New headphone amplifier from Bryston - Page 52

I have previously read that most attenuators measure best electrically (most transparent) at 180 degree from fully close. 

 

I'm normally not fully awake until 12:00...

 

james

Don,t know.
Check it out, and you will see/hear.
It is not typical for bryston, also other amps (e.g. Violectric) sound better at position 12

Hi Folks,

 

The volume control we use in the BHA-1 is 'laser trimmed' to be accurate within 1/4dB throughout its rotation.  From 7 o'clock to 11 o'clock  there is a smaller gain (volume) change than between 11 and 3 o'clock to allow for more efficient phones being used at the lower settings.

 

Also remember the Bryston BHA-1 runs pure Class A so the volume control is actually a volume 'attenuator' - so full volume has no more or less distortion than minimum volume settings.

 

james

Using the Fostex TH-900 (25 Ohm) and low GAIN, volume control is not easy using a 0dB signal via XLR.
A lowlow Gain would be useful therefore.
So i use mdac with -20dB

Using this setting, it sounds awesome!
Edited by Hubert481 - 12/26/12 at 7:50am

Interesting, so any distortion or other negative impact introduced by the pot is constant and doesn't depend on its position? Common sense would suggest a fully open attenuator is  closer to no pot in the signal path so optimal 

 

@Hubert,

I started using my Dac and Class A headphone amp with no attenuation and only use jRiver internal 64bit volume control and quite enjoy it. Though I am still not 100% sure if it really make a difference. Could all be in my head 

Edited by zenpunk - 12/26/12 at 7:56am

 

Wow!

I  had always thought (or assumed) the manufacturer knew about the review before it was released?

 

Hi

 

Correct but full open would not work of course due to excessive gain.

 

james

 

Not always - depends on the magazine.  Some like Stereophile will send you just the technical details for any corrections and some send you the complete review if they have a Manufacturers comment section.  Most British reviews do not send you anything which is a problem in my opinion as many times they get things incorrect and there is no way to offer the correction in the same issue or before printing.

 

james

 

Oh, oh!   Now you've done it!

I'm going to have to re-read to see if I can try to spot an errors!  LOL! 

One thing I noticed, the reviewer did not use any balanced headphones.

 

I'm surprised they don't do any fact checking.......   I'll have to keep that in mind when I read the British reviews.

 

I was surprised as well - I told our distributor in England that to me it seemed like 1/2 a review.  I have been told that in the UK they are not that much into headphones - or maybe the magazine reviewers are not???

 

james

My BHA-1 is getting very, very lonely .......do you have another batch of BDA-2's ready to leave the factory soon James? 

Hi,

 

Yes we have been shipping the BDA-2's for about 3 weeks now.  as of Friday we were still 66 backordered so it will depend on when it was ordered.

 

james

 

 

Where's the link to the product and the spec?

 

Are there any reviews on it yet?

 

How much?