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Speaker upgrade, how significant?
Speaker upgrade, how significant?
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Old 10th September 2021, 08:46 AM   #21
johnmath is offline johnmath  Australia
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Quote:
Originally Posted by planet10 View Post
Here the Forte III which would be considered ugluy if your amp is an ACA.
Ouch! No matter how flat that speaker is on axis, the impedance curve is in part a reflection of the total power response, which in turn is related to how a speaker will sound in a room (as opposed to an anechoic chamber).

I can hear ugliness just looking at the impedance curve, and it comes with an equally ugly time domain performance and spectral decay.

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Old 10th September 2021, 09:19 AM   #22
5th element is offline 5th element  United Kingdom
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The Forte III uses midrange and treble compression drivers. The impedance plot follows what you'd expect. The same is true for the impulse response given the path differences between the associated drivers on their respective horns. Neither of those metrics, however, would indicate a speaker that's going to sound bad unless you were going to connect them to an amplifier with high output impedance.

What does give major cause for concern is the wonky frequency response and uneven off-axis response. In this regard the 600M is miles better. Then again if these are paired with an amplifier with high output impedance all bets are off as to what the frequency response looks like now.
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Old 10th September 2021, 09:46 AM   #23
johnmath is offline johnmath  Australia
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Originally Posted by 5th element View Post
Neither of those metrics, however, would indicate a speaker that's going to sound bad ...
That's one of the most surprising ideas that I have heard, at least in the context of a a loudspeakers ability to reproduce the electrical signal inputted into a reasonable facsimile of the original recording, in five decades of working professionally in sound reproduction. Of course if a listener doesn't desire or expect a loudspeaker to reproduce sound that approximates the recorded source inputed into its terminals, then all bets are off.

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Old 10th September 2021, 01:36 PM   #24
Pano is offline Pano  United States
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Speaker upgrade, how significant?
Johnmath - are you sure that your read the 5th element correctly? Although I understand your point, I think you missed part of the post just above yours.

But then, I've only been in pro audio for 4.5 decades, so maybe I'm also missing something.
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Old 10th September 2021, 04:56 PM   #25
planet10 is offline planet10  Canada
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Speaker upgrade, how significant?
Quote:
Originally Posted by Evenharmonics View Post
I accepted it as a speculation.
Based on solid prior evidence. Go look at the FR of any amplifier with highist Rout on the simulated complex load one can get a very good idea how big the effect is.

Everharmincs has always seemed to lean on measurements… here that we have (mosty) measurements guiding the answer, he wants a listening test. Guess one can never be right?

Here the FR of an amp with similar Rout to the stereo ACA.

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Old 10th September 2021, 04:59 PM   #26
planet10 is offline planet10  Canada
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Speaker upgrade, how significant?
Quote:
Originally Posted by johnmath View Post
...the impedance curve is in part a reflection of the total power response...
I do not think that is the case at all. — at least as expressed.

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Old 10th September 2021, 05:03 PM   #27
planet10 is offline planet10  Canada
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Speaker upgrade, how significant?
Quote:
Originally Posted by 5th element View Post
Neither of those metrics, however, would indicate a speaker that's going to sound bad unless you were going to connect them to an amplifier with high output impedance.
Which is what the OP has.

Quote:
Originally Posted by Mulburg View Post
...an ACA 1.8...
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Old 10th September 2021, 06:07 PM   #28
Evenharmonics is offline Evenharmonics  United States
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Quote:
Originally Posted by planet10 View Post
Everharmincs has always seemed to lean on measurements… here that we have (mosty) measurements guiding the answer, he wants a listening test. Guess one can never be right?
Only in your own perception, which happens to misguided. I've always advocated listening to speakers when making purchasing decision.

After all these years, still no example of lots of audible sound that can't be measured?
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Old 10th September 2021, 06:17 PM   #29
AllenB is offline AllenB  Australia
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Speaker upgrade, how significant?
Showing the Forte III example with a selection of Zo. Red with 0.25 ohms, in a system without defects this magnitude of variations might be audible.. Blue with 3 ohms, attainable and less likely not to be heard.

What is it exactly that we're supposed to be showing?
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Old 10th September 2021, 07:57 PM   #30
Evenharmonics is offline Evenharmonics  United States
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Quote:
Originally Posted by AllenB View Post
What is it exactly that we're supposed to be showing?
To be picky, Klipsch Forte IV, not III.
Quote:
Originally Posted by Mulburg View Post
would swapping in a pair of Klipsch Forte IVs make a substantial difference?
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