Bryston Headphone Interface

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James Tanner

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Re: Bryston Headphone Interface
« Reply #40 on: 15 Feb 2011, 02:33 am »
James, how about offering upgrades on the BP 26 headphone amplification section so folks can save some space on the rack??  :)

I don't think it's doable because it's a completely different circuit and op amp we are going to use.

james

Stu Pitt

Re: Bryston Headphone Interface
« Reply #41 on: 15 Feb 2011, 03:36 am »
I'd suggest having the DAC card like in the B100 as an option, James.  I see this on a lot of the most recent ones, like Red Wine Audio's headphone amp.  I wouldn't have it as standard,but I think having the option would be a huge plus.  I'm not in the market for a dedicated haedphone amp, so take that as you will.

I think the biggest factor is it's ability to drive any headphone out there.

James Tanner

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Re: Bryston Headphone Interface
« Reply #42 on: 15 Feb 2011, 04:16 pm »
From Engineering - Headphone amp project so far:

Bryston Headphone Amplifier (BHA-1)

Features:

1)Battery operation –  2 rechargeable 9v lithium LiFePO4 batteries
2)External power option via MPS-2 power supply.*
3)Volume control combined with power switch – blue led ‘on’ indicator.
4)OPA2604 op amp. Ultra low Thd + noise. (<.001%)
5)Parallel op amp outputs – 3 per channel.
6)14dB gain
7)Perfect for headphones 16 ohms or higher.
8)Cross feed circuit – bypass - in out – amber Led indicator.
9)Cross feed level variable – full in - to – 20dB.
10)Gold connectors – RCA inputs - XLR out option.
11)50k input impedance
12)Rugged construction
13)Dimensions – 2” high x 4” wide x 6” deep.



 * Higher output level with BMP2 supply. -
« Last Edit: 15 Feb 2011, 05:54 pm by James Tanner »

1ZIP

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Re: Bryston Headphone Interface
« Reply #43 on: 15 Feb 2011, 04:44 pm »
...BMP-2? :scratch:

James Tanner

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Re: Bryston Headphone Interface
« Reply #44 on: 15 Feb 2011, 05:19 pm »
...BMP-2? :scratch:

Bryston Microphone Preamp - no longer produced.

james

Napalm

Re: Bryston Headphone Interface
« Reply #45 on: 15 Feb 2011, 05:26 pm »
From Engineering - Headphone amp project so far:

Bryston Headphone Amplifier (BHA-1)

Features:

1)Battery operation –  2 rechargeable 9v lithium LiFePO4 batteries
2)External power option via BMP2 power supply.*
3)Volume control combined with power switch – blue led ‘on’ indicator.
4)OPA2604 op amp. Ultra low Thd + noise. (<.001%)
5)Parallel op amp outputs – 3 per channel.
6)14dB gain
7)Perfect for headphones 16 ohms or higher.
8)Cross feed circuit – bypass - in out – amber Led indicator.
9)Cross feed level variable – full in - to – 20dB.
10)Gold connectors – RCA inputs - XLR out option.
11)50k input impedance
12)Rugged construction
13)Dimensions – 2” high x 4” wide x 6” deep.



 * Higher output level with BMP2 supply. -

W00T no USB headphones?  :lol:

And what happened to the tone controls?  :wink:

Nap.

1ZIP

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Re: Bryston Headphone Interface
« Reply #46 on: 15 Feb 2011, 05:49 pm »
Bryston Microphone Preamp - no longer produced.

james

Ya, I know what you mean.   In the specs you really mean MPS-2.

skunark

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Re: Bryston Headphone Interface
« Reply #47 on: 15 Feb 2011, 05:53 pm »
Bryston should just offer the NAP-1.   


James Tanner

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Re: Bryston Headphone Interface
« Reply #48 on: 15 Feb 2011, 06:05 pm »
Ya, I know what you mean.   In the specs you really mean MPS-2.

Thanks - missed that :thumb:

james

Diamond Dog

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Re: Bryston Headphone Interface
« Reply #49 on: 15 Feb 2011, 06:12 pm »
James : What do your engineers estimate to be the expected useable time on a charge using the battery option? IMO tying this unit to the MPS-2 basically restricts your target market to end-users who either use Bryston pre-amps ( not that there's anything wrong with that but there's lots of us who use Bryston amps and sources but have gone another way for pre-amps ) or are unwilling to make what I'm sure would be a very considerable investment in headphone listening for the amp and power supply combo. The MPS-2 is what- $1500 on it's own, no?  :scratch:

D.
« Last Edit: 21 Feb 2011, 05:24 am by Diamond Dog »

James Tanner

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Re: Bryston Headphone Interface
« Reply #50 on: 15 Feb 2011, 06:20 pm »
James : What do your engineers estimate to be the expected useable time on a charge using the battery option? IMO tying this unit to the MPS-2 basically restricts your target market to end-users who either use Bryston pre-amps ( not that there's anything wrong with that but there's lots of us who use Bryston amps and sources but have gone another way for pre-amps ) or are willing to make what I'm sure would be a very considerable investment in headphone listening for the amp and power supply combo. The MPS-2 is what- $1500 on it's own, no?  :scratch:

D.

Hi - yes the intent was the ability to use it with the MPS-2 for our customers that already had an MPS-2 if they wished.  The battery power life between recharges would vary depending on the impedance of the phones but somewhere between 10 hours and 30 hours or more.

james

niels

Re: Bryston Headphone Interface
« Reply #51 on: 16 Feb 2011, 01:40 pm »
For headphone related stuff, this is a great site for info http://www.headphone.com/
For portable use, maybe a Ray Samuels design will do the trick http://www.raysamuelsaudio.com/#

alexone

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Re: Bryston Headphone Interface
« Reply #52 on: 16 Feb 2011, 04:47 pm »
Hi folks

A number of dealers have asked me about doing a very high quality headphone interface given the large number of young folks who listen on headphones these days.

Any input appreciated :)

james


James,

what's so wrong with the headphone input of the 26 preamplifier...now that you seriously think about a separate unit?
what's the difference?

al.

James Tanner

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Re: Bryston Headphone Interface
« Reply #53 on: 16 Feb 2011, 04:51 pm »

James,

what's so wrong with the headphone input of the 26 preamplifier...now that you seriously think about a separate unit?
what's the difference?

al.

Low impedance phones need more current than the BP26 can supply because your just using the gain section of the preamp to drive the phones.

Also using batteries means maximum signal to noise ratios.

james

Elizabeth

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Re: Bryston Headphone Interface
« Reply #54 on: 18 Feb 2011, 03:50 am »
I like the headphone out from my Bp-26 fairly well with my Sennheiser HD800s. I also own a $250 LilDotII, a several thousand $$ Singlepower (yes it is one of the brand that explodes and has killed many, many people along with maiming/blinding thousands.. at least that is the thinking of some guy over on headFi, I LOVE the notoriety, except mine is really well made.)  with a pile of tubes and socket converters for another pile of tubes,(Used paid $1,000) a Rudistor mkII $2K used for $1250. A Tadac with the tubeyness knob $500 used.. So I have headphone amps....
What is going to get me to buy the Bryston one? (I am trying to have some idea why it would be special?)
And what is the target retail? for a Bryston headphone amp?

Napalm

Re: Bryston Headphone Interface
« Reply #55 on: 18 Feb 2011, 03:58 am »
How about a BP-7 and BP-27 with improved headphones amplification?

And since we're at it..... pls add TONE CONTROLS too!!!!  :green:

Nap.

 :tempted:

Elizabeth

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Re: Bryston Headphone Interface
« Reply #56 on: 18 Feb 2011, 04:08 am »
 :banana piano:
TONE CONTROLS YEAH
 :weights:

Watson

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Re: Bryston Headphone Interface
« Reply #57 on: 18 Feb 2011, 04:46 am »
From Engineering - Headphone amp project so far:

Bryston Headphone Amplifier (BHA-1)

Features:

1)Battery operation –  2 rechargeable 9v lithium LiFePO4 batteries
2)External power option via MPS-2 power supply.*
3)Volume control combined with power switch – blue led ‘on’ indicator.
4)OPA2604 op amp. Ultra low Thd + noise. (<.001%)
5)Parallel op amp outputs – 3 per channel.
6)14dB gain
7)Perfect for headphones 16 ohms or higher.
8)Cross feed circuit – bypass - in out – amber Led indicator.
9)Cross feed level variable – full in - to – 20dB.
10)Gold connectors – RCA inputs - XLR out option.
11)50k input impedance
12)Rugged construction
13)Dimensions – 2” high x 4” wide x 6” deep.


 * Higher output level with BMP2 supply. -

It's silly, but you may have a marketing problem if you're using op-amps. There are a lot of high end headphone amps on the market now, and generally people seem to insist at the high end that everything's discrete. Even at the low end of the market, people seem to gravitate towards discrete designs (and are willing to pay more for them). It may not make sense from an engineering perspective, depending on your viewpoint, but it will probably hamper sales.

Also, Bryston is known for such great discrete designs... why switch to op-amps for this one product?

Diamond Dog

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Re: Bryston Headphone Interface
« Reply #58 on: 18 Feb 2011, 02:59 pm »


+1   :scratch:

D.

James Tanner

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Re: Bryston Headphone Interface
« Reply #59 on: 20 Feb 2011, 04:21 pm »
It's silly, but you may have a marketing problem if you're using op-amps. There are a lot of high end headphone amps on the market now, and generally people seem to insist at the high end that everything's discrete. Even at the low end of the market, people seem to gravitate towards discrete designs (and are willing to pay more for them). It may not make sense from an engineering perspective, depending on your viewpoint, but it will probably hamper sales.

Also, Bryston is known for such great discrete designs... why switch to op-amps for this one product?

Hi Watson,

Thanks for the feedback - the idea with this headphone interface unit using OP amps/batteries etc. is (1) portability, (2) superb signal to noise ratios and (3) long term battery power.  Also it is one terrific OP amp :thumb: 

We will probably build a second unit which will have a more conventional approach with discrete circuits and built in power supply etc. later on.

james