unusual mono help request - diyAudio
Go Back   Home > Forums > Amplifiers > Headphone Systems

Headphone Systems Everything to do with Headphones

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 4th October 2011, 03:34 AM   #1
diyAudio Member
 
Join Date: Mar 2008
Location: Sunny Seattle
Default unusual mono help request

Hi all,

My father recently suffered from an acoustic neuroma and lost one ear entirely. I wouldn't call him an audiophile but he has always enjoyed listening to music. The loss of half his hearing has been trying for him. Seeing him listening with a single ipod earbud, the other just clipped off, was pretty sad.

I would like to set up a good headphone system for him. I will probably make something based on a single grado driver. Not sure what kind of amp but there are a lot of interesting choices on this and other boards, Ill probably just give one a go. What I need help with is how to best sum the channels. I also wonder if there might be something better than just a simple mono signal. I thought perhaps delaying and reducing the other channel might give a pseudo stereo effect but perhaps that would just sound like an odd echo?

Thoughts, suggestions, circuits all appreciated.

Thanks,
MrKramer
  Reply With Quote
Old 4th October 2011, 08:32 AM   #2
Meldrew is offline Meldrew  England
diyAudio Member
 
Join Date: Oct 2005
If you google "bone phones" you may find something applicable.
  Reply With Quote
Old 4th October 2011, 05:10 PM   #3
diyAudio Member
 
Join Date: Mar 2008
Location: Sunny Seattle
I looked into "bone phones" but Im afraid they wont work for me. My father actually lost the entire inner ear structure from the surgery. It is not limited hearing, there is no ear there.

I know I could simply sum the inputs with a couple resistors. Seems pretty basic but I have a feel it has some limitations. Wouldn't this kill some of the signal? Wouldn't one channel drive the other to some degree? Is there an active version that would work better?

No thoughts on any psycho-acoustic tricks that bring a sense of depth/stereo to a mono signal? I dont even know how to begin searching for something like that. Most info out there starts with the assumption of 2 ears!
  Reply With Quote
Old 4th October 2011, 06:10 PM   #4
diyAudio Member
 
sofaspud's Avatar
 
Join Date: Nov 2005
Location: San Antonio
Sorry to read of your dad's hearing loss. I truly empathize. You could send the output of the two resistors into an op amp. From there, regaining any "sense of stereo" would be difficult to impossible AFAIK. Some sort of ambiance processing may add a sense of space and/or depth to the playback. It's all I can think of.
__________________
It is error only, and not truth, that shrinks from enquiry. - Thomas Paine
  Reply With Quote
Old 4th October 2011, 06:27 PM   #5
diyAudio Member
 
Frank Berry's Avatar
 
Join Date: Sep 2003
Location: Midland, Michigan
How tragic for your Father.
Summing the iPod output channels through external resistors should work for you.
You shouldn't lose anything in the audio mix. Of course, you will lose some output power from the iPod.
__________________
Frank
  Reply With Quote
Old 4th October 2011, 06:46 PM   #6
diyAudio Member
 
Join Date: Aug 2003
Location: Rochester NY
Send a message via Yahoo to JamesBoBo007
well an idea,,for what its worth....
How modding and older closed style headphone, rip out the guts and shove a set of IEM's in there, mounting both the right and left into the one side ?
or perhaps one of those big custom molded IEM's but with both drivers it ?
Good luck
  Reply With Quote
Old 5th October 2011, 05:07 AM   #7
diyAudio Member
 
Join Date: Mar 2008
Location: Sunny Seattle
I guess summing with resistors will work then.

Not sure what an IEM is...?
  Reply With Quote
Old 5th October 2011, 12:26 PM   #8
diyAudio Member
 
Join Date: Aug 2003
Location: Rochester NY
Send a message via Yahoo to JamesBoBo007
Sorry ! In Ear Monitor, IEM or earbuds
I think a custom mold with both drivers in it.....I think there would be lots of room, there are kits for you to make your own molds and stuff.....
here are some pics.custom iem - Google Search The drivers will have to be back further in the housing, a little further away from the ear canal but it should be do-able either DIY or find someone to do it for you. just google custom IEM.
Good luck !
  Reply With Quote
Old 5th October 2011, 02:11 PM   #9
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
Hi,

You really can't do anything better than simple mono, certainly not any sort
of pseudo stereo effect, any delay will give comb filtering effects and sound
downright weird.

There is a lack of detail in your plans and what quality / budget is wanted.

rgds, sreten.

Posting on Head-Fi.org - Headphone forums and reviews for audiophiles
would no doubt turn up some quality options with one damaged
driver you may get for next to nothing, and some good advice.
__________________
There is nothing so practical as a really good theory - Ludwig Boltzmann
When your only tool is a hammer, every problem looks like a nail - Abraham Maslow

Last edited by sreten; 5th October 2011 at 02:15 PM.
  Reply With Quote
Old 5th October 2011, 04:44 PM   #10
diyAudio Member
 
Join Date: Mar 2008
Location: Sunny Seattle
I am familiar with head-fi but more familiar with this board. Figured I'd start here.
Lack of detail in my plan is due to my desire for my father to hear normally conflicting with reality.
I looked at the IEM's but they look too much like hearing aids. Its a sensitive subject.

I think it might be best to simplify this. Ill make something that looks like a plug adapter that sums mono. This will let him listen comfortably at the office, coffee shop etc from any normal source without looking too odd.

As a separate project Ill introduce him to better headphones. Im a fan of grados and I think he will be too. If he likes and uses them I will look into making a little mono amp. Ive been wanting to get my feet wet with tubes, guess its a good time for that.

Thanks all,
MrKramer
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Unusual Request! Advice needed casalang Everything Else 16 27th March 2011 07:20 PM
Unusual request, 1000's of tiny plastic hinges VvvvvV Parts 1 13th November 2007 10:15 AM
difference between mixed mono and summed mono Clipped Car Audio 4 10th October 2007 11:34 AM
Unusual BJ Johnson Solid State 2 13th May 2003 06:08 PM
Dual Mono - Anti Mono Power Supplies pmkap Everything Else 3 16th February 2002 05:10 AM


New To Site? Need Help?

All times are GMT. The time now is 09:46 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2