Hx350
IRFP240/9240 Vertical Mosfets
Direct Drive technology

The Hx350 Kit is a single channel amplifier consisting of a PCB and the associated components to populate the pcb as shown above. Included are 10 Power Mosfets for the Power Section.

The following items are not supplied but are essential to building this amplifier.

1) Power Transformer
    1 pc of 65-0-65VAC (800VA)

2) Filter Capacitors
    4 pcs of 22,000uF/100V

3) Heatsink for the Mosfets

4) Metal Case

 

The Hx350 is the epitome of power. With 10 pieces of IRFP240/9240 power mosfets, it is capable of delivering an astounding 600Watts/RMS into 4 Ω (before clip).

But the Hx350 is not simply raw power, its about the quality of Watts. It has none of the edginess and harshness that amplifiers of this power outputs are notorious for. This is reflected in a Typical Total Harmonic Distortion of less than 0.003 %

Listed below are the general specifications and actual oscilloscope photographs of waveforms rarely published in amplifier manuals, let alone in Kits. It is evident from the data that the Hx350 is in a class of its own.

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This amplifier is recommended for experienced constructors only.
The Hx350 requires point to point wiring for the high current section.
Heatsink shown is for illustrative purposes only. It is not included in the Kit.


Hx350 General Specifications

Rated Power Output
(20Hz to 20kHz Continuous Average Sine Wave)
350 watts into 8 ohms
600 watts into 4 ohms

Power Bandwidth
(350 watts into 8 ohms)
20Hz to 40kHz (0dB to -3dB)

Frequency Response
1 watt into 8 ohms
20Hz to 100kHz (0dB to -1.0 dB)
350 watts into 8 ohms
20Hz to 20kHz (Flat)

Input Sensitivity
+3 dBV
(1.4V RMS produces an output of 350 watts into 8 ohms)

Input Impedance
33K ohms, Unbalanced

Rise Time
2.0 microSeconds

Total Harmonic Distortion (THD)

Full Power(350 watts into 8 ohms)
Less than 0.007 % THD @ 1kHz
Less than 0.08 % THD @ 20Hz to 20kHz

Half Power (175 watts into 8 ohms)
Less than 0.003 % THD @ 1kHz
Less than 0.03 % THD @ 20Hz to 20kHz

10 watts into 8 ohms
Less than 0.003 % THD @ 1kHz
Less than 0.01 % THD @ 20Hz to 20kHz

 

RISE TIME
Measured at 2.0 microSeconds
10V peak to peak from 10% to 90%
20kHz Square Wave into 8 ohms
Very clean response, with no overshoot
 

1kHz Sine Wave with Distortion + Noise
Full Power (350 watts) 1kHz Sine Wave Output into 8 ohms
Horizontal trace is the highly magnified Distortion and Noise components of the Hx350

10kHz Sine Current Waveform
Full Power (350 watts) 10kHz Sine Wave Output into 8 ohms
Top trace is the Current Waveform of the N-Channel FETS
Current measurement by a Tektronix P6022 Current Probe

20kHz Sine Wave with Distortion + Noise
20kHz Sine Wave Output into 8 ohms
Horizontal trace is the highly magnified Distortion and Noise components of the Hx350

Typical THD at -3dB (175 watts)
Measured at 0.0029 % THD @ 1kHz Sine Wave into 8 ohms
Measurements taken with a Boonton 1130 Distortion Analyzer
Signal Oscillator is from the HP 339A atop the Boonton

 

Gallery

1,000Watts/RMS
Hx350 Monoblocks

courtesy of
Daniel Wiering
Australia
1,000Watts/RMS
Hx350

courtesy of
Grant Kennewell
Australia


60 Downes Street | Calais | ME 04619 | USA