QRx212 & Itech settings

Re: QRx212 & Itech settings

Matt Vivlamore said:
Does anyone have the QRx212 Bi-Amp settings with the Itech amps?

Or is there a contact at EV that can help me.
Click to expand...

Well, EV won't have settings for the Itechs, but they will have settings for their processors. You may be able to find someone with a processor to measure and copy over to the Itechs, or they may publish a processor transfer function which would make things VERY easy.

If you are measuring the output of an Itech, make sure you have something connected to the output, as the response changes depending on what impedance load is connected.

I can certainly help with all this DSP stuff if you want :)
 
Re: QRx212 & Itech settings

Here's what I came up with a few years ago on some i-techs:

HF:

Gain: -6
Delay: 0ms
X-over: 1.2k 24dB/LR

EQ:
1: 9.2k, +6, Q2.5
2: 4.5k, -3 Q4
3: 2.5k, -2 Q3.2

LF:

Gain: 0
Delay: .6ms
x-over: HPF: 77hz, 24dB/BW LFP: 1.12k, 24dB/LR

EQ:
1: 800hz, -2 Q4
2: 250hz, -3 Q2




Evan
 
Re: QRx212 & Itech settings

There are some DriveRack 260 settings floating around; that are said to be EV built.

6392.jpg



Can someone with the DX38 or DC-One post up the settings?
 
Re: QRx212 & Itech settings

Silas Pradetto said:
If you are measuring the output of an Itech, make sure you have something connected to the output, as the response changes depending on what impedance load is connected.
Click to expand...

I didn't find this to be the case when I was recreated curves from someone elses processor to go into the itech-HD's. While i didn't push max output I found no difference between an open load and an 8 ohm dummy load. Is it possible that the reactive component of a speaker could cause a drastic response change?
 
Re: QRx212 & Itech settings

Silas is referring to a series of posts by Langston Holland where Lang documented the way the HF response changed with load impedance. I don't recall if Langston posted here or over on PSW, but I do recall his rather extensive comparisons of the original I-Tech and 2 or 3 other amps.

I suspect many people with "average" hearing, on most PA systems, won't notice a difference.... it starts around 14k, IIRC. I wouldn't call it drastic, but it is audible to some folks, particularly under "listening test" conditions.
 
Re: QRx212 & Itech settings

Tim McCulloch said:
Silas is referring to a series of posts by Langston Holland where Lang documented the way the HF response changed with load impedance. I don't recall if Langston posted here or over on PSW, but I do recall his rather extensive comparisons of the original I-Tech and 2 or 3 other amps.

I suspect many people with "average" hearing, on most PA systems, won't notice a difference.... it starts around 14k, IIRC. I wouldn't call it drastic, but it is audible to some folks, particularly under "listening test" conditions.
Click to expand...

The difference is up to 5dB at 20k IIRC, and that is only comparing 8 ohm to 2 ohm. Open circuit the difference would be much more.

I will also mention: ALL class D amps employ a low-pass filter on the output, and this filter becomes part of the circuit with the load altering the response of the amp. So, any time you're measuring a Class D amp, the output must have the nominal load applied for the measurement to be accurate.
 
Re: QRx212 & Itech settings

Silas Pradetto said:
The difference is up to 5dB at 20k IIRC, and that is only comparing 8 ohm to 2 ohm. Open circuit the difference would be much more.

I will also mention: ALL class D amps employ a low-pass filter on the output, and this filter becomes part of the circuit with the load altering the response of the amp. So, any time you're measuring a Class D amp, the output must have the nominal load applied for the measurement to be accurate.
Click to expand...

And my point was that there is no PA system with flat response @ 20kHz to begin with, and air absorption will become a dominate factor at a relatively short distance. While not something to ignore, it's hardly a deal breaker in day to day PA use.
 
Re: QRx212 & Itech settings

Tim McCulloch said:
And my point was that there is no PA system with flat response @ 20kHz to begin with, and air absorption will become a dominate factor at a relatively short distance. While not something to ignore, it's hardly a deal breaker in day to day PA use.
Click to expand...

If it can so easily be taken into consideration and the tunings made perfect, why not?

I strive for the best.

PS- my Fulcrum boxes are quite flat to 20k, so much so that they have to roll off the highs so they sound more 'natural' to engineers' ears. I can easily spot a 1dB change at 16k while using them.
 
Re: QRx212 & Itech settings

Silas Pradetto said:
Just as a note: Driverack settings do NOT translate to other Harman brands, nor do they even translate to other Driverack models.
Click to expand...

The PEQs and XO filters will probably be OK, but I don't know whether the iTech in question and the DR260 share a definition for that high shelf EQ. Shelving EQs are the biggest item of inconsistency (that matters to most people) between these DSPs.
 
Re: QRx212 & Itech settings

Has anyone compared the DX38 to the Itechs DSP? Robert D from EV sent me the DX38 settings saying they should work well in the Itechs.

QRx212 Horns
HPF: 1400 Hz - LW24
LPF: 16000 Hz - BW24
Gain: -6 db
Limiter Thresh: -3 dBu
Release: 50ms

PEQ1: 1889 HZ
Q: 4.0
Gain 5 dB

PEQ2: 2700 HZ
Q: 6.0
Gain -2 dB

PEQ3: 5200 HZ
Q: 4.5
Gain 3 dB

PEQ4: 10000 HZ
Q: 2.4
Gain 12 dB

QRx212 Mids/12s
HPF: 125 Hz - LW24
LPF: 1440 Hz - BW24
Gain: 0 db
Delay: 396 us
Limiter Thresh: 0 dBu
Release: 150ms

PEQ1: 420 HZ
Q: 6.0
Gain 4 dB

PEQ2: 540 HZ
Q: 0.6
Gain -4 dB

PEQ3: 1440 HZ
Q: 4.0
Gain 3 dB

PEQ4: 2400 HZ
Q: 4.5
Gain -4 dB
 
Top Bottom