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PostPosted: Thu Jul 08, 2010 9:56 pm 
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Dog
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Joined: Tue Dec 14, 2004 12:26 pm
Posts: 4981
Location: Lisbon, Portugal
I don't know the answer to this question, I guess it's pure entertainment.

Hi-Fi World, August 2010.

There's a review on some Burson Audio Buffer AB-160, which "promises to help out hi-fis with impedance mismatch problems".

Nevermind the review, let's jump to the "measured performance" corner.
No graphs, only this text.

Quote:
"Measured Performance
This device is an impedance converter: it drives a line from a low output impedance and can be used, in theory, to lessen losses in long lines.
That's the engineering view; some say such converters improve sound quality, for reasons not fully understood.
I was unable to open the case to look inside, but a 9V maximum output figure before overload suggests that inside lurks a high performance audio silicon chip; there are plenty available from Burr Brown, Thats, TI and National Semiconductor, etc.
The circuit was all but transparent with a bandwidth of d.c. to 77Khz, -1dB and minimal distortion (0.0009%).
It passed a square wave perfectly and noise was minimal, but modern 'mic preamp' ICs and audio preamps are as good as this.
Output impedance was on the high side at 1.2KOhms, however, not the 100 ohms or thereabouts expected from a dedicated line driver chip, of which there are many, so the Burson isn't for really long lines and heavy capacitance loads and it doesn't use a dedicated line driver IC.
Results are best judged by listening.
NK "

:shock:

As if this was not hilarious enough, the verdict:
"An interesting product that puts the listener right at the heart of the performance."

For:
- enhanced detail
- energy
- passionate performance

Against:
- only two inputs
- reduced soundstage

_________________
Carlos Filipe

"Any intelligent fool can make things bigger, more complex, and more violent. It takes a touch of genius - and a lot of courage - to move in the opposite direction." Albert Einstein


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PostPosted: Thu Jul 08, 2010 9:57 pm 
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Dog
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Joined: Tue Dec 14, 2004 12:26 pm
Posts: 4981
Location: Lisbon, Portugal
Should I claim my money back?
This printed paper is not even good for the bathroom.

_________________
Carlos Filipe

"Any intelligent fool can make things bigger, more complex, and more violent. It takes a touch of genius - and a lot of courage - to move in the opposite direction." Albert Einstein


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PostPosted: Thu Jul 08, 2010 11:27 pm 
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Benjamin
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Joined: Mon Dec 13, 2004 3:29 pm
Posts: 4336
Location: Somewhere other than here.
Let me see if I have this right...........

It is an "impedance converter", that reduces losses in long lines, yet has a 1.2kohm output Z.

Is that right?

It enhances detail, yet reduces soundstage. WTF?

Yeah..........of no value in the excremeditation chamber.

Jocko


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PostPosted: Fri Jul 09, 2010 5:43 pm 
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Goat

Joined: Sat Mar 04, 2006 5:26 pm
Posts: 576
Location: Nova Scotia
I was killing time at a bookstore not that long ago, and picked up a magazine I couldn't remember the name of, flipped through it for a chuckle and put it back on the shelf. The reviews are always so formulaic:

- Introducing <product> from <company>
- Bunch of pictures of <product>
- Blurb about <company>, describing that because they're located at <location> (farm country, near the ocean, whatever) they've obviously got a passion for good audio design or something like that.
- Blurb about <product> and how <company> put their heart and soul into <product>
- Description of <pseudo-technology> that <product> introduces
- Q/A with <company person> who says a bunch of stuff about <pseudo-technology> but doesn't clarify anything
- A listening test that sounds like someone describing an acid trip. The soundstage was so broad, it first nibbled on my toes, then enveloped me and gave me a hug!
- Final commentary giving a glowing review.

If you replace <company> with <person> and <product> with <strain of weed>, the reviews will be almost 100% identical to something you'd see in a High Times magazine. Seriously!


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