sreten said:note : we are talking about the 1/3 octave averaged
response in-room averaged over a number of various
listening positions, not a single in-room measurement.
i.e. averaged in-room response, not in-room response.
/sreten.
I understand all that. The technique is most useful for understanding low frequency performance in a particular room. That why it is necessary to take measurements many places to avg out the effect of room modes. This is were all the differences will be in comparison to anechoic measurement.
My understanding is that at HF the 2 techniques will be in very close in agreement (in shape at least) given the limited number of data points for the 1/3 octave avg. Repeating the question again. You said the there is a HF roll off associated with this method, correct?
What is so difficult to understand ?
Take a loudspeaker with a flat axial response and a dome tweeter.
(And no aberrent off axis behaviour)
Put a pair in a room in typical placement positions.
Seperately measure the left and right 1/3 octave responses at a
number of listening positions, say 10, then average the 20 results.
The top octaves will smoothly rolloff. If they don't this indicates
the axial response is not flat, it rises towards the top octaves.
(Or there is aberrent off axis behaviour)
Its obvious to me, and therefore common / accepted knowledge.
(edit : it was also repeatedly stated in articles using averaged in-
room responses that the top octaves should smoothly roll-off)
/sreten.
Take a loudspeaker with a flat axial response and a dome tweeter.
(And no aberrent off axis behaviour)
Put a pair in a room in typical placement positions.
Seperately measure the left and right 1/3 octave responses at a
number of listening positions, say 10, then average the 20 results.
The top octaves will smoothly rolloff. If they don't this indicates
the axial response is not flat, it rises towards the top octaves.
(Or there is aberrent off axis behaviour)
Its obvious to me, and therefore common / accepted knowledge.
(edit : it was also repeatedly stated in articles using averaged in-
room responses that the top octaves should smoothly roll-off)
/sreten.
Sreten, I thought you were an engineer. Repeating the same thing does not make it a fact. I was asking WHY with tech details. We know the speaker and the test conditions so generalities are not useful here. If you don't know then that's ok too. I am getting a bad taste from this discourse so I'll drop it now.
Hmmm........
Seems one tongue in cheek comment about "us Brits"
(with some basis in fact) and every subsequent post is
seen as something that must be disagreed with by some.
KW thanks for your off the record mail - I appreciate you
taking the time to write such a comprehensive summation.
It started off as a simple statement that still is true, and
simply contradicting the veracity of this statement and the
veracity of subsequent statements I've made to back it up
seems to be entirely pointless, it doesn't change anything.
Infinia :
Your getting a bad taste from this discourse ?
Try comparing your posts to my responses.
/sreten.
Seems one tongue in cheek comment about "us Brits"
(with some basis in fact) and every subsequent post is
seen as something that must be disagreed with by some.
KW thanks for your off the record mail - I appreciate you
taking the time to write such a comprehensive summation.
It started off as a simple statement that still is true, and
simply contradicting the veracity of this statement and the
veracity of subsequent statements I've made to back it up
seems to be entirely pointless, it doesn't change anything.
Infinia :
Your getting a bad taste from this discourse ?
Try comparing your posts to my responses.
/sreten.
SY said:
Hi,
The roll-off is due to the high frequency dispersion characteristics,
so unless the speaker in question has exceptional high frequency
dispersion characteristics one would expect a similar roll-off for a
"neutrally balanced in room" loudspeaker.
For the above cases the interpretation of the averaged in-room
response needs to be careful, but in the examples I've seen that
are measured the averaged in-room response seems to be the
most useful in describing the percieved balance, compared to
the more typical axial and off axis response curves.
It is a pity they don't do more of the full averaged in room response
tests for speakers, presumably because it is very time consuming.
/sreten.
Sreten says something very intuitive. Mix many off axis readings in a normal room and you get a gradually sloping down mean average for last 2 octaves. Well documeneted also.
As for mono/stereo speaker, if the author meant voiced for mono signals, he has a case for not being the proper voicing for stereo. Hence not best to be used in stereo pairs. Mix on a desk and you will absolutely get it. If he means other issues, I wait for reading interesting points too.
As for mono/stereo speaker, if the author meant voiced for mono signals, he has a case for not being the proper voicing for stereo. Hence not best to be used in stereo pairs. Mix on a desk and you will absolutely get it. If he means other issues, I wait for reading interesting points too.
tinitus said:
Hi,
I presume it means its very difficult to assess such things as
image stability when you move around, if apparent depth
varies with frequency etc listening to a single mono speaker.
TBH I've no idea what is an "ideal" mono speaker, a pair of good
stereo speakers fed a mono signal sound pretty good to me.
An example might be the original Quad ESL, designed as
a mono speaker. The "hotseat" for stereo is quite small,
perhaps for mono the beaming is much less an issue.
Did have a mono system once (well, put together for the school
common room) used a Decca 1/4 wave enclosure with an angled
rear facing driver, worked well, sounded "big". Can't imagine a
pair of them being too hot on stereo focus though.....
/sreten.
tinitus said:
Hi,
True, but assessed in Stereo, and designed towards off axis
performance etc where the expectation is its the best for stereo.
Take a design like the KEF 105 :
An externally hosted image should be here but it was not working when we last tested it.
Stereo performance is stunning, but used a single mono speaker ?
/sreten.
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.