"Dave Plowman (News)" wrote in
:

In article ,
Dan Abnormal wrote:
I've just bought a Cyrus system and wonder whether it would be worth
upgrading from The Bay interconnects, which sound a little 'thin' now.
Or would Cyrus' own interconnects be better?

For a piece of co-ax a couple of feet long or so to remove some of the
bass - which is what sounding thin means - would be quite an achievement.
Unless, of course there's been a small series capacitor added somewhere.


Or possibly a resistor from the center conductor to ground.

r


--
Nothing beats the bandwidth of a station wagon filled with DLT tapes.

In article ,
Rich.Andrews wrote:
For a piece of co-ax a couple of feet long or so to remove some of the
bass - which is what sounding thin means - would be quite an
achievement. Unless, of course there's been a small series capacitor
added somewhere.


Or possibly a resistor from the center conductor to ground.

Considering the low output impedance of well designed equipment, more like
a short? ;-)

--
*Arkansas State Motto: Don't Ask, Don't Tell, Don't Laugh.

Dave Plowman London SW
To e-mail, change noise into sound.

"Dave Plowman (News)" wrote in
:

In article ,
Rich.Andrews wrote:
For a piece of co-ax a couple of feet long or so to remove some of
the bass - which is what sounding thin means - would be quite an
achievement. Unless, of course there's been a small series capacitor
added somewhere.


Or possibly a resistor from the center conductor to ground.

Considering the low output impedance of well designed equipment, more
like a short? ;-)


There is some equipment that is well designed but designed to drive a high
impedance load. In cases like that, loading it down with 600 ohms instead
of something like 50k ohms will result in a roll off of low frequencies.

r


--
Nothing beats the bandwidth of a station wagon filled with DLT tapes.

In article ,
Rich.Andrews wrote:
For a piece of co-ax a couple of feet long or so to remove some of
the bass - which is what sounding thin means - would be quite an
achievement. Unless, of course there's been a small series capacitor
added somewhere.


Or possibly a resistor from the center conductor to ground.

Considering the low output impedance of well designed equipment, more
like a short? ;-)


There is some equipment that is well designed but designed to drive a
high impedance load. In cases like that, loading it down with 600 ohms
instead of something like 50k ohms will result in a roll off of low
frequencies.

In which case changing the interconnect will make not a scrap of
difference.

Have you got any examples of domestic equipment with an 600 ohm input
impedance?

--
*Forget the Joneses, I keep us up with the Simpsons.

Dave Plowman London SW
To e-mail, change noise into sound.

"Dave Plowman (News)" wrote in
:

In article ,
Rich.Andrews wrote:
For a piece of co-ax a couple of feet long or so to remove some of
the bass - which is what sounding thin means - would be quite an
achievement. Unless, of course there's been a small series
capacitor added somewhere.


Or possibly a resistor from the center conductor to ground.

Considering the low output impedance of well designed equipment, more
like a short? ;-)


There is some equipment that is well designed but designed to drive a
high impedance load. In cases like that, loading it down with 600 ohms
instead of something like 50k ohms will result in a roll off of low
frequencies.

In which case changing the interconnect will make not a scrap of
difference.


Provided the interconnect mfgr doesn't tie a resistor between the center
and ground or do anything else to lower the impedance.


r



--
Nothing beats the bandwidth of a station wagon filled with DLT tapes.

Dave Plowman (News) wrote:

Have you got any examples of domestic equipment with an 600 ohm input
impedance?

An attenuating interconnect accidentally fitted back-to-front?

--
Eiron.

In article ,
Eiron wrote:
Have you got any examples of domestic equipment with an 600 ohm input
impedance?

An attenuating interconnect accidentally fitted back-to-front?

That's not the equipment, though?

--
*According to my calculations, the problem doesn't exist.

Dave Plowman London SW
To e-mail, change noise into sound.

In article ,
Rich.Andrews
wrote:
"Dave Plowman (News)" wrote in
:


Considering the low output impedance of well designed equipment, more
like a short? ;-)


There is some equipment that is well designed but designed to drive a
high impedance load. In cases like that, loading it down with 600 ohms
instead of something like 50k ohms will result in a roll off of low
frequencies.

I'm not sure if things have changed. However the normal assumption for
domestic audio sources in the 1970's and 1980's was that the source (CD
player, Tuner, etc) should work as per spec into loads down to 10kOhm in
parallel with 1000 pF. The assumption being that any preamp input would
have an impedance that was this, or higher.

So far as I know, 600 Ohm input impedance would be unusual in domestic
equipment. Although I think some items may use it with balanced inputs. If
so, I'd assume the source would then be expected to use a matching output.

Hence in domestic practice. I would assume that having a 600 Ohm load on a
normal single-ended output would be unusual and not recommended.

Slainte,

Jim

--
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Audio Misc http://www.st-and.demon.co.uk/AudioMisc/index.html
Armstrong Audio http://www.st-and.demon.co.uk/Audio/armstrong.html
Barbirolli Soc. http://www.st-and.demon.co.uk/JBSoc/JBSoc.html

"Jim Lesurf" wrote in message



I'm not sure if things have changed. However the normal assumption for
domestic audio sources in the 1970's and 1980's was that the source
(CD player, Tuner, etc) should work as per spec into loads down to
10kOhm in parallel with 1000 pF. The assumption being that any preamp
input would have an impedance that was this, or higher.

Agreed. AFAIK 10K and 1000 pF was the standard IHFM testing load for
line-level outputs. 1000 pF represents about 30 feet of standard shielded
cable.

So far as I know, 600 Ohm input impedance would be unusual in domestic
equipment.

600 ohm input impedance is unusual even in pro audio gear. Most pro audio
gear has an input impedance that is 2,000 ohms or above.

Although I think some items may use it with balanced inputs.

I know of no cases where pro audio gear has an input impedance that low.
Even mic inputs bottom out around 2K.

If so, I'd assume the source would then be expected to use a matching
output.

Most pro audio gear has an output impedance of 75-150 ohms, and can deliver
an undistorted +4 (abouit 1.25 volts) or greater into a 600 ohm load. Into
more typical loads, pro gear can delover 2 - 10 volts. Most pro gear can be
driven to full rated output with +4.

Hence in domestic practice. I would assume that having a 600 Ohm load
on a normal single-ended output would be unusual and not recommended.

Totally agreed.