Magnepan MG12/QR speakers are rated at 86dB with 4 ohm impedance. These are ribbon speakers and very complex loads for the amplifier. Your preferred amp Proton D1200 amp is rated 100W at 8 Ohms. You need a SS amp with plenty of power, I would say at least 400 W at 4 ohms before you can really determine if mass strings are a problem. Find a good dealer who can loan you a good amp with plenty of current and try that in your system first.
I understand issue with mass strings all too well. I think your problem is with the amplifier. Old Krell and McCormack amps can handle mass strings with ease. But they are not the only ones.
Good Luck!
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pwerahera:If you google PROTON D1200, you will see that it can deliver several hundred watts per channel. there is a tube demo showing how much power it is capable of. From the Owners manual at: https://www.hifiengine.com/manual_library/proton/d-1200.shtml Specifications:Rated power 100 W per channel at 8 Ohm Clipping power: 110 watts per channel into 8 Ohm (stereo), 175 W per channel at 4 Ohm and 220 W at 2 Ohm
But your speakers are not very efficient at 86 dB and has an impedance of 4 ohms. Hence, you need an amp that puts at least 400 W at 4 Ohms. Try an amp that can deliver 200 W at 8 Ohm, 400 W at 4 Ohm. Better if it can deliver 800 W at 2 Ohms.These are rated power, NOT clipping or dynamic power. |
the proton d1200 amp can produce 540w/1000w/1500w 20ms
'450w/650w/800w 100ms
'380w/500w/520w 200ms
'duty cycle
500ms dynamic headroom at 8,4,2ohms 7.3db 'should be
able to easily handle any crescendo that Beethoven,Mahler,or Orff can
dish out,n'est pas?
What's the difference between Continuous RMS and Dynamic Power ?
https://usa.yamaha.com/support/faq/audio_visual/2483.htmlMany people confuse these specifications, so I will try to give you a
simplified, non-technical explanation. Continuous RMS Power, is the spec
that really tells you how powerful an amplifier is. RMS power is
expressed in watts. A typical specification might read 100 watts RMS
into 8 ohms from 20Hz-20KHz at .01% THD. What this means, basically, is
that the amplifier will deliver 100 watts into an 8-ohm speaker from
20Hz to 20Khz? This frequency range is basically the entire audio range
that an individual can hear. The THD spec stands for Total Harmonic
Distortion: This is the amount of distortion the amplifier will
introduce into the original signal. Any high quality amp made today has
extremely low distortion ratings. The human ear cannot hear anything
under 2%. For the most part, when you are considering purchasing an
amplifier, you can disregard the THD specifications.
Dynamic Power, is a
little more difficult to understand. This is a test of the amplifier's
ability to go beyond its continuous RMS power for a very short time
period. We are not talking minutes or even seconds here. We are talking
milliseconds or thousandths of a second. A musical transient peak, such
as a cymbal crash lasts only a very short time. Dynamic power is usually
measured into 8 ohms, but specifications are generally also published
for 2, 4, and 6 ohm loads as well. To keep things from getting too
complicated, we will concentrate on the 8-ohm figures. To measure
dynamic power, an amplifier is fed a 1000 Hz signal for 20 milliseconds
then allowed to rest for 480 milliseconds. The amplifier volume control
is turned up until the amp reaches the clipping point. At that point,
the amp has reached its instantaneous peak or dynamic power output. Like
the continuous power rating, dynamic power is expressed in watts. The
figure is usually significantly larger than the RMS power rating, and
should not be confused with the continuous power ratings of the
amplifier. A dynamic power rating into a figure such as 1 or 2 ohms does
not mean that the amplifier can drive a speaker with a 1 or 2 ohm
rating continuously. If you attempt that, the amplifier will either go
into the protection mode or possibly cause damage.
PROTON D1200 continuous RMS power is 100 W at 8 ohms. This amplifier is NOT rated for RMS power at 4 Ohms which is the internal impedance of the
Magnepan MG12/QR
speakers. You got plenty of company to discuss for issues with mass violins. I am trying to give you a solution to at least minimize the problems related to reproducing mass violins in your system. |
