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HE-500, LCD2, D5000, DT770, SR80, on a speaker amp (Emotiva mini-X A-100) Project - Page 240

post #3586 of 3790
Quote:
Originally Posted by Kamakahah View Post


Yup. On the amp side between the two. You don't want to attenuate the signal before it has to travel across the wire to your amp.

 

 

makes sense, now to find them somewhere nearby.  Parts Express wants $30 for shipping....ridiculous.

post #3587 of 3790
Quote:
Originally Posted by Kamakahah View Post

Yup. On the amp side between the two. You don't want to attenuate the signal before it has to travel across the wire to your amp.

In other words put it on the amp's input. These attenuators can make your amp's noise floor hiss worse because your signal is being pushed down toward the floor (which is not lowered) where an attenuator on the amp's output pushes everything down including the noise floor.

post #3588 of 3790
Quote:
Originally Posted by robrob View Post

In other words put it on the amp's input. These attenuators can make your amp's noise floor hiss worse because your signal is being pushed down toward the floor (which is not lowered) where an attenuator on the amp's output pushes everything down including the noise floor.
good to know. I really don't want to raise the noise floor.

So am I better off with putting resistors on the speaker outputs?
post #3589 of 3790

Plug your headphones into the amp right now and put your music on pause. Turn the amp up. If you don't hear noise, then you're fine. If you do, consider how loud your music will be at that point.

 

Those inline RCA attenuators are basically resistor dividers anyways. Or you could just turn the volume of your dac down.

 

I'm not saying this is necessarily a better solution than resistors on the amp output, but it's simpler, and if it doesn't impact the sound in a noticeable way and doesn't actually cost much, then go for it.

post #3590 of 3790

...and it is 6db + 6db = 12 db for both plugs on one channel, not 12+12  reading from the 1 star review about labeling confusion.

I knew I saw this simpler solution months ago for powerful speaker amp matching.

 

Thanks Armaegis.

post #3591 of 3790
Quote:
Originally Posted by Armaegis View Post
 

Plug your headphones into the amp right now and put your music on pause. Turn the amp up. If you don't hear noise, then you're fine. If you do, consider how loud your music will be at that point.

 

Those inline RCA attenuators are basically resistor dividers anyways. Or you could just turn the volume of your dac down.

 

I'm not saying this is necessarily a better solution than resistors on the amp output, but it's simpler, and if it doesn't impact the sound in a noticeable way and doesn't actually cost much, then go for it.

^ I agree.

post #3592 of 3790
Quote:
Originally Posted by robrob View Post
 

Robinette Box V3 Layout Diagram

Robinette_Box_V3.png

More info on the Robinette Box here.

 

That's great, thanks Rob.


Can you explain when you would recommend using each of the different R2 and R3 values?  I understand that they raise the attenuation but when does it get too much?

post #3593 of 3790
Quote:
Originally Posted by bassboysam View Post


good to know. I really don't want to raise the noise floor.

So am I better off with putting resistors on the speaker outputs?



Attenuators at the amp's inputs will give you more usable volume knob range, but won't lower the noise floor. You can achieve the exact same effect by lowering the digital volume on your computer or DAC. 

Resistors on the speaker outputs are the way to go. You can also buy resistor adapters on Ebay that have the resistors built into a 1/4" -> 1/8" plug. 

post #3594 of 3790
Quote:
Originally Posted by manbear View Post



Attenuators at the amp's inputs will give you more usable volume knob range, but won't lower the noise floor. You can achieve the exact same effect by lowering the digital volume on your computer or DAC. 


Resistors on the speaker outputs are the way to go. You can also buy resistor adapters on Ebay that have the resistors built into a 1/4" -> 1/8" plug. 

So would I just wire the resistors across the +\- terminals of each channel?
post #3595 of 3790
Quote:
Originally Posted by bassboysam View Post

So would I just wire the resistors across the +\- terminals of each channel?

That's one way to do it. I attached mine in series instead, one between each + terminal and the headphones.
post #3596 of 3790
Quote:
Originally Posted by bassboysam View Post

So would I just wire the resistors across the +\- terminals of each channel?
Not unless it's a tube amp and you are just trying to provide the proper load. Parallel connection will provide absolutely ZERO attenuation. You either need a series connection with the headphone or a resistor devider network.
post #3597 of 3790
Quote:
Originally Posted by potterma View Post



Not unless it's a tube amp and you are just trying to provide the proper load. Parallel connection will provide absolutely ZERO attenuation. You either need a series connection with the headphone or a resistor devider network.

 



got it, thanks!
post #3598 of 3790

Someone a few pages back asked how Emotiva a-100 mini-X pairs with HD-800.

 

All four of these TOTL 'phones sound great with Emotiva a-100 mini-X amplifier

modified with robrob's resistor design....Thanks, Rob!

 

The OPPO HA-1 served DAC duty.

 

Garage 1217's (Jeremy and Frans) "Ember" Hybrid Amp on top is also very good

and has no trouble driving them, including HiFi Man HE-6 to ~ 90 to 95 dB.

 

BMF

 

 

The first two are on long term loan from a good friend.

 

Another good friend loaned me his LCD3 and Abyss for over a month.

They, too, sound great from my modified Emotiva a-100 mini-X.

 

Left to Right: HiFi Man HE-6, Sennheiser HD-800, OPPO PM-1, Audeze LCD2 v1

 

 

 

 

garage 1217 hybrid amp - Ember - with NOS Telefunken

E88CC tube sounds wonderful.


Edited by bluemonkeyflyer - 6/14/14 at 2:59pm
post #3599 of 3790

How does the Ember compare to the Emotiva? Was a big fan of the Sunrise 2 with the HE-500, but just lacked a little bit of grunt, but otherwise had very good synergy together.

post #3600 of 3790
I just got an ember as well. Compared to the emotiva, the main difference I am noticing is a bigger soundstage with more separation. The ember gives each instrument lots of room to breathe, whereas the emotiva gets congested at times IMO.

This separation also brings out more microdetails. I just listened to one of my favorite songs, I am you by shpongle, with the ember and I noticed some new layers of subtle effects that I hadn't heard before.

The emotiva's bass might be a bit tighter and punchier than the ember's, but the ember is far from the lush/loose end of the tube amp spectrum. Of course, this is also tube dependent. I'm using voskhod 12ax7 right now.

Also, I am using an he400. With the ember on medium output impedance, I have the volume knob at 9 with -10 db in foobar. This thing has some major juice.
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