Manual - Radial Engineering
Contents
1. FEATURES AND FUNCTIONS INPUT jack connects to instruments like guitars and keyboards 15dB PAD reduces the input level by 15dB to prevent overload from high output devices like CD players and active pickups LED INDICATOR lights to confirm phantom power is active and the Pro48 is working THRU jack passes the instrument signal to the on stage amplifier FULL BOTTOM FOOT neoprene foam foot provides electrical isolation and plenty of friction to stay put 14 GAUGE STEEL bookend shell creates a protective zone around the switches and connectors OUTPUT 6009 balanced mic level output pin 2 hot drives long cables for runs to 1000 feet without appreciable loss GROUND LIFT helps to reduce hum and buzz caused by ground loops SWITCHING POWER SUPPLY steps up the current from phantom power to produce 9 volt internal rails With more voltage to work with than typical active Dis the Pro48 exhibits more headroom and dynamic range while lowering noise MILITARY GRADE double sided PCB is bolted to steel standoffs for road tough construction ISOLATED CONNECTORS are 100 electrically isolated from the chassis ACTIVE DRIVE CIRCUIT electronically balances the signal and converts it to low Z mic level I BEAM DESIGN inner steel enclosure is made extremely rigid with an beam profile This eliminates stress that could torque the PC board and cause solder joint failu2. Pro48 This will reduce the input level by 15dB If you encounter any buzz or hum try lifting the ground switch on the Pro48 with the LIFT switch This interrupts the signal ground between the input and output to reduce hum and buzz caused by ground loops Now close your eyes and rediscover the sound of your instrument Radial Engineering Pro48 User Guide FREQUENTLY ASKED QUESTIONS What is the difference between active amp passive Active DI s have a built in pre amp requiring power to run while passive DI s use a transformer to convert the signal Both transform or convert the instrument s high impedance output to a low impedance balanced microphone level This allows long cable runs without adding unwanted noise Passive boxes have the advantage of providing isolation over typical Dis which can reduce ground hum and noise in systems The Pro48 features an isolation transformer in the power supply to address this problem Which is better active or passive Both have their place just like dynamic and condenser microphones Passive Dis are often easier to use because they do not require power while active Dis tend to have more reach As a rule passive direct boxes are best suited for electrically powered devices like keyboards while active boxes are often preferred for instruments like acoustic guitars and basses What makes the Radial Pro48 so special Let s begin by understanding how active DI s work active direct b
3. ed under this limited warranty This limited warranty shall not apply if the product has been damaged due to abuse misuse misapplication accident or as a result of service or modification by any other than an authorized repair centre THERE ARE NO EXPRESSED WARRANTIES OTHER THAN THOSE ON THE FACE HEREOF AND DESCRIBED ABOVE NO WARRANTIES WHETHER EXPRESSED OR IMPLIED INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE SHALL EXTEND BEYOND THE RESPECTIVE WARRANTY PERIOD DESCRIBED ABOVE OF THREE YEARS RADIAL ENGINEERING SHALL NOT BE RESPONSIBLE OR LIABLE FOR ANY SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSS ARISING FROM THE USE OF THIS PRODUCT THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS AND YOU MAY ALSO HAVE OTHER RIGHTS WHICH MAY VARY DEPENDING ON WHERE YOU LIVE Pro48 User Guide cRadial engineering Pro48 Active Direct Box Users Guide Radial Engineering 1638 Kebet Way Port Coquitlam BC V3C 5W9 Tel 604 942 1001 Fax 604 942 1010 email info radialeng com Radial Engineering is a division of CeTEC JP CableTek Electronics Ltd Radial Pro48 users guide v1 0 Part R870 1135 00 Subject to change without notice CONGRATULATIONS on your purchase of the Radial Pro48 active direct box As with all Radial products the Pro48 is easy to use This short manual contains all the information you need to start using the Pro48 right away For more informatio
4. he switching PSU steps up the current from phantom power and the drive circuit uses the higher rail voltage to increase headroom and dynamic range The switching PSU uses a transformer in the DC path to block noise caused by ground loops The ground LIFT switch interrupts the ground path around the transformer to help suppress noise from bleeding through into the audio path Radial Engineering Pro48 User Guide CONNECTING THE Pro48 Before connecting the Pro48 start by making sure all volume levels are set to zero This will avoid any loud pops in your sound system that could cause driver damage Confirm the Pro48 switches are in their out position Begin by connecting your instrument to the 74 INPUT jack on the Pro48 The instrument signal may be connected through the Pro48 to an amplifier using the THRU jack Finally connect the LOW Z OUT to the input of a microphone snake or mixing console using a balanced XLR cable The Pro48 can drive very long cable in excess of 300 feet without signal loss f USING THE Pro48 Once your cables are connected turn on the phantom power source The LED on the Pro48 will light to confirm phantom power is present and the Pro48 is active Start at a low volume to make sure everything is working properly be fore increasing the level If you encounter distortion check the input level at your mixer first If your mixer controls appear normal try depressing the input PAD switch on the
5. n on the Pro48 and other Radial products visit our website at www radialeng com OVERVIEW The Pro48 is a great sounding active direct box It has been optimized to produce maximum headroom and dynamics while working within the limited current available from 48V phantom power The Pro48 employs a unique switching power supply that steps up the current from phantom power to produce higher internal rail voltage than typical active Dis This makes the Pro48 capable of peak input transients to 9 volts without any noticeable distortion making it perfect for both active and passive instruments The Pro48 is equipped with an input PAD to help prevent overload from hot signals and a ground lift to reduce noise caused by ground loops The balanced XLR output can drive very long cables without appreciable signal loss The Pro48 is constructed for heavy use in the studio and on stage Pro48 BLOCK DIAGRAM To fully understand the Pro48 follow the block diagram from the inputs on the left to the outputs on the right anaes ACTIVE INPUT BALANCED DRIVER PSU After the paralleled input and thru jacks the signal passes through a switchable 15dB PAD which allows the Pro48 to handle virtually any audio device from passive pickups to CD players without overloading GND LIFT Next comes the active drive circuit that converts the signal to balanced low impedance mic level for transmission over long cables without noise or signal loss T
6. oxes are in fact preamplifiers They boost the instrument s signal to a manageable level This means that active direct boxes require power to run As such they must either get their power from batteries or phantom power from the console When using batteries they must be fresh for the direct box to work properly As soon as the power is low the direct box will distort This is why engineers hate batteries and prefer phantom power But phantom has limitations phantom power was originally developed to supply low current condenser microphones The AES specification for phantom is 48 volts with only a few milliamps of current We tested a popular acoustic guitar with built in pre amp and found that when pushed to the max the output peaked at 7 volts Considering that most DI s can barely manage 3 volts its no wonder guitars often sound harsh in a PA system The Radial Pro48 was specifically designed to solve this problem by increasing the internal rail voltage so that these high output instruments would not overload the DI s input How does Radial increase the rail voltage We take the phantom power voltage and drive it through a special custom made DC to DC transformer The transformer is coupled to a timing chip that essentially drives the signal the same way as the newer switch mode or digital power amplifiers work This brings the current up to a workable level and creates a higher internal rail voltage to handle the dynamics What is
7. phantom power Phantom power is a 48 volt DC supply that comes from the mixing console that was originally designed to provide power to condenser microphones The Radial Pro48 takes the phantom power and converts it using an internal switching power supply This allows the Pro48 to handle higher transients without the distortion associated with most active direct boxes Radial Engineering Pro48 User Guide
8. re Radial Engineering Pro48 User Guide Radial Engineering Radial engineering Pro48 SPECIFICATIONS Frequency response 20Hz to 40kHz Linear performance 0 12dB 20Hz to 20kHz Total harmonic distortion 0 01 from 20Hz to 20kHz Input impedance 220K ohms Balanced outputs 600 ohms mic level pin 2 hot PAD 15dB Power 48V Phantom RADIAL LIMITED THREE YEAR TRANSFERABLE WARRANTY Radial Engineering a division of JP Cabletek Electronics Ltd warrants this product to be free from defects in material and workmanship and will remedy any such defects free of charge according to the terms of this warranty Radial Engineering will repair or replace at its option any defective component s of this product excluding the finish the footswitch footswitch is warranted for 90 days and wear and tear from normal use for a period of three 3 years from the original date of purchase In the event that a particular product is no longer available Radial Engineering reserves the right to replace the product with a similar product of equal or greater value To make a request or claim under this limited warranty the product must be returned prepaid in the original shipping container or equivalent to Radial Engineering or to an authorized repair centre and you must assume the risk of loss or damage A copy of the original invoice showing date of purchase and the dealer name must accompany any request for work to be perform
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