Skyinbow Duo-Power IIB
Power Series Balanced Active Transducer Systems For Violin and Viola

A Chinrest-mounted Skyinbow Duo-Power IIB Power Series Active Transducer System 

The Skyinbow Duo-Power IIB Power Series Balanced Active Transducer System For Violin and Viola is an easy-to-install, rechargeable pickup system that features an electronically-balanced signal path that runs from from the system's handcrafted Skyinbow piezo transducer to the output of the system's Power Series miniature preamplifier. This balanced signal path has been designed to actively reject noise caused by external electrical interference. The combination of this active noise rejection with our highly-effective "Direct To Ground” system shielding topology means that the Skyinbow Duo-Power IIB delivers a stronger, clearer, and more accurate sound quality than previous generations of Skyinbow  Active Transducer Systems. This superior performance further enhances the microphone-like sonic accuracy and tonal fidelity that Skyinbow Active Transducer Systems are renowned for.

The Skyinbow Duo-Power IIB Power Series Balanced Active Transducer System For Violin and Viola is available either as an Integrated System or as a Split System.

In an Integrated System, the handcrafted Skyinbow transducer is mounted on a custom-made Guarnerius-style chinrest which has the Power Series miniature preamplifier built into it. 

In a Split System, the Power Series miniature preamplifier is built into a guitar pedal format enclosure, and the Skyinbow transducer is avaiable mounted on either a custom-made Guarnerius-style chinrest or in a Carpenter-style clamp jack.

The Balanced Advantage
Performance
The advantage of the Duo-Power IIB’s fully-balanced signal path is that it ensures that the entire system is inherently more resistant to outside interference from electromagnetic and electrical sources than conventional, unbalanced, piezo transducers and preamplifiers. 

In addition, Skyinbow’s new “Direct to Ground” circuit topology ensures that any interference that is induced in the copper screens that protect the transducer and its cable is sent directly to ground, keeping it entirely away from the audio circuitry in the preamplifier’s signal path.

Connecting a Skyinbow Duo-Power IIB directly to the balanced microphone inputs of a mixing console, audio interface, acoustic amplifier etc. extends the balanced signal path all the way from transducer to microphone preamplifier. This extension allows violin and viola players to take full advantage of the system’s enhanced sonic accuracy and tonal fidelity.

When connected via a standard guitar lead to the unbalanced input of an effects pedal, looper, wireless transmitter etc., the Skyinbow Duo-Power IIB's balanced internal signal path and its "Direct To Ground” system shielding continue to reject external electrical interference. As a result, the Duo-Power IIB is capable of delivering a significant increase in performance over competing unbalanced systems. 

Power
When connected to a balanced input, the Skyinbow Duo-Power IIB can be powered either by its onboard rechargeable power source, or by 48V phantom power from the microphone input itself. The system will switch over automatically to using phantom power when available, otherwise it will take power from its onboard rechargeable power source.

When connected to an unbalanced input, the Duo-Power IIB is powered by its onboard rechargeable power source.

Skyinbow Handcrafted Balanced Transducers For Violin and Viola
Skyinbow Handcrafted Transducers for violin and viola are available separately, and can be supplied either built into a Guarnerius violin chinrest, fitted into a Carpenter-style Clamp Jack, or unterminated. This gives violin and viola players the opportunity to use Skyinbow’s renowned handcrafted piezo transducers with their own choice of preamplifiers from other manufacturers. The transducers are wired for balanced or unbalanced operation. 

Skyinbow Power Series Balanced Preamplifiers
Skyinbow Power Series balanced preamplifiers are also available separately, and can be purchased mounted in a chinrest or,alternatively, in either beltpack or guitar pedal formats. All are equipped with 3-conductor 1/4” (6.35mm) jack sockets wired for both balanced and unbalanced operation. This separate availability gives violin and viola players the option to use Skyinbow preamplifiers with piezo transducers from other manufacturers.

All Skyinbow products come with a limited 2-year parts and labour warranty.

How To Purchase
Pure Acoustic Ltd accepts payments (and all major credit and debit cards) via PayPal or via Bank Transfer.
To purchase a Skyinbow Duo-Power IIB Balanced Active Transducer System for violin or viola, a Skyinbow handcrafted violin transducer or a Pure Acoustic Duo-Power preamplifier, please use the relevant Paypal "Buy Now" button below.
Credit & Debit Cards
Paypal also allows you to pay by debit or credit card even if you do not have a Paypal account.
Bank Transfer
If you would prefer to pay via bank transfer, please get in touch with us using the “Contact Us” page on this website and we will send you all the necessary information. 

If you have any questions, or would like to learn more about our products, we'd be delighted to hear from you via our ”Contact Us” page. 

Dealer and Luthier Enquiries Are Welcome.

UK Retail Pricing
Prices include UK VAT, Postage and Packing
Non-UK Customers can access VAT-free prices in our Export Webshop

Skyinbow Duo-Power IIB Balanced Active Transducer Systems For Violin And Viola
A ¼” (6.35mm) TRS jack to XLR Male Cable is required for Balanced and 48V Phantom Power Operation.
A Power Series V2 Recharge Cable and V2 Battery Adapter Cable are Included. 

VIOLIN 
Duo-Power IIB Balanced Integrated System for Violin (Chinrest Mounted) - £ 239.99 
Duo-Power IIB Balanced Split System for Violin (Transducer In Chinrest) - £ 269.99 
Duo-Power IIB Balanced Split System for Violin (Transducer In Clamp Jack) - £ 269.99 

VIOLA
Duo-Power IIB Balanced Integrated System for Viola (Chinrest Mounted) - £ 239.99 
Duo-Power IIB Balanced Split System for Viola (Transducer In Chinrest) - £ 269.99 
Duo-Power IIB Balanced Split System for Viola (Transducer In Clamp Jack) - £ 269.99 

Skyinbow Handcrafted Transducers For Violin and Viola
Handcrafted transducers are supplied wired for both balanced and unbalanced operation. We recommend the use of either a Pure Acoustic or other high quality piezo preamplifier.
Handcrafted Violin/Viola Transducer With Custom Cable Length (Unterminated) - £89.99 

VIOLIN
Chinrest Mounted Handcrafted Transducer for Violin - £119.99 
Clamp Jack Mounted Handcrafted Transducer for Violin - £119.99 

VIOLA
Chinrest Mounted Handcrafted Transducer for Viola - £119.99 
Clamp Jack Mounted Handcrafted Transducer for Viola - £119.99 

Skyinbow Power Series Preamplifiers
Guitar pedal format preamplifiers are fitted with 1/4” (6.35mm) input and output jacks wired for balanced or unbalanced operation. Chinrest mounted preamplifiers are supplied with a length of unterminated cable. We can also fit your own transducer into the chinrest provided that it has a minimum of 16cm of cable attached.
A ¼” (6.35mm) TRS jack to XLR Male Cable is required for Balanced and 48V Phantom Power Operation.
A Power Series V2 Recharge Cable and V2 Battery Adapter Cable are Included.
Duo-Power IIB Piezo Preamplifier for Violin or Viola (Chinrest Mounted) - £149.99 
Duo-Power IIB Piezo Preamplifier (Guitar Pedal Format) - £169.99 

Skyinbow Power Series Accessories
Power Series V2 System Recharge Cable - £14.99 
(Includes V2 Battery Adapter cable)
USB 5V-9V Step-up Converter Cable - £14.99 
(Requires a USB 5V/2A mobile phone charger)
System Recharge Cable For Earlier Non-Power Series Skyinbow Systems - £14.99   

A Skyinbow Handbuilt Transducer Mounted In A Carpenter-Style Clamp Jack

Manuals
Duo-Power IIB Active Transducer System Owner’s Manual
Power Series Active Transducer Systems Installation Manual For Violin & Viola 
Duo-Power IIB-Compatible USB Mobile Phone Chargers, USB Step-Up Converter Cables and 9V Power Supplies

Technical Notes
Skyinbow Handcrafted Balanced Piezo Transducer For Violin and Viola

A handcrafted, balanced piezo transducer is a rare sight. The manufacturing process is labour intensive and time-consuming. However, when you connect that balanced transducer to a piezo preamplifier with a balanced input and output (such as the Power Series DUO-POWER IIB), you will be rewarded with a strong, clear and accurate sound quality and you’ll understand why we go this extra mile.

Installation of the transducer on a violin or viola requires the drilling of a blind hole 3.2mm in diameter and 3.2mm deep at the back of your violin bridge at the top of its bass foot. We recommend that the transducer is installed by an experienced violin repairer or luthier.

Skyinbow Power Series Balanced Piezo Preamplifier

Building on the multi-year design and development collaboration between an international team of designers and engineers that produced its predecessor, this latest Power Series preamplifier not only delivers an improved audio performance compared to all our earlier preamplifiers, but also allows musicians to choose between powering the Duo-Power IIB Power Series Active Transducer Systems from its rechargeable power source or 48V phantom power.

When connected to the balanced microphone input of a mixing console, audio interface etc.via a balanced cable, the Power Series preamplifier can be powered by 48V phantom power and outputs a fully-balanced signal, ensuring maximum signal quality and integrity. 
When the on-board rechargeable power source is providing the power, the Power Series preamplifier also outputs a balanced signal when connected via a balanced cable to a balanced microphone input, and an unbalanced signal when connected via an unbalanced cable to an unbalanced input - for example an acoustic amplifier, wireless radio system, DI box, effects pedal etc.

Onboard Rechargeable Power Source
The Duo-Power IIB's proprietary rechargeable, on-board power source incorporates a unique application of the latest power sensing technology and power management techniques that were first developed within the computer industry.The use of a supercapacitor to store an electrical charge eliminates the need to use conventional (and weighty) alkaline or lithium-ion onboard batteries, which helps to reduce battery waste and environmental damage. This design allows Skyinbow to offer three methods of recharging the System Power Source using the Power Series V2 System Recharge Cable (V2 SRC):

1 - a USB 5V to 9V step-up converter cable (requires a 5V/2A USB mobile phone/tablet charger or power bank), or 
2 - a V2 Battery Clip Adapter Cable (requires a 9V (PP3) battery), which is supplied with the V2 SRC, or 
3 - a 9VDC/1A, centre-positive, 110-240V power supply adapter

Suitable power supplies, USB to DC converters, phone/tablet chargers and power banks are readily available from both online and “bricks and mortar” retailers.

Charging the supercapacitor is simply a matter of connecting one of the above options to the supplied V2 SRC and plugging that cable's output jackplug into the output socket of the Duo-Power IIB Active Transducer System for between one and two minutes for a full charge. A fully-charged capacitor stores enough power to run the System for approximately 8 hours of playing time.

In Case Of Emergency - If a Power Series SRC (V2 or earlier) is not available a Duo-Power IIB pickup system can be recharged simply by plugging a standard guitar cable into the system and holding the positive terminal of 9V PP3 battery against the tip of the free jackplug and the negative terminal against its sleeve for one to two minutes.

48V Phantom Power
The balanced microphone inputs of the vast majority of mixing consoles, audio interfaces, acoustic instrument amplifiers etc which are available these days are capable of supplying 48V phantom power. Originally developed to power condenser microphones, 48V phantom power is now often used as a convenient way of powering preamplifiers.

Direct To Ground Shielding
Skyinbow’s Direct to Ground shielding topology helps prevent noise by ensuring that any externally-induced electrical charge or current in the shielding that encases all Power Series Active Transducer Systems has a direct path to ground that entirely bypasses the systems' audio circuitry. 

Balanced Cables
Balanced cables - such as microphone leads - are made up of two conductors both of which carry identical copies the audio signal, one of which has its polarity reversed with respect to the other. When these two signals reach the preamplifier, the reversed signal has its original polarity restored. 

Any electrical interference picked up in the cable will have the same polarity in both conductors, which means that, when the reversed signal has its original polarity restored, the polarity of the noise in that conductor is reversed in relation to the noise in the other conductor, which cancels out the noise and leaves the original signal intact.

A balanced 1/4” (6.35mm) “stereo" jackplug to male XLR (TRS* to XLR**) cable is required to make a balanced connection between the Duo-Power IIB and a balanced XLR microphone input. This type of cable is readily available from bricks and mortar and on-line music retailers.

Unbalanced Cables
Unbalanced cables - such as standard guitar leads - are made up of a single conductor which carries the audio signal, and a woven or helically-wound copper wire screen. The screen acts as the ground reference for the audio signal and also, as its name implies. “screens" the audio signal from unwanted noises caused by including, for example, electrical and radio interference. However, the screen can also act as an antenna and pick up electrical and radio interference. Mains power cables, for example, are a common source of electrical noise and hum in unbalanced cables. 

In the Duo-Power IIB, the Direct to Ground shielding and the balanced connection between its transducer and its preamplifier combine to reject external electrical interference and help to prevent noise from entering the system’s audio circuitry.

Connecting a the 1/4” (6.35mm) jackplug of a standard jackp;ug to jackplug (TS*** to TS) guitar lead to the Duo-Power IIB’s balanced output unbalances the output signal at the point at which it leaves the system, which allows direct connection to the unbalanced instrument input of a wireless transmitter, effects pedal, looper etc. Although an unbalanced connection is less resistant to external electrical interference than its balanced equivalent, the strength and clarity of the Duo-Power IIB’s ourput signal means that this is unlikely to create a problem when using a good-quality guitar lead.

Footnotes
* Three conductor stereo jackplugs are made up of three sections - Tip, Ring and Sleeve - hence TRS.
** A fun piece of audio trivia is that the initials XLR stand for eXternal Line Return - not many people know that!
*** Two conductor mono jackplugs are made up of two sections - Tip and Sleeve - hence TS.

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Errors and Omissions Excepted. Prices and Specifications May Change Without Notice.