Connect TV audio output to old stereo amp

[Al Moodie]

Hi,

Not sure if this is the correct forum, but it is the only one I am
familiar with.

I have an old audio system, Technics SU 8022 stereo amp attached to
large quaulity technics speakers, works fine.
Have a Sony Bravia LCD TV which has an audio output socket which I use
for headphones occasionally.
Does it make sense to attempt to connect the TV's audio output to the
Technics amp to get better sound quality.

Sony TV Audio out:
500mVrms (100% modulation)
More than 1 Vrms at max volume setting
Impedance 47k ohms

Technics amp input:
Phono 2.5mV 47k ohm
Aux 150mV 27k ohm

I assume I will need some kind of voltage/impedance matching between
the two units.

Al Moodie.

 

[William Sommerwerck]

There's no reason you shouldn't connect the TV. You will definitely get
better sound. *

See if the TV has a regular pair of RCA audio-output jacks, which you should
use instead of the headphone jack. Regardless of which you use, there will
be no need for voltage or impedance matching. (I don't know where you got
your specs, but the TV does not have a 47K audio output impedance. It's
about 1/20 that.)

One possible problem... If your TV is connected to a cable system, you might
have hum problems. You'll need an isolation transformer. The MCM 33-8700 is
a good choice; I use it in my system. A double-male coupler (MCM 33-480)
might also be handy.

* Cheap speakers have gotten surprisingly good. If your Technics speakers
are really old and really mediocre, there's a chance the speakers that came
with the TV might have better over-all quality.

 

[Al Moodie]

On Sun, 24 Jul 2011 07:47:59 -0700, "William Sommerwerck"
<grizzledgeezer@comcast.net> wrote:

There's no reason you shouldn't connect the TV. You will definitely get
better sound. *

See if the TV has a regular pair of RCA audio-output jacks, which you should
use instead of the headphone jack. Regardless of which you use, there will
be no need for voltage or impedance matching. (I don't know where you got
your specs, but the TV does not have a 47K audio output impedance. It's
about 1/20 that.)

Thanks for your response.

I want to use the headphone jack for output because using the jack
mutes the TVs speakers and allows me to control volume using the TV
remote (the stereo amp does not have a remote).

I assume this is just a cabling problem, headphone jack male split to
RCA audio plugs.

Al.

 

[Peter2]

"Al Moodie" <nospam@nospam.com> wrote in message
news:g7eo27h3as1qp9ko77npqo6u978ug0gkht@4ax.com...

On Sun, 24 Jul 2011 07:47:59 -0700, "William Sommerwerck"
grizzledgeezer@comcast.net> wrote:

There's no reason you shouldn't connect the TV. You will definitely get
better sound. *

See if the TV has a regular pair of RCA audio-output jacks, which you
should
use instead of the headphone jack. Regardless of which you use, there will
be no need for voltage or impedance matching. (I don't know where you got
your specs, but the TV does not have a 47K audio output impedance. It's
about 1/20 that.)


Thanks for your response.

I want to use the headphone jack for output because using the jack
mutes the TVs speakers and allows me to control volume using the TV
remote (the stereo amp does not have a remote).

I assume this is just a cabling problem, headphone jack male split to
RCA audio plugs.

Al.

I'd recommend trying the RCA jacks first. Most (many) have circuitry that
detects a connection and mutes the output. The headphone jack is likely low
impedance and as such won't match the amplifer as well.

 

[William Sommerwerck]

I'd recommend trying the RCA jacks first. Most (many) have
circuitry that detects a connection and mutes the output. The
headphone jack is likely low impedance and as such won't
match the amplifer as well.

There's no need for matched impedance.

 

On Sun, 24 Jul 2011 10:15:13 -0400, Al Moodie <nospam@nospam.com>
wrote:

Hi,

Not sure if this is the correct forum, but it is the only one I am
familiar with.

I have an old audio system, Technics SU 8022 stereo amp attached to
large quaulity technics speakers, works fine.
Have a Sony Bravia LCD TV which has an audio output socket which I use
for headphones occasionally.
Does it make sense to attempt to connect the TV's audio output to the
Technics amp to get better sound quality.

Sony TV Audio out:
500mVrms (100% modulation)
More than 1 Vrms at max volume setting
Impedance 47k ohms

Technics amp input:
Phono 2.5mV 47k ohm
Aux 150mV 27k ohm

I assume I will need some kind of voltage/impedance matching between
the two units.

Al Moodie.
There are several issues.

First of all, do not use the phono input; it is designed for a
magnetic cartridge, has RIAA equilization, and will seriously
overamplify the bass frequencies.

Second, I would spend some time reading the manual for the TV, and
studying the function of the audio output RCA jacks. If they can be
configured to suit your purposes, they would be preferable to the
headphone jack.

Third, you are setting up a situation where the TV will be turned
off, but the amplifier will still be on. For a number of reasons,
this is not desirable.

PlainBill

 

[Gareth Magennis]

"Peter2" <peter2@hipson.net> wrote in message
news:j0hfac$vmb$1@dont-email.me...

"Al Moodie" <nospam@nospam.com> wrote in message
news:g7eo27h3as1qp9ko77npqo6u978ug0gkht@4ax.com...
On Sun, 24 Jul 2011 07:47:59 -0700, "William Sommerwerck"
grizzledgeezer@comcast.net> wrote:

There's no reason you shouldn't connect the TV. You will definitely get
better sound. *

See if the TV has a regular pair of RCA audio-output jacks, which you
should
use instead of the headphone jack. Regardless of which you use, there
will
be no need for voltage or impedance matching. (I don't know where you got
your specs, but the TV does not have a 47K audio output impedance. It's
about 1/20 that.)


Thanks for your response.

I want to use the headphone jack for output because using the jack
mutes the TVs speakers and allows me to control volume using the TV
remote (the stereo amp does not have a remote).

I assume this is just a cabling problem, headphone jack male split to
RCA audio plugs.

Al.

I'd recommend trying the RCA jacks first. Most (many) have circuitry that
detects a connection and mutes the output. The headphone jack is likely
low impedance and as such won't match the amplifer as well.

Really? I've not heard of this function with an RCA socket, but I don't
deal with much domestic audio equipment.

Can you or someone post a link to how this works?


Cheers,


Gareth.

 

[William Sommerwerck]

You are setting up a situation where the TV will be turned off,
but the amplifier will still be on. For a number of reasons, this
is not desirable.

Other than wasting electricity, what would they be? I've already pointed out
the possible ground loop, but that occurs whether or not the TV is on.

 

[Al Moodie]

On Sun, 24 Jul 2011 10:44:59 -0700, PlainBill@yawhoo.com wrote:

First of all, do not use the phono input; it is designed for a
magnetic cartridge, has RIAA equilization, and will seriously
overamplify the bass frequencies.

I am using the AUX input.

Second, I would spend some time reading the manual for the TV, and
studying the function of the audio output RCA jacks. If they can be
configured to suit your purposes, they would be preferable to the
headphone jack.

I have used the headphone jack because it is accessible from the side
of the TV. Works just fine and the sound quality has improved. To
access the audio output jacks I will have to remove the TV from the
wall to gain access, a pain, but will do so when I have more time.

Third, you are setting up a situation where the TV will be turned
off, but the amplifier will still be on. For a number of reasons,
this is not desirable.

Other than I forget to turn it off when I go to bed, how is this
undesireable.

You have given me advice before on badcaps forum, small world, thanks
again.

Thanks to all who posted.

Al.

 

[Peter2]

"Gareth Magennis" <sound.service@btconnect.com> wrote in message
news:nr_Wp.58002$yn7.35261@newsfe20.ams2...

"Peter2" <peter2@hipson.net> wrote in message
news:j0hfac$vmb$1@dont-email.me...

"Al Moodie" <nospam@nospam.com> wrote in message
news:g7eo27h3as1qp9ko77npqo6u978ug0gkht@4ax.com...
On Sun, 24 Jul 2011 07:47:59 -0700, "William Sommerwerck"
grizzledgeezer@comcast.net> wrote:

There's no reason you shouldn't connect the TV. You will definitely get
better sound. *

See if the TV has a regular pair of RCA audio-output jacks, which you
should
use instead of the headphone jack. Regardless of which you use, there
will
be no need for voltage or impedance matching. (I don't know where you
got
your specs, but the TV does not have a 47K audio output impedance. It's
about 1/20 that.)


Thanks for your response.

I want to use the headphone jack for output because using the jack
mutes the TVs speakers and allows me to control volume using the TV
remote (the stereo amp does not have a remote).

I assume this is just a cabling problem, headphone jack male split to
RCA audio plugs.

Al.

I'd recommend trying the RCA jacks first. Most (many) have circuitry that
detects a connection and mutes the output. The headphone jack is likely
low impedance and as such won't match the amplifer as well.




Really? I've not heard of this function with an RCA socket, but I don't
deal with much domestic audio equipment.

Can you or someone post a link to how this works?


Cheers,


Gareth.

I've seen mostly mechanical type switching. I've a TV that does just this,
plug in to the RCAs and the speakers are muted.

 

On Jul 24, 7:15 am, Al Moodie <nos...@nospam.com> wrote:

Hi,

Not sure if this is the correct forum, but it is the only one I am
familiar with.

I have an old audio system, Technics SU 8022 stereo amp attached to
large quaulity technics speakers, works fine.
Have a Sony Bravia LCD TV which has an audio output socket which I use
for headphones occasionally.
Does it make sense to attempt to connect the TV's audio output to the
Technics amp to get better sound quality.

Sony TV Audio out:
500mVrms (100% modulation)
More than 1 Vrms at max volume setting
Impedance 47k ohms

Technics amp input:
Phono 2.5mV 47k ohm
Aux 150mV 27k ohm

I assume I will need some kind of voltage/impedance matching between
the two units.

Al Moodie.

I'm doing the same as you. I'm using a 55" LG set, Headphone out to an
old (1985) Technics receiver and a pair of JBL speakers. I also have a
solid state relay to turn on the receiver using one of the USB inputs
of the TV to get the 5 Volts to run the SSR. The only 'quirk' is the
LG will not allow balance, bass or treble adjustments when the
headphone jack is used. I tried changing settings without the
headphone jack and as soon as the headphone connector is used it
resets center.

G˛

 

[spamtrap1888]

On Jul 24, 7:47 am, "William Sommerwerck" <grizzledgee...@comcast.net>
wrote:

There's no reason you shouldn't connect the TV. You will definitely get
better sound. *

See if the TV has a regular pair of RCA audio-output jacks, which you should
use instead of the headphone jack. Regardless of which you use, there will
be no need for voltage or impedance matching. (I don't know where you got
your specs, but the TV does not have a 47K audio output impedance. It's
about 1/20 that.)

Does the TV have a separate headphone amp, or does the headphone
simply connect to the speaker amp? Audio power amps are meant to
supply a great deal of current compared to what a high impedance input
expects -- this would not present a problem for driving a preamp?

 

On Sun, 24 Jul 2011 17:49:43 -0400, Al Moodie <nospam@nospam.com>
wrote:

On Sun, 24 Jul 2011 10:44:59 -0700, PlainBill@yawhoo.com wrote:

First of all, do not use the phono input; it is designed for a
magnetic cartridge, has RIAA equilization, and will seriously
overamplify the bass frequencies.

I am using the AUX input.

Second, I would spend some time reading the manual for the TV, and
studying the function of the audio output RCA jacks. If they can be
configured to suit your purposes, they would be preferable to the
headphone jack.

I have used the headphone jack because it is accessible from the side
of the TV. Works just fine and the sound quality has improved. To
access the audio output jacks I will have to remove the TV from the
wall to gain access, a pain, but will do so when I have more time.

Third, you are setting up a situation where the TV will be turned
off, but the amplifier will still be on. For a number of reasons,
this is not desirable.

Other than I forget to turn it off when I go to bed, how is this
undesireable.

You have given me advice before on badcaps forum, small world, thanks
again.

Thanks to all who posted.

Al.
Wasting electricity is the obvious problem. Possible transients as

the set powers up and down is a second. Accelerated aging of the
components in the amp would be a third.

PlainBill

 

[GS]

On Jul 24, 1:01 pm, "William Sommerwerck" <grizzledgee...@comcast.net>
wrote:

I'd recommend trying the RCA jacks first. Most (many) have
circuitry that detects a connection and mutes the output. The
headphone jack is likely low impedance and as such won't
match the amplifer as well.

There's no need for matched impedance.

Ahh, technology.

Had a Vizio 32 inch in living room. Front facing speakers, and I
hooked a little subwoofer, sounded
Decent.

Upgraded to a 40 inch, nice picture by the way even though it a Coby.
I spend about an hour trying to get any audio.
Finally figured out my cable box does not have full HDMI out .iwas
using a digital to HDMI cable, and separate audio in cable. I could
not do that on the Coby, had to use RGB and audio. Also it has no
audio line out. Must use optical out to amp. The big picture has like
most bottom or side speakers, sucks. I attached two cardboard
reflectors to get some good sound. Also no headphone output. I be
installing a optical feed in the future. I might finish my
entertainment room first, and that will have at least 3 tv's. The good
thing about using this IPAD, I can control multiple cable boxes in the
same room with comcasts app.

Greg

 

[GS]

By the way, these color picture settings really suck. Way too much
color and contrast. What are they thinking?
I guess they look good in the show room. Maybe the better sets are
better. I got the Coby looking good in custom. It's like I go around
looking at different shows. Just like getting a good new set of
speakers, I got to go through my library of songs.

Greg

 

[Arfa Daily]

"Gareth Magennis" <sound.service@btconnect.com> wrote in message
news:nr_Wp.58002$yn7.35261@newsfe20.ams2...

"Peter2" <peter2@hipson.net> wrote in message
news:j0hfac$vmb$1@dont-email.me...

"Al Moodie" <nospam@nospam.com> wrote in message
news:g7eo27h3as1qp9ko77npqo6u978ug0gkht@4ax.com...
On Sun, 24 Jul 2011 07:47:59 -0700, "William Sommerwerck"
grizzledgeezer@comcast.net> wrote:

There's no reason you shouldn't connect the TV. You will definitely get
better sound. *

See if the TV has a regular pair of RCA audio-output jacks, which you
should
use instead of the headphone jack. Regardless of which you use, there
will
be no need for voltage or impedance matching. (I don't know where you
got
your specs, but the TV does not have a 47K audio output impedance. It's
about 1/20 that.)


Thanks for your response.

I want to use the headphone jack for output because using the jack
mutes the TVs speakers and allows me to control volume using the TV
remote (the stereo amp does not have a remote).

I assume this is just a cabling problem, headphone jack male split to
RCA audio plugs.

Al.

I'd recommend trying the RCA jacks first. Most (many) have circuitry that
detects a connection and mutes the output. The headphone jack is likely
low impedance and as such won't match the amplifer as well.




Really? I've not heard of this function with an RCA socket, but I don't
deal with much domestic audio equipment.

Can you or someone post a link to how this works?


Cheers,


Gareth.

Not sure I've ever seen any on a TV set, but phono (RCA) sockets with built
in mechanical switches are certainly to be found on some amps. One that
comes to mind is a big Yammy AV amp that uses them for the 5.1 discreet
inputs, I think. The switches go bad resulting in intermittent or missing
channels when it is working in 'normal' mode ...

Arfa

 

[Arfa Daily]

<PlainBill@yawhoo.com> wrote in message
news:nplo2719lrg5jpaghg40ltl8o8bekcb42c@4ax.com...

On Sun, 24 Jul 2011 10:15:13 -0400, Al Moodie <nospam@nospam.com
wrote:

Hi,

Not sure if this is the correct forum, but it is the only one I am
familiar with.

I have an old audio system, Technics SU 8022 stereo amp attached to
large quaulity technics speakers, works fine.
Have a Sony Bravia LCD TV which has an audio output socket which I use
for headphones occasionally.
Does it make sense to attempt to connect the TV's audio output to the
Technics amp to get better sound quality.

Sony TV Audio out:
500mVrms (100% modulation)
More than 1 Vrms at max volume setting
Impedance 47k ohms

Technics amp input:
Phono 2.5mV 47k ohm
Aux 150mV 27k ohm

I assume I will need some kind of voltage/impedance matching between
the two units.

Al Moodie.
There are several issues.

First of all, do not use the phono input; it is designed for a
magnetic cartridge, has RIAA equilization, and will seriously
overamplify the bass frequencies.

Second, I would spend some time reading the manual for the TV, and
studying the function of the audio output RCA jacks. If they can be
configured to suit your purposes, they would be preferable to the
headphone jack.

Third, you are setting up a situation where the TV will be turned
off, but the amplifier will still be on. For a number of reasons,
this is not desirable.

PlainBill

My AV amp stays on all the time, and it doesn't cause me any problems ...

Arfa

 

[Arfa Daily]

"Al Moodie" <nospam@nospam.com> wrote in message
news:sd9o279s6jhotd034for9red97cok8kguk@4ax.com...

Hi,

Not sure if this is the correct forum, but it is the only one I am
familiar with.

This is a good place to get the advice that you need, but please note, it is
not a forum, it is a usenet newsgroup. Forums are typically web based and
have moderators who have access to the content allowing them to edit or
remove posts. Usenet news groups usually do not have any kind of moderation.
You might be accessing this group via a web-based 'front end'. There are
quite a few about now. It doesn't really make a lot of difference from a
user point of view, unless you get into an argument. Also, replies posted on
the group can be slow to be trawled by the front end site. If you are
accessing via one of these websites, you might consider making use of one of
the free usenet clients such as Xnews, for an altogether better experience.

Arfa

 

[GS]

On Jul 26, 9:41 pm, "Arfa Daily" <arfa.da...@ntlworld.com> wrote:

PlainB...@yawhoo.com> wrote in message

news:nplo2719lrg5jpaghg40ltl8o8bekcb42c@4ax.com...





On Sun, 24 Jul 2011 10:15:13 -0400, Al Moodie <nos...@nospam.com
wrote:

Hi,

Not sure if this is the correct forum, but it is the only one I am
familiar with.

I have an old audio system, Technics SU 8022 stereo amp attached to
large quaulity technics speakers, works fine.
Have a Sony Bravia LCD TV which has an audio output socket which I use
for headphones occasionally.
Does it make sense to attempt to connect the TV's audio output to the
Technics amp to get better sound quality.

Sony TV Audio out:
500mVrms (100% modulation)
More than 1 Vrms at max volume setting
Impedance 47k ohms

Technics amp input:
Phono 2.5mV 47k ohm
Aux 150mV 27k ohm

I assume I will need some kind of voltage/impedance matching between
the two units.

Al Moodie.
There are several issues.

 First of all, do not use the phono input; it is designed for a
magnetic cartridge, has RIAA equilization, and will seriously
overamplify the bass frequencies.

 Second, I would spend some time reading the manual for the TV, and
studying the function of the audio output RCA jacks.  If they can be
configured to suit your purposes, they would be preferable to the
headphone jack.

 Third, you are setting up a situation where the TV will be turned
off, but the amplifier will still be on.  For a number of reasons,
this is not desirable.

PlainBill

My AV amp stays on all the time, and it doesn't cause me any problems ...

Arfa

I got a couple pseudo theater amps that shut down with no input. I
also think some active subwoofers also shut Down.

Greg

 

[Arfa Daily]

"GS" <zekor@comcast.net> wrote in message
news:763bc8c2-4d1b-4913-8a2a-d9d2fd322e4c@t5g2000yqj.googlegroups.com...

On Jul 26, 9:41 pm, "Arfa Daily" <arfa.da...@ntlworld.com> wrote:
PlainB...@yawhoo.com> wrote in message

news:nplo2719lrg5jpaghg40ltl8o8bekcb42c@4ax.com...





On Sun, 24 Jul 2011 10:15:13 -0400, Al Moodie <nos...@nospam.com
wrote:

Hi,

Not sure if this is the correct forum, but it is the only one I am
familiar with.

I have an old audio system, Technics SU 8022 stereo amp attached to
large quaulity technics speakers, works fine.
Have a Sony Bravia LCD TV which has an audio output socket which I use
for headphones occasionally.
Does it make sense to attempt to connect the TV's audio output to the
Technics amp to get better sound quality.

Sony TV Audio out:
500mVrms (100% modulation)
More than 1 Vrms at max volume setting
Impedance 47k ohms

Technics amp input:
Phono 2.5mV 47k ohm
Aux 150mV 27k ohm

I assume I will need some kind of voltage/impedance matching between
the two units.

Al Moodie.
There are several issues.

First of all, do not use the phono input; it is designed for a
magnetic cartridge, has RIAA equilization, and will seriously
overamplify the bass frequencies.

Second, I would spend some time reading the manual for the TV, and
studying the function of the audio output RCA jacks. If they can be
configured to suit your purposes, they would be preferable to the
headphone jack.

Third, you are setting up a situation where the TV will be turned
off, but the amplifier will still be on. For a number of reasons,
this is not desirable.

PlainBill

My AV amp stays on all the time, and it doesn't cause me any problems ...

Arfa

I got a couple pseudo theater amps that shut down with no input. I
also think some active subwoofers also shut Down.

Greg

Mine, however, is a 5.1 Sony home cinema amp with built in DVD (that I don't
use), and remains fully powered with or without input. I am, however, fully
familiar with the types that do shut down. I have repaired two in the last
three weeks.

Arfa