The HPA-NXVolt One R4 is a high quality Input/VAS dual rail voltage regulator with a difference. The main purpose of the regulator is to provide a clean isolated supply to the Input-VAS stages of the NXL200, R4.5 NXL300 R4 and NXL500 R5 amplifier modules. There by improving the objective and subjective performance of these amplifier modules.

Instead of being a fix voltage regulator it can be adjusted over a 50 volt DC range from +-38 volts to +-90 volts and be able to deliver currents up to 200ma continuously, 1.5 amps peak and adjusted by a pair of 25 turn on board pots.

There is no current folded back protection to hold back this regulator, current overload is provided by a mini SMD on board fuses set behind the input to the active regulator. The NXVolt One R4 also features on board high speed rectifiers and pre-regulator PI filtering before the raw DC enters the main regulator. So this means the NXVolt One R4 is a fully self contained power supply that only requires an 50VA - 80VA mains power transformer to power it.

The performance of this regulator is very good, providing a well regulated output at any voltage setting and with a ripple rejection of around -70dB and a low dropout voltage of 5.0 volts dc. 

The nxVolt One regulator can power two amplifier modules with ease or if you wish for higher isolation between channels power just one amplifier module.

It has a voltage range of +-50v to 110vdc and requires the main filter capacitors and decoupling capacitors to be upgraded to handle the higher supply rail voltages as well as some minor changes to the feedback resistors.

The Volt One can also be ordered as a low voltage adjustable regulator to power pre-amplifiers or active crossover Opamp's. The adjustable voltage range for this version is 9.0VDC to 21.0VDC for both Positive and Negative rails, but the Volt One regulator can be ordered in four different voltage ranges, see below for volt range details.

The R2.5 Version is now released with a new updated PCB layout and improved raw supply filtering!

Other improvements in the Gate protection for the MOSFETs output stage and some small changes done to the PCB layout.

• NXVolt One R4 can be ordered in four different voltage ranges
• Approximate 9.0VDC to 21VDC - 15VDC to 60VDC - 50VDC to 95VDC
• 70dB of ripple rejection
• Low dropout voltage of 5 volts
• Low noise on output =150 micro-volts
• On board Poly-Switch short circuit protection
• Independent voltage rail adjustment via 10 turn pots
• PCB dimensions are 93mm x 90mm