips with you as you journey on your quest to find right gear for the music you play! Cheers ~ Doug:)
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