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Speaker amps for headphones - Page 161

post #2401 of 2943
Very nice work, Rob ; )
post #2402 of 2943

Rob,

 

Here's my interpretation of your very appealing photo of the Robinette Box - I hope you don't mind.  :o

 

 

 

Mike


Edited by zilch0md - 2/11/14 at 2:57pm
post #2403 of 2943

Thanks Mike, I like your cropping better than the original.

post #2404 of 2943
Quote:
Originally Posted by robrob View Post
 

Thanks Mike, I like your cropping better than the original.

What are the BNC's for? Easy access for a 'scope or something? Very cool if so :D I am enjoying my new oscilloscope very much. I can see myself having it for many years, even if i do upgrade for the simple fact that it's so portable and versatile with all the features it has. You should see this new lab supply i have, oh my goodness there's so much cool stuff to it. No way i could live without both of these pieces of test equipment now.

 

http://www.rigolna.com/products/dc-power-supplies/dp800/dp832/

post #2405 of 2943

Yea, the BNCs are optional oscilloscope outputs of the box's output signal. I've been planning to add a couple more for box input so it'll be easy to compare input to output.

 

RBInsideHeadphoneEnd.jpg 

I love the Rigol scope too and that Rigol power supply looks sexy too.

RBOscopeBypass.jpg

Audio with 'Network Bypass' in bypass position and no attenuation.


Edited by robrob - 2/11/14 at 6:08pm
post #2406 of 2943
Quote:
Originally Posted by robrob View Post
 

An update on the Robinette Box--I have spent countless hours listening to a wide variety of music through the Robinette Box to evaluate it and look for areas to improve. I used it with three A/V receivers, a 45 watt tube amplifier and a variety of Class T Tripath balanced output amplifiers. I listened with several sets of headphones including HiFiMAN HE-500s, AKG K240 Studios and modified Fostex T50RPs. I listened to headphones connected directly to the speaker outputs and compared that to the Robinette Box with the resistor network switched in and out. I listened to all three headphones connected to the balanced 4-pin XLR as well as using a single-ended adapter so I could sample all three headphones using the 1/4 inch and 1/8" single-ended headphone jacks.

When connected to amplifiers with single-ended (common ground) output I compared the sound quality with and without the R5 balanced amp common ground protection resistors in the circuit.

 

After all of the testing I can honestly say I cannot tell the difference between any of the above configurations. In fact many times I would begin to form opinions on how the resistors were affecting the sound quality and then realize the resistor network or ground protection resistors were switched out of the circuit. I'm convinced that most people would not be able to tell the difference in any of the configurations in a true blind listening test.

 

The Robinette Box works great and offers flexibility for interfacing your headphones to speaker amplifiers while delivering uncolored sound quality to your ears.

 

RobinetteBoxFront.jpg 

 

Okay so where's the switch and attachment ports for the automatic housecleaning function?  The dog walker?  The lawn mower?  The snow plow?  The orchard sprayer?  I mean, if you're gonna have a full featured box, you might as well make it do all the things that eat up the time that I could be spending listening to music...

 

 

:biggrin:

post #2407 of 2943
Quote:
Originally Posted by Gary in MD View Post
 

 

Okay so where's the switch and attachment ports for the automatic housecleaning function?  The dog walker?  The lawn mower?  The snow plow?  The orchard sprayer?  I mean, if you're gonna have a full featured box, you might as well make it do all the things that eat up the time that I could be spending listening to music...

 

 

:biggrin:

That'll be within the next 15 years, can you wait that long? :D

 

ROBOTS!

post #2408 of 2943

Meh... waited this long, what's another 15 years... on the other hand, I could just hire people to do these chores, and it would probably be cheaper than buying a robot.  But then I would have too few things to whine about...

post #2409 of 2943
Quote:
Originally Posted by Gary in MD View Post
 

 

Okay so where's the switch and attachment ports for the automatic housecleaning function?  The dog walker?  The lawn mower?  The snow plow?  The orchard sprayer?  I mean, if you're gonna have a full featured box, you might as well make it do all the things that eat up the time that I could be spending listening to music...

 

 

:biggrin:

I'm working on it. . .

post #2410 of 2943
Quote:
Originally Posted by Gary in MD View Post
 

Meh... waited this long, what's another 15 years... on the other hand, I could just hire people to do these chores, and it would probably be cheaper than buying a robot.  But then I would have too few things to whine about...

 

In some cultures, I believe this is referred to as having children...

post #2411 of 2943
Quote:
Originally Posted by Armaegis View Post
 

 

In some cultures, I believe this is referred to as having children...

Perhaps north of the border... In the US, it is mostly the other way around -- Adults do the work, kids sit around and play video games or text, or whatever.  In any case, I long ago determined that children were a bad investment, and thus don't expect to have any (that I know of).:evil: 

post #2412 of 2943
I totally disagree with the statement. It is a parents job
To educate as well delegate what a child can do both when and how.
If parents did more to improve there children overall
Our USA would be better off. It is also the me generation who is raising these kind of children
Not mine. At 57 years old I have twins 30 and a child at 7
Chdren need structure as well as discipline. Now don't shoot down my observation without
Thought. My 7 year old at piano and does karate and soccer
As well as all school work keep them busy
And they will be busy the rest if there lives for filling there dreams and yours

Al
post #2413 of 2943

Hey Gary, how is your setup now that you have the DA8? Enjoying it? Did you ever get a preamp?

:popcorn:

post #2414 of 2943

Brunk:

 

My setup sounds spectacular.  In fact, I'm happy enough that I feel no need to do further upgrades in SQ, since I see rapidly diminishing return on investment past this point.  The pre-amp is the only thing I'm still thinking about to try to allow the Cyclops to operate above ~8:30 on the dial, but I'm in no hurry on that component.  There has been some discussion in PMs that I might actually have to bypass the volume control on the Cyclops to max out the benefit of a pre-amp, and I would consider that someday -- probably just send the amp back to Klaus for modification/transformation into a Khartago -- but I'm a long way from that step right now.

 

In addition, I'm continuing to look for more DSD files of interest.  I've got a few, all jazz at this point, but there are a couple of things (Santana Abraxas, for one) that I will probably be downloading at some point soon.  The pickings are still relatively slim, and the costs relatively high, so it will be a while before I have much of a collection, but what I've heard so far sounds awesome, so I will keep hunting...

post #2415 of 2943
Quote:
Originally Posted by Gary in MD View Post
 

Brunk:

 

My setup sounds spectacular.  In fact, I'm happy enough that I feel no need to do further upgrades in SQ, since I see rapidly diminishing return on investment past this point.  The pre-amp is the only thing I'm still thinking about to try to allow the Cyclops to operate above ~8:30 on the dial, but I'm in no hurry on that component.  There has been some discussion in PMs that I might actually have to bypass the volume control on the Cyclops to max out the benefit of a pre-amp, and I would consider that someday -- probably just send the amp back to Klaus for modification/transformation into a Khartago -- but I'm a long way from that step right now.

 

In addition, I'm continuing to look for more DSD files of interest.  I've got a few, all jazz at this point, but there are a couple of things (Santana Abraxas, for one) that I will probably be downloading at some point soon.  The pickings are still relatively slim, and the costs relatively high, so it will be a while before I have much of a collection, but what I've heard so far sounds awesome, so I will keep hunting...

Glad to hear you're pleased! I am really satisfied with my DA8 too :) I am however begrudgingly staring at the soon to be released Schiit Yggdrasil DAC. If that pans out as a true 'statement' piece, I may have to get on-board. Especially if it has an excellent analog preamp with XLR outs, as I am in the process of building a fully balanced, active crossover, 4-channel monoblock amp for my horns+supertweets. :D

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