The HULGICHAUDIO top loudspeaker models Duke, Ella MkII and Nina models use a“Low Diffraction Baffle” design technology for an optimized frequency response. The LDB Technology ensures a smooth frequency response, not only on-axis, but also off-axis over a wide area as well as both horizontally and vertically.

The LDBT Technology helps improving the imaging and gives a larger soundstage compared to a more conventional flat baffle shaped loudspeaker enclosure.

With LDBT technology the loudspeaker enclosure simply disappears and you are enveloped in a generous enjoyable soundstage and a non-fatiguing sound experience.

All HULGICHAUDIO loudspeakers are developed according to the “Coherent Sound Technology” principles.  This ensures a coherent sounding loudspeaker where all drivers simply naturally melt together as one source point of sound.

The CST includes the following 3 features:

1_DTA (Driver Time Alignment)

The loudspeaker drivers, e.g. a mid-woofer and tweeter radiates from different points, both vertically and in depth. This relative driver acoustical center off-set needs to be corrected for in the cross-over design and sometimes in the enclosure design as well, by e.g. tilting the loudspeaker baffle backwards a few degrees.

This ensures that the drivers are time aligned when the sound reaches your ears at the listening positions. Typically, the listening distance is a minimum of 2.5 meters for smaller loudspeakers and 3 meters for larger loudspeakers in order to melt the drivers together as one source point of sound.

2_DPA (Driver Phase Alignment)

In order to make a coherent sounding loudspeaker the loudspeaker drivers relative phase tracking must be as  close to zero as possible, not only at the cross-over frequency, but also at least 2-3 octaves below and above the cross-over frequency.

Top image shows an example of a typical competitor’s loudspeaker relative individual driver phase response.
The bottom image shows the phase integration between drivers of our loudspeakers using the DPA design principles.

3_WDT (Wide Dispersion Technology)

HULGICHAUDIO loudspeakers use a “Wide Dispersion Technology”, where the drivers cross-over frequencies are carefully chosen to optimize each loudspeaker driver’s dispersion characteristics. This means not only to operate in the driver’s comfort zone and working range regarding e.g. distortion and cone break-ups in the passband, but also to use the driver within its dispersion limitations in order to avoid “beaming” issues.

 A mid-range, mid-woofer or woofer starts “beaming” at a frequency having a wavelength equal to the diameter of the radiating cone. This means roughly 3300Hz for a 5” driver, 2800Hz for a 6” driver and 2000Hz for an 8” driver, but that’s only considering the on-axis frequency response.

In reality, beaming starts earlier at the off-axis frequency responses and the loudspeaker cross-over point has to be chosen lower than the above frequency examples in order to avoid off-axis beaming and to avoid frequency response suck outs at higher off-axis angles.

The WDT ensures a smooth off-axis response behavior without suck outs over wide angle between 0-60 degrees and with an even acoustic power response.

By using the CST (Coherent Sound Technology) and its technology features HULGICHAUDIO speakers has a very refined sound with a pin point imaging and a large soundstage including depth, width and height. The sweet spot is very large and the soundstage never collapses, regardless if you are sitting down, standing up or moving around in the room.

For those who prefer using tube amplifiers, the HULGICHAUDIO loudspeakers can optional be fitted with an “Impedance Correction Circuit”. This ensures a smooth and linear impedance response and gives optimal conditions for tube amplifiers to run the loudspeaker (blue line in the picture below).

The ICCT circuit can be purchased at order or added to an existing loudspeaker at a later time by connecting it to the loudspeaker binding posts.

For other types of amplification technologies like e.g. class A, A/B, D and T, this ICCT circuit isn’t needed, but can be used and it doesn’t change the sound or performance of the loudspeaker.