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Review: Spectron Musician III Signature Edition Amplifier

Category: Amplifiers

This review is of the newly released Spectron Musician III "Signature Edition" MSRP $5995. The signature edition has improvements over the $4995 standard version (which is an exceptional amplifier as-is) that improve the specs and sound to the degree of making it a strong competitor to $20K-40K reference monoblocks. John Ulrick (former co-founder of Infinity and creator of the first digital amp in 1974) has really outdone himself with this new design. The Musician III Signature version is one of the most natural, detailed, robust and transparent amplifiers I have ever had the pleasure of listening to. The soundstage is so vast that when I closed my eyes, my once constricted sounding listening room sounded like someone snuck into my new home and added an extra room behind the speakers! Ok, I may be exaggerating about the stage a little bit but not about the clarity, detail and bass authority. This amp is POWERFUL and difficult loads do not even phase it. I have MBL 111E Omnidirectional speakers connected to it. I originally focused my attention on the ship anchor sized MBL 9011 monoblocks and fell in love with them at CES 2005. The Spectron was purchased to be a temporary place holder until I could afford the MBL giants. After purchasing this tiny, less than 60 lb. digital powerhouse, I have no desire to shell out for Monoblocks that cost as much as my new BMW 5. Everyone recognizes that the new digital designs are powerful and efficient but there exists an industry wide stigma about the musicality of most digital designs. Many inexpensively or poorly implemented digital chip based designs simply do not have the warmth and natural sound of the finest tube and class A solid state amps. The Spectron Musician III Signature is in a category all by itself. I enjoy listening to cello and piano. I ran through about 2 hours of "The Essential Yo Yo Ma" and was shocked. The Spectron revealed nuances and micro details that I never noticed previously on tracks that I listen to frequently. The bass is robust, strong and very controlled. The Spectron sounds nothing like many of the digital ice-power or tripath based designs. The Spectron is very transparent. What comes out of it is exactly what you put into it. Use a great power cord and exceptional source equipment and you cannot lose with this amp. Other Spectron owners tell me that tube preamps such as BAT are a perfect companion for the Spectron. If you are considering purchasing a new amplifier in the $10000+ category, you owe it to yourself, and your wallet, to give the Musician III Signature a listen. Be sure to have a pair of well respected tube or solid state amps that cost at least twice as much in the same room for A/B comparison. You will be amazed! The manufacturer burns in the amps for a week or so at the factory and informed me that I need to give it at least a week of burn-in at home to fully appreciate it. After a few hours of warm up, right out of the box, it sounded great. I am on day 4 of listening and it just keeps getting better.

Strengths: Powerful, Open Soundstage, Critical Midrange is natural and dynamic. Nice build quality. Pretty Face

Weakness: No rack mount option at this time.

Associated gear
Theta CBIII w/Extreme DACS running 2ch
Underwood Modded Denon 3910
MBL 111E Omnidirectional Speakers
PS Audio Duet
Mr.Cable Musician Power Cord

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dob
577 posts
 
Hello Guido.
This amp has true balanced input where two signals with oppose phases are carried. The signals summated and further processing is done in single ended mode. I am not familiar with any class D amplifier which work in balanced configuration in similar fashion to linear amps and this is because, theoretically at least, there is almost no advantage to do so in this class.
Hope it helps.
Rafael
guidocorona
4,298 posts
 
Spoke today to Jeff at JRDG. Apparently the 312 amp is balanced both at the input and the output, while my old JRDG 7M has balanced input but a single ended output, with one of the two conductors in the speaker wire acting purely as ground. I am not sure if the Spectron Sig has balanced output. Admittedly, ultimately it may not matter. Our ears are the ultimate judges--hopefully independent from stated technology/looks/etc. . .--and I have not aA/Bd the two devices.
simontju
257 posts
 
Hello Guido,

Is Rowald 312 class D amp?

If so that would be first true balanced class D amp on the market. THE question is why????

Having TRUE balanced inout as Spectron does means that you take both halfs of the signal from both phases and then sum them and in the process you reject some noise and hum. Its great. Today, I learned, form user "Molly" that combo REX preamp by BAT with Spectron dramatically improves quality of the sound when he used balanced output of RX, balanced interconnect and balanced inout of Spectron.

OK, after you summated your signal you process it as FM radio does - pulse width modulation and I do not see any (well almost) advantage to continue it in both phases. There is large number of potential pitfalls in such process. You can do it for marketing purposes but regarding the noise or signal you have no advantage and you can pay price (almost ceratin in group delay consistency). You never heard of balanced FM tuners, aren't you? The same reason.

On the contrary, in linear amplifiers, the balanced signal path continues to benefit sound - IF (IF!) some conditions are met and we will not go there.

Hope it helps.

Simon
guidocorona
4,298 posts
 
Thank you Simon. Yes Jeff Rowland Design uses the ICE chips. JRDG 312 has been designed as fully balanced because Mr. Rowland judged that an optimal and true fully balanced topology benefits the sonic properties of all his designs, including his newest class D implementations. If you call him, he can give you all the details.
simontju
257 posts
 
Hello Guido,

OK, lets see what's are results: by using two ICE modules you can reduce your noise by square root of two or 41%. Sounds great but if your signal is about 110 dB and noise is 1 dB (barely audible and in most amps it is less) then it became 0.6 dB almost negligible difference. Also, your level of distortion will be lowered somewhat (say instead of 0.03% it becomes 0.02% - again, hardly noticeable)

Since ICE modules are produced in mass quantities they are inexpensive and I believe that Me. Rowland can justify their use in balanced mode with almost no positive results.
On the contrary, custom in-house build modules by John Ulrick or Bruno Putzeys are very expensive and instead of spending money to double cost of the digital modules they use this money in much more effective ways, say improving power supplies, output filter, RF filtering (enormously important in class D amps) etc etc etc. On other hand, when cheap modules are used the balanced operation is beneficial for marketing reasons mostly, I believe.
All The Best
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