Background:

I'm looking to clean up my audio/media/CD collection setup. I also need to
make it more wife friendly. Currently I use a Pioneer amp (recent monolithic
module based, not original) into IPL transmission line speakers and I route
various inputs through it via the built-in input selector. As a 'mature'
person my hearing is OK 'for my age' but if I'm honest with myself I find
that I can't really distinguish between uncompressed and MP3 compressed
material...with a few exceptions. That is why I'm looking at a MP3 based
storage solution. I'm after opinions before I go ahead and make some
changes.

Questions:

The built in Brennan amp uses Monolithic Power MP7782 units. In the interest
of reducing clutter I'm looking to use this as my main amplifier. It seems
to that these days all amplifiers are 'created equal' and audio quality it
will be at least as 'good' as my existing Pioneer amp. Right ? If not then
why not ?

The Brennan amp only has one external input. I plan to common up source line
level outputs via a passive summing network and switch the sources as
required instead (PVR, TV etc.) In the interest of clutter reduction and
ease of use I would prefer this to a switch box. There will be 2 (maybe 3)
sources and so a simple Y-network will suffice. Yes ? Resistor values ?
Around 470R in each arm ?

Comments please ?

In article , TonyL
wrote:
Background:

As a 'mature' person my hearing is OK 'for my age' but if I'm honest
with myself I find that I can't really distinguish between uncompressed
and MP3 compressed material...with a few exceptions. That is why I'm
looking at a MP3 based storage solution. I'm after opinions before I go
ahead and make some changes.

Questions:

The built in Brennan amp uses Monolithic Power MP7782 units. In the
interest of reducing clutter I'm looking to use this as my main
amplifier. It seems to that these days all amplifiers are 'created
equal' and audio quality it will be at least as 'good' as my existing
Pioneer amp. Right ? If not then why not ?

That depends on your hearing and requirements.

If what you say about MP3 is as true as you say, then I doubt you will be
too concerned about amp 'quality' - although I have no idea how well the
amps in the 'Brennan' are implimented. Alas, simply quoting a part number
doesn't tell us anything about, say, it being driven using a PSU with
adequate headroom in voltage and current terms for a specific use. That
will depend on your speakers (impedance and sensitivity), room size, and
listening preferences. e.g. if you need higher levels now (or in future) if
your hearing deteriorates, you may want more power - or just to use
headphones.

BTW IIUC the 'Brennan' can also save as LPCM. So I'd recommend using that
if the HD has enough space. Otherwise you may regret the reduction to MP3
later on.

The Brennan amp only has one external input. I plan to common up source
line level outputs via a passive summing network and switch the sources
as required instead (PVR, TV etc.) In the interest of clutter reduction
and ease of use I would prefer this to a switch box. There will be 2
(maybe 3) sources and so a simple Y-network will suffice. Yes ?
Resistor values ? Around 470R in each arm ?

Again that depends on the sources. In past decades the standard was that a
source should happily drive a 10k load. And you need a lower impedance than
that presented to an amp input to avoid problems like high noise or
bandwidth rolloff. So I would not personally choose to let any source see
less than 10k - unless it is specced for something lower. And I'd keep the
source presented to the amp to below 1k - preferrably more like 470R max.

Using 10k series resistors for each source and a 470k shunt means a
noticable drop in level. If that is OK with you, fair enough. But CPC and
others flog simple switch-boxes that work fine if you and your other half
can cope with a single selector switch, and avoid this problem. Your
choice.

Slainte,

Jim

--
Please use the address on the audiomisc page if you wish to email me.
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc http://www.audiomisc.co.uk/index.html

Jim Lesurf wrote:

Using 10k series resistors for each source and a 470k shunt means a
noticable drop in level. If that is OK with you, fair enough. But CPC
and others flog simple switch-boxes that work fine if you and your
other half can cope with a single selector switch, and avoid this
problem. Your choice.


Thanks Jim. Your comments noted, particularly regarding the summing
insertion loss and impedance issues.

We can both 'cope' with a selector switch and that is what we do now. We
also have to select video source via an HDMI selector switch since our TV
only has 1 HDMI input and our so-called 'intellegent video router' turned
out to be rather dumb. This, plus 4 different remote control units, is less
convenient than I would like and certainly not what my wife wants. Progress,
huh ?

I just went back to the Bremmer site and see that most units are 400+
pounds. I recalled them as being around 300 pounds ( faulty memory also
comes with aging ? ) so I'm going to stick with the present clutter for a
while.

Cheers
TonyL

"Jim Lesurf" wrote in message
...

Using 10k series resistors for each source and a 470k shunt means a
noticable drop in level.

Only about 0.2 dB, which very few if any can reliably hear in a direct,
close comparison. Nobody notices such things in casual use. A 47k series
resistor would be required for a ca. 1 dB drop, which is actually be just
noticable to many.

In article , Arny
Krueger
wrote:
"Jim Lesurf" wrote in message
...

Using 10k series resistors for each source and a 470k shunt means a
noticable drop in level.

Only about 0.2 dB, which very few if any can reliably hear in a direct,
close comparison.

Apologies. The above was a typo on my part. The OP asked about a 470R not a
470k. I thought I'd typed 470R.

Slainte,

Jim

--
Please use the address on the audiomisc page if you wish to email me.
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc http://www.audiomisc.co.uk/index.html

Jim Lesurf wrote:

Apologies. The above was a typo on my part. The OP asked about a 470R
not a 470k. I thought I'd typed 470R.


Jim,

I mentally corrected the typo and read it as 470R without even noticing
until Arny pointed it out.

KR

TonyL

There was a long discussion thread on the Gramophone forum about the
Brennan, but this has been 'temporarily' removed.
It was generally critical of the machine, the sound quality was not
judged to be satisfactory by some but another gripe was the way that the
machine files music, especially classical music.
The thread may come back- it's worth a look.

http://www.gramophone.co.uk/forum/au...ideo-equipment
--
Roger Thorpe

Standing on a golf course, dressed in PVC.....

I realise this is not up to the high level of intellectual debate normally
found in this group, but taking the name of the NG literally....

It's going to take me for ever to set up the main system in my new-ish
abode, but in the meantime I would like to listen to some of my CDs. The
obvious route would seem to be a portable walkman-type CD player. A Google
search is bewildering - I really don't think I want Digital Bass Enhancement
and all the rest of the techno-babble which the marketing chaps or chapesses
think will appeal to the kids. I assume all the transports will be the
same - probably by the same manufacturer?

So - the requirements (for a single, elderly boke living alone) a must
have a mains adaptor; I really don't want to mess around changing
batteries. Not interested in shock resistance - I don't do jogging. The
ability to change earphones - not sure I can cope with in-ear ones normally
supplied; when I've tried them they keep falling out. So - supplementary
question - any suggestions for outside-ear phones?

These devices all seem to be as cheap as chips, about £30 median, but it's
very difficult to find out the basics. Which one does what I want, and I
really don't care what goodies come with?

Thanks, all.

Geoff

test

"TonyL" wrote in message ...

Background:

I'm looking to clean up my audio/media/CD collection setup. I also need to
make it more wife friendly. Currently I use a Pioneer amp (recent monolithic
module based, not original) into IPL transmission line speakers and I route
various inputs through it via the built-in input selector. As a 'mature'
person my hearing is OK 'for my age' but if I'm honest with myself I find
that I can't really distinguish between uncompressed and MP3 compressed
material...with a few exceptions. That is why I'm looking at a MP3 based
storage solution. I'm after opinions before I go ahead and make some
changes.

Questions:

The built in Brennan amp uses Monolithic Power MP7782 units. In the interest
of reducing clutter I'm looking to use this as my main amplifier. It seems
to that these days all amplifiers are 'created equal' and audio quality it
will be at least as 'good' as my existing Pioneer amp. Right ? If not then
why not ?

The Brennan amp only has one external input. I plan to common up source line
level outputs via a passive summing network and switch the sources as
required instead (PVR, TV etc.) In the interest of clutter reduction and
ease of use I would prefer this to a switch box. There will be 2 (maybe 3)
sources and so a simple Y-network will suffice. Yes ? Resistor values ?
Around 470R in each arm ?

Comments please ?

Geoff Mackenzie wrote:
test

"TonyL" wrote in message
...
Background:

I'm looking to clean up my audio/media/CD collection setup. I also
need to make it more wife friendly. Currently I use a Pioneer amp
(recent monolithic module based, not original) into IPL transmission
line speakers and I route various inputs through it via the built-in
input selector. As a 'mature' person my hearing is OK 'for my age'
but if I'm honest with myself I find that I can't really distinguish
between uncompressed and MP3 compressed material...with a few
exceptions. That is why I'm looking at a MP3 based storage solution.
I'm after opinions before I go ahead and make some changes.

Questions:

The built in Brennan amp uses Monolithic Power MP7782 units. In the
interest of reducing clutter I'm looking to use this as my main
amplifier. It seems to that these days all amplifiers are 'created
equal' and audio quality it will be at least as 'good' as my existing
Pioneer amp. Right ? If not then why not ?

The Brennan amp only has one external input. I plan to common up
source line level outputs via a passive summing network and switch
the sources as required instead (PVR, TV etc.) In the interest of
clutter reduction and ease of use I would prefer this to a switch
box. There will be 2 (maybe 3) sources and so a simple Y-network will
suffice. Yes ? Resistor values ? Around 470R in each arm ?

Comments please ?

Geoff,

Your test using an old post from me seemed OK lol!

To reply to my own comments, I ended up with a zero (extra) cost system
using existing boxes. I send output from a blu-ray player to one of my
Pioneer amp inputs and then into my IPL TL speakers.

My blu-ray player happened to have WLAN streaming so for input I stream over
this from Windows Media Player. This program is also a DNLA network server
and has many, many useful features...much more than a Brennan. It obviously
supports auto rip from CD to MP3 and several other un/compressed formats.
Each CD typically takes a few minutes to rip. Music storage is on one of my
terabyte drives which is fully backed up elsewhere on the LAN.

So, I didn't end up with simpler hardware but I used existing hardware at
zero cost to achieve rather more than is possible with a Brennan box costing
significant £££

Cheers,

TonyL