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Old 6th August 2012, 11:32 PM   #1
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Default MiniDSP for headphone EQ & crosstalk?

I am getting the experimenter's itch again. My MiniDSP 2x4 is idle right now. One thing I have not tried yet just occurred to my brain cell:

Could a MiniDSP be used as not only an EQ but also a cross talk eliminator for headphone listening. Or in the same way, could it perform similarly to the Carver "Sonic Holography", or Ambiophonic, or other similar crosstalk cancellation schemes for stereo speakers? At first, the answer is "yes." I know that essentially all that is needed is some response shaping and delay. Supplied in the 2x4. I assume we'd need a mixer circuit to combine 2 outputs into one per channel.

Anyone experiment along these lines?
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Old 6th August 2012, 11:37 PM   #2
RNMarsh is offline RNMarsh  United States
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This is a great new subject and I hope you move forward with it. I used an auto-EQ system meant for speakers/room correction on my headphones, instead of speakers and it works great! So, I am very interested in doing both - auto-eq and cross-talk eliminator together with head phones would be awesome !
Thx, R.Marsh
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Old 7th August 2012, 02:39 AM   #3
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Can you give details of how you used auto-EQ with phones? I tried this with my Behringer DEQ2496 and could not figure out how to set the microphone.
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Old 7th August 2012, 03:00 AM   #4
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Default Need to find out how to mix signals

I think "my" idea would, effectively, give a perfect simulation of listening to a pair of speakers in an anechoic chamber

Looking at one of the MiniDSP's plug-ins, the PEQ-advanced, this should be a a perfect plug in to use. Here is the proposed test method:

1. Channels 1 and 3 will pass the unprocessed L and R input.
2. Channels 2 and 4 will pass L and R "crosstalk" signals each processed by a HRTF (to be determined) and a fixed delay: 0.2 mS or 0.4 mS, adjust these to taste.
3. Mix channel 1 & 3 to L; channel 2 & 4 to R, output to headphone amp.

Now, will someone offer me options on a mixer circuit? I know little of actual electronics. Much easier to twiddle values on a screen

Can the solution be as simple as a y-cable (e.g. outputs 1 & 3 -> L); level setting is done in the control panel...

Here is a link I stole from another forum about a blend circuit:
Headphone xfeed

Last edited by Soldermizer; 7th August 2012 at 03:05 AM.
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Old 7th August 2012, 03:38 AM   #5
jcx is offline jcx  United States
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most recorded music is intended to be listened to in a room with loudspeakers

for headphones most people add frequency shaped crosstalk to give a better impression of listening to speakers in a room where both ears clearly hear both speakers

frequency response is of "diffuse field" EQ by design in headphones for similar reasons


it may be instructive reading about the Smyth SVS Realizer system SVS Technology
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Old 7th August 2012, 05:58 AM   #6
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Good point JCX. I did a "proof of concept" just now, to show that the MiniDSP can indeed act as a mixer [without adding resistors; perhaps mine is a ghetto approach, but it works.... I can null out channel(s) when I "invert" one of the outputs. As you note, I can tailor frequency response (and optionally delay) the crosstalk signals. Right now I'm experimenting with a "Sonic Holography" type (speaker crosstalk). With Bose 901s it's not the best test bed but good for fiddling. Headphones will be next. Does anyone know a list of suggested crosstalk curves?

Last edited by Soldermizer; 7th August 2012 at 06:01 AM.
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Old 18th August 2012, 10:40 PM   #7
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Hi.

Now, My friend made handmade earphone.
The earphone have 3 unit , one Dynamic unit and two BA units (hybrid type earphone).
I request him , I want to access 3 individual unit by 6 cable (for individual GND, for Byamp system).
?????: ?×SHIKI 3way????????? ??

So, now I start DSP earphone system.

1st step
?????: ?????????
?????: ??????????????、??????????????
(1) Source is DAP ( like Sony NW-Z1000 )
(2) Convert to Balanced Line by small size Transformer
(3) Input to miniDSP 2x4 Balanced
(4) Cross Over and Time Alignment ( my friend said Dynamic Unit is little slow) and Master Volume
(5) Drive 4 BTL portable amp (class A type)
(6) Drive earphone , 2 BTL to 2 Dynamic Unit , 2 BTL to 2*2 BA Units.

This *PORTABLE* system sounds is very good :-)

Now I challenge to Dual Mono miniDSP 2*4 system for 3Way Individual Drive.

HeHe.
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Old 25th August 2012, 03:08 AM   #8
RNMarsh is offline RNMarsh  United States
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Default auto eq

Quote:
Originally Posted by Soldermizer View Post
Can you give details of how you used auto-EQ with phones? I tried this with my Behringer DEQ2496 and could not figure out how to set the microphone.
I used an auto EQ system with a microphone 'probe' adapter I made to fit on a small mic.

The auto EQ is done with the PRO Audysses system (DSP). A similar auto EQ is found in many inexpensive recievers. At first I thought to just take a cheap reciver with it in it and take it out and put it in a seperate box.

The first order of business IMO is to get a neutral, flat frequency response at the entrance to your ear canal.

Details of the probe mic are described in the latest issue of Linear Audio as part of a headphone amp project. -RNM
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Old 25th August 2012, 03:51 AM   #9
ChrisA is offline ChrisA  United States
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Quote:
Originally Posted by Soldermizer View Post
I am getting the experimenter's itch again. My MiniDSP 2x4 is idle right now. One thing I have not tried yet just occurred to my brain cell:

Could a MiniDSP be used as not only an EQ but also a cross talk eliminator for headphone listening. Or in the same way, could it perform similarly to the Carver "Sonic Holography", or Ambiophonic, or other similar crosstalk cancellation schemes for stereo speakers? At first, the answer is "yes." I know that essentially all that is needed is some response shaping and delay. Supplied in the 2x4. I assume we'd need a mixer circuit to combine 2 outputs into one per channel.

Anyone experiment along these lines?
Just a note: You can experiment with this technology without spending a dime on hardware. Get a digital file of the music. Run the DSP on the file using your desktop computer and save the result in the new file. Then listen. This is NOT the same as a real-time DSP but you hear the same result and you don't need any special electronics, just a free C compiler.
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