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Crown macro and studio reference amps: what's the secret of their slam ?
Crown macro and studio reference amps: what's the secret of their slam ?
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Old 6th October 2014, 02:52 PM   #1
elac310 is offline elac310  France
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Default Crown macro and studio reference amps: what's the secret of their slam ?

Crown amps that is at least the Studio Reference series (and the presumably identical Macrotech / Macro Reference) do have a particular pronounced, live-like and realistic slam / punch in the bass. Having had or tested several class A, AB, Mosfet, non mosfet amps, valve SET or PP etc. etc. I must say this bass is really particular. A friend of mine has made the same observation and he uses/has used a variety of amps including big audiophile US amplifiers. We both use large enclosures with 15" woofers (JBL Everest, Onken W-inspired cabinet) mono-amplified and passive equalized.

Let's forget a minute about the figures, especially the abnormal high damping factor. The explanation probably lies elsewhere and I'd like to hear those points of view. I also remember a guy back in the 1980s (before SR and Macrotech even existed I guess) who worked for a PA rental business and who always stated that the Crown / Amcron slam was something special.

Is anyone familiar enough with the topology specifics of these amps and able to explain what their secret is, or formulate a hypothesis ?
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Old 6th October 2014, 03:13 PM   #2
SY is offline SY  United States
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Crown macro and studio reference amps: what's the secret of their slam ?
Power and appearance.
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Old 6th October 2014, 03:32 PM   #3
scopeboy is offline scopeboy  Scotland
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They're also heavy so they make a wicked slam when you drop them on your toes.

Good solid-state amps have very low levels of distortion. So low that it is really hard to find any explanation for the subjective differences in sound that many people report.
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Old 6th October 2014, 08:05 PM   #4
elac310 is offline elac310  France
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Quote:
Originally Posted by SY View Post
Power and appearance.
The power does not come into play. Believe me. My loudspeaker system is much above 100 dB/1m/2,83V and the slam is there even at very reasonable levels (can't use much anyway except on classical and acoustical music recorded without compression).

Appearance: Hmmm. They don't look as provocative, excentric or "hi-endish" as many other amps. And at nearly 50, I need more to turn me on suggestively.
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CD player and preamp with E88CC stages, Crown SR1 amp, OnkenW Ciare PW388 + JBL2392/2490H + McCauley 9620 on C9090 Megaton horn (treble). Yes, a big 2" driver as a tweeter...Just love its realism.
 
Old 6th October 2014, 08:08 PM   #5
elac310 is offline elac310  France
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Quote:
Originally Posted by scopeboy View Post
They're also heavy so they make a wicked slam when you drop them on your toes.

Good solid-state amps have very low levels of distortion. So low that it is really hard to find any explanation for the subjective differences in sound that many people report.
Come on man...I'm sure we can come up with better explanations / theories.
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CD player and preamp with E88CC stages, Crown SR1 amp, OnkenW Ciare PW388 + JBL2392/2490H + McCauley 9620 on C9090 Megaton horn (treble). Yes, a big 2" driver as a tweeter...Just love its realism.
 
Old 6th October 2014, 08:09 PM   #6
MagicBox is offline MagicBox  Netherlands
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Good current capacity? (I don't know, wild guess as I don't know a thing about their supplies)
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Old 6th October 2014, 08:12 PM   #7
SY is offline SY  United States
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Crown macro and studio reference amps: what's the secret of their slam ?
Quote:
Originally Posted by elac310 View Post

Appearance: Hmmm. They don't look as provocative, excentric or "hi-endish" as many other amps.
But the appearance suggests power. You are by definition unaware of your subconscious reactions and biases.

Seriously, it's all suggestion.

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Originally Posted by MagicBox View Post
Good current capacity? (I don't know, wild guess as I don't know a thing about their supplies)
That's power, which elac has already dismissed.
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Old 6th October 2014, 08:17 PM   #8
elac310 is offline elac310  France
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Quote:
Originally Posted by MagicBox View Post
Good current capacity? (I don't know, wild guess as I don't know a thing about their supplies)
Maybe but not that much. There is a relatively big toroid transformer, the supply runs at about 100V (P=U^2/R) but the main caps are ridiculously small on the capacitance side, by audiophile standards (2x6800uF if I remember).
It's a class AB design, but clearly leaning more towards B than A.
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CD player and preamp with E88CC stages, Crown SR1 amp, OnkenW Ciare PW388 + JBL2392/2490H + McCauley 9620 on C9090 Megaton horn (treble). Yes, a big 2" driver as a tweeter...Just love its realism.
 
Old 6th October 2014, 08:24 PM   #9
greierasul is offline greierasul  Romania
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Maybe a small ground isolator resistor in the NFB, or maybe without that resistor.
 
Old 6th October 2014, 08:31 PM   #10
elac310 is offline elac310  France
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Quote:
Originally Posted by SY View Post
But the appearance suggests power. You are by definition unaware of your subconscious reactions and biases.

Seriously, it's all suggestion.
__________________
CD player and preamp with E88CC stages, Crown SR1 amp, OnkenW Ciare PW388 + JBL2392/2490H + McCauley 9620 on C9090 Megaton horn (treble). Yes, a big 2" driver as a tweeter...Just love its realism.
 

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