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Speaker amps for headphones - Page 160

post #2386 of 3116
Quote:
Originally Posted by Armaegis View Post
 

And those multichannel dacs get quite expensive on their own. While the DEQX seems expensive (there are costlier alternatives out there), I don't think it's too bad for all it offers in the package.

 

I've heard of some people hacking a Behringer DCX2496 with a better power supply and tapping the digital outputs directly instead of using the internal dac. Then all you'd need is a filter for phase, assuming that the drivers are at least in matching phase at the chosen crossover points. That's probably the cheapest option but requires some DIY skill.

 

Here are some good resources for your reading pleasure :)

The first link has some great visual illustrations of the effects of crossovers.

 

http://www.rane.com/note160.html

http://www.linkwitzlab.com/crossovers.htm

http://www.rane.com/note135.html

http://lenardaudio.com/education/06_x-over.html

http://www.minidsp.com/applications/dsp-basics/gain-structure-101

http://audioundone.com/three-rules-for-creating-an-effective-gain-structure

http://books.google.com/books?id=D9l6JWKKSzUC&printsec=frontcover#v=onepage&q&f=false

Quote:
Originally Posted by ALRAINBOW View Post

How about a acuphase 20 k and nonsupport
And to me support is paramount.
I went through hell setting mine up
And this is far more complex.
The built in room EQ alone is more than I want to deal with
If you think about is all the bull we go through
With dAcs and amps CPU configuration a to what end
If the speakers are effected by the room how can we get it done correctly
Pros do this all day not us.
Al

Yes it is very complex, you can make it sound worse than a passive crossover quite easily. Order of magnitude more complexity for a moderate gain in sonic performance. Active will always beat passive when setup properly though, and that has been proven. Keep at it Al!


Edited by brunk - 2/5/14 at 1:17pm
post #2387 of 3116
ThNks brunk
post #2388 of 3116

Or just stick with headphones and forget about the whole room EQ thing.

 

But then we need to stick mics into our ears and calibrate the headphone drivers and fix the phase blips, then apply the latest "ideal" headphone EQ curves as well as HRTF. The latter two can already be done (sort of), but I'm not sure on the first one.

post #2389 of 3116
I have a couple of speaker rigs.
The one at my office is the first one I wanted to go all out with
Room treatments and all. It sounds really good but far from correct
As it sounds better from a little farther away
Then on the sofa. Anyway the point is it needs
To be correct if nothing else I will knowledge about tit them I do now
It all was Greek at first and now I know much more
Headphones are much easier bit far less rewarding too.
Listening to headphones is cool but having the speakers move the air about you is much more of what it's About
Al
post #2390 of 3116
Quote:
Originally Posted by Armaegis View Post
 

Or just stick with headphones and forget about the whole room EQ thing.

 

But then we need to stick mics into our ears and calibrate the headphone drivers and fix the phase blips, then apply the latest "ideal" headphone EQ curves as well as HRTF. The latter two can already be done (sort of), but I'm not sure on the first one.

Aww, atleast get in the arena. No fear! :tongue:

post #2391 of 3116

Well, on one hand I was thinking full active crossover and room/phase correction, multi driver blah blah blah. On the other hand, maybe a single driver high efficiency full ranger driven off a SET amp or something. :rolleyes:

 

Or electrostats/planars.

 

Or just invest in some good PA gear for double duty at events and for home.

 

Not that all these things are mutually exclusive... (let's burn money on everything all at once!)

post #2392 of 3116
Quote:
Originally Posted by Armaegis View Post
 

Well, on one hand I was thinking full active crossover and room/phase correction, multi driver blah blah blah. On the other hand, maybe a single driver high efficiency full ranger driven off a SET amp or something. :rolleyes:

 

Or electrostats/planars.

 

Or just invest in some good PA gear for double duty at events and for home.

I am doing the fullrange driver thing with supertweets. The tweets make a very small improvement, but it is an improvement nonetheless. Thus, I am going from 2 amps, to 4 amps, along with an active crossover. That's not even including the price of the tweeters themselves. Talk about diminishing returns! The Fostex FE206En is what I use and it sounds just fine without the tweeter, so I can wholeheartedly recommend it to you if you want to go ultra simple. Electrostats are great, but they do present lamination problems over time, amp requirements ($$$ and heat). Not so sure about a PA system, I haven't really looked into that for double duty. High efficiency full range drivers are awesome though, especially since you can use a SET or other low power amp that doesn't carry adverse baggage with it, whether that be poor specs, cost, heat etc. You will want a subwoofer though for anything 60-80hz and under as they don't have the SPL and impact you want from those frequencies, unless you get a 5ft. enclosure. The midrange and lower treble is to die for though.


Edited by brunk - 2/5/14 at 4:31pm
post #2393 of 3116

I'm still kicking myself for missing a local deal a couple months back. There was a guy selling a FE206En in a very nicely made cabinet, for less than the cost of the drivers! But alas, I was busy during the day and when I came home it was already gone.

 

Which is all moot anyways as I really do not have the space to set up speakers at the moment. Maybe bookshelves... (been eyeballing the KEF LS50... soooo many toys, sooo many choices...)

post #2394 of 3116
Quote:
Originally Posted by Armaegis View Post
 

I'm still kicking myself for missing a local deal a couple months back. There was a guy selling a FE206En in a very nicely made cabinet, for less than the cost of the drivers! But alas, I was busy during the day and when I came home it was already gone.

 

Which is all moot anyways as I really do not have the space to set up speakers at the moment. Maybe bookshelves... (been eyeballing the KEF LS50... soooo many toys, sooo many choices...)

:eek: Yeah that's too bad you missed out on that one man! I have some Polk Lsi9's if you're interested. Very nice speakers for the size, but they are hungry little things.

post #2395 of 3116

Very tempted, but shipping into Canada would probably kill it :(

post #2396 of 3116
Quote:
Originally Posted by Armaegis View Post
 

Very tempted, but shipping into Canada would probably kill it :(

Yeah, it probably would :(

 

All the more excuse to get some FR horns and enclosure schematics so you can hack something up :biggrin:

post #2397 of 3116

I added power, current, dissipation, voltage drop and loudness calculations to the resistor network calculator page of the Android Headphone Calculator. You can see how much power is being dissipated by resistors R2 and R3 and how much is actually flowing through the headphones.

 

 
Screenshot_2014-02-06-06-55-20.jpg   Screenshot_2014-02-06-06-55-29.jpg

Edited by robrob - 2/6/14 at 4:36am
post #2398 of 3116
Sweetest!
post #2399 of 3116

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 


Edited by robrob - 2/11/14 at 11:27am
post #2400 of 3116
Thanks and I M sure if sounds fine
And thanks for all the work

Al
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