"The Lab"

[Brooko]

 
This?

 
Has an amplifier circuit - I just want to attenuate to volume match.  Nothing else in the circuit is desirable.

 

[acain]

   
 
OOOOOOOOO!!!! That looks heavy duty!
 
This is the one I made:
 

 
1x I/O to 2x I/O (goes either direction) - This is the one I made for Dmax99.
 

 
And this is my personal one (the pink thing). 2x In and 2x Out, one of the switchs is on/off/on for a mute function and the other side is just on/on. Nice and simple.
 
Both are made with gold plated components and silver plated copper wire.

PINK it's nice I like how small it is, mine is big but it was very cheap to make and it was used for switching between studio monitors.

 

[DJScope]

You can do this sort of circuit. You want to go as minimal as possible to reduce noise.
 

 
3/ Inputs > Rotary Switch > 3/ Output with Diode and potentiometer (can also put in a mute switch)
 
Nice and simple.

 

[acain]

Yeah you want the least amount of any kind of electronic parts in side if your using it for A/B testing. But a volume leveler would be pretty easy to put in a home made one.

 

[acain]

My beloved Tannoy 501 studio monitors are now in my daughters room, how does that stuff happen to me my kids confiscate anything I really like.

 

[indieman]

Here you go friend...

http://www.aliexpress.com/snapshot/6610044026.html?orderId=66800854611713

These are a solid buy for $100, let alone the $14 I paid. Check them out guys, they are a great IEM!

Thanks man. Although I'm hesitant to buy anything straight from China again. Waiting on my X2 is killing me lol.

You can do this sort of circuit. You want to go as minimal as possible to reduce noise.




3/ Inputs > Rotary Switch > 3/ Output with Diode and potentiometer (can also put in a mute switch)

Nice and simple.

Just curious: Wouldn't multiple headphones outs that all remain connected to the source effect the testing or something? It might work better using one headphone out at a time. Then just have another switch that selects between multiple headphone outs...

 

[DJScope]

   
Has an amplifier circuit - I just want to attenuate to volume match.  Nothing else in the circuit is desirable.

 
Indeed. I have the Beringer MICROAMP HA400 which is the exact same thing as that and it colours the sound and has a lot of noise. That's why I built my own switch. It works a tonne better for it's purpose. 
 
 

 
PINK it's nice I like how small it is, mine is big but it was very cheap to make and it was used for switching between studio monitors.

 
The pink box is recycled from my wife's hair bands that she gets for $2-$3. It's perfect, made from very sturdy clear plastic and is the perfect size to house 2x 3PDT switches and 4x 3.5mm female jacks in side.

 

[DJScope]

Thanks man. Although I'm hesitant to buy anything straight from China again. Waiting on my X2 is killing me lol.
Just curious: Wouldn't multiple headphones outs that all remain connected to the source effect the testing or something? It might work better using one headphone out at a time. Then just have another switch that selects between multiple headphone outs...

 
You want to keep the inputs separate to remove any voltage leaking between the sources.  The outputs share the one single line. I've included the diodes to also save you from voltage leaking in case some smarty pants decides to plug an input source into the output jack and fry the rest of your headphone and sources connected to the other outs. You can add in mute switches if you want for more flexibility, or you can just use the volume pots.
 
EDIT:
 
You could of course have 2 rotary switches back-to-back, very similar to what I've got in my pink switch. This way, only one input and one output is allowed to by active at any one time. But this then reduces flexibility somewhat. Diodes and mute switches is probably the best solution, IMO.

 

[x RELIC x]

Yep - that was my issue with using an iPhone to test SPL.  Too hard to make sure the positioning of earphones wouldn't move. With the SPL meter I have now (I have a small paper tube designed to perfectly fit the IEMs), it's no longer an issue.

..............

Besides finding the right position in the first place it's quite easy to keep the earphone tip steady in position, but I can absolutely see the benefit of using a dedicated SPL meter with the tube for ease of use and accuracy. It looks like you have the earphone some distance away from the SPL meter? Does this not affect the total sound pressure arriving at the SPL meter? Perhaps if there are more reviews to do I'd look in to grabbing one.

 

[x RELIC x]

Anyone settling in for the big fight?

 

[DJScope]

Anyone settling in for the big fight?

 
Meh... not really. Not a big fan of boxing. Too much hype involved in this fight. I hope Pacman smacks the Schiit out of Floyd, that's all I'm excited about. LOL. Floyd is a joke of a human being. I have no respect for anyone who would lay a hand on a woman.

 

[Brooko]

Besides finding the right position in the first place it's quite easy to keep the earphone tip steady in position, but I can absolutely see the benefit of using a dedicated SPL meter with the tube for ease of use and accuracy. It looks like you have the earphone some distance away from the SPL meter? Does this not affect the total sound pressure arriving at the SPL meter? Perhaps if there are more reviews to do I'd look in to grabbing one.

 
As long as the IEM is in the same position each time - it doesn't matter as its all relative.  The actual calibrated meter is way more sensitive and accurate compared to the iPhone as well.  The mics on the iPhone could be out by more than 1-2 dB in comparison. But any volume matching is better than none 

 

[Wokei]

Anyone settling in for the big fight?

Yeah baby...so looking forward to it



Manny or Mayweather ?

 

[acain]

MANNY MANNY MANNY!!!

 

[acain]

What is up Wokei what's good? I can't believe the pay day there are getting for the fight. I would love to watch it but it's $99 pay per view, and I will just wait and watch it on You Tube a couple hours after the fight. I would rather buy new iem's instead of renting the fight.