master the art of timing

How to install your DEQX HDP–4

The DEQX HDP-4 combines DEQX’s revolutionary speaker and room calibration with utterly transparent analog-to-digital and digital-to-analog conversions with fully seven analog and digital input options. The HDP-4 features remote volume and the 3-band DEQX Forensic Tone Controls in addition to 99 memory positions for recordings or record labels. The HDP-4 also allows you to add one or a pair of subwoofers to a stereo system.

If you have a surround preamp you can use the HDP-4 to calibrate front left and right speakers and one or a pair of subwoofers while taking advantage of the HDP-4’s exceptional stereo preamp and DAC for stereo sources.





There are two levels of installation options…


1) Room and Preference EQ

You can use the HDP-4’s remote control 3-band parametric EQ right out of the box to eliminate the main room resonance and tweak tonal preferences by ear without even connecting to a computer. But to use the full power features of the DEQX HDP-4 you’ll need to connect it to a PC notebook or Mac running Windows via the supplied USB cable to allow preference tweaking in the listening area.

DEQX’s minimum-phase multiband parametric EQ gives you the power to adjust the frequency bands that are causing problems in your listening area. Room measurements are graphically displayed in the DEQX Cal™ software making it easy to eliminate the problem with several bands of parametric equalisation. Four preference profiles can be recalled using the remote.

The DEQX Cal software’s Measure Room Wizard makes the process straightforward or you can forget about reading manuals and use our DEQXpert™ online installation service. In that case you just connect the unit and set up the measurement microphone as directed and we’ll give you one-on-one training so you can tweak preference adjustments in the future on your own.


2) Speaker Calibration

For ultimate results the HDP-4 takes anechoic measurements of your speakers which provides the highly detailed phase and frequency response details needed to calibrate the speaker itself prior to room measurement. An anechoic measurement (without room reflection echo) is the same type of measurement most speaker designers use to check accuracy. With the exception of measuring planar, dipolar and omnidirectional speakers, room reflections are usually kept out of DEQX speaker measurements achieving the highest levels of phase/timing detail possible.

After setting up the speaker measurement as described in the manual or by the DEQXpert online installer, three Wizards in the DEQX Cal software run the anechoic measurements, the Measure Speaker Wizard creates a calibration template with the Calibrate Wizard, and finally configures the system with the Configuration Wizard where, among other things, you can add one or two subwoofers.

Speaker measurements require appropriate positioning of the speaker and microphone combined with DEQX Cal software to eliminates the first and subsequent reflected sound received by the microphone. The goal is maximizing the time between direct sound arrival at the microphone and the first reflection sound from the room and most especially the floor.

Every measurement space is different so if possible it’s best to temporarily move speakers away from side or back walls but if that’s not practical there are other ways to remedy the situation. The measurements’ phase and amplitude data is used in creating the calibration template so accuracy is important. Our online DEQXpert installation service or your local dealer/installer make use of a variety of measurement techniques and software adjustments to overcome difficult measurement environments.