an image to enlarge.
“…Electronics have their lowest
distortion and optimum performance at a specific design voltage.
If the voltage varies, the amplifier's performance will suffer.
An additional problem in amplifiers is that
they require bias to eliminate crossover notch distortion and
determine their class of operation. The bias will vary as the
voltage does, which will further reduce performance.
An amplifier's voltage will fluctuate wildly
as dynamic music is played. This causes the amplifier's distortion
and bias to vary constantly and fail to meet its full performance
As if all these problems are not enough,
as an amplifier's voltage sags under load, the power it can deliver
is greatly reduced. If the voltage would remain stable, the amplifier
could produce much more power. Since most audiophile speaker systems
require several hundred watts of power to avoid clipping and compression
of the dynamic range, power is extremely important.
All quality, line-level electronics use
voltage regulation in their power supplies to produce a stable
voltage, regardless of load or the mains voltage. Audiophiles
would not consider using a source component that did not have
regulated power supplies. So why use amplifiers with unregulated
The main problem is heat. Amplifiers operate
at much higher voltages and currents than line level source components.
These higher voltages and currents forces conventional regulator
designs to waste large amounts of energy, which wastes expensive
electricity and causes the amplifier to get very hot.
Also, many regulator designs radiate RF
(Radio Frequency) energy when switching high currents and voltages.
This RF gets into the amplifier's electronics and can cause instability,
oscillation, and noise. As a result of these problems, modern
power amplifiers do not use regulated power supplies and fail
to take advantage of the benefits available from doing so.
Sanders has solved these problems by developing
a voltage regulator that is essentially 100% efficient. There
is no heat dissipated by the regulator system. There is no high-power/high-voltage
switching that causes heat generation or RF problems.
The regulator in the Magtech amplifier maintains
a stable voltage regardless of load or reasonable changes in the
line voltage feeding the amplifier. It runs stone cold, produces
zero RF energy, and is simple and reliable.
Unlike other amplifiers, the distortion
in the Magtech amplifier is virtually unchanged regardless of
power level. The bias is stable regardless of load.
The regulator makes it possible to obtain
a 50% increase in power over the same amplifier operated unregulated.
In its stereo form, the Magtech will deliver 500 watts/channel
into an 8 ohm load and 900 watts/channel into a 4 ohm load…”
Sanders Sound Systems
Before placing my order with Sanders Sound Systems, I communicated
with Sanders Sound Systems representative ‘Josh’ (who
impressed me with modest confidence in their products and after
care service). I also shared my interest with MartinLogan electrostatic
speaker owners in the US via the MartinLogan Owner Group on Facebook
and received the following testimonial…
“After 30 years of listening to a lot of amps, I can
say that my Magtech is the best amp I have ever heard…”
Roland Plotzki (MartinLogan Owners Group)
Component external aesthetics?
Audiophiles who feel the need to compare the Sanders Sound
Systems Magtech Monoblock power amplifier and Preamplifier
external aesthetics against other high end components, may
come to the conclusion that the Sanders units are somewhat
bland? However, I am sure most ‘real’ audiophiles
will confess to actually prioritising substance over style?
For me, the Sanders Sound System units convey subtle high
quality style elements. The fact that these units do
not draw attention to themselves with items such as level
meters is actually a bonus. Occasionally my eyes do wonder
towards my turntable, CD player, then downwards at the compact
and solidly built Sanders Sound Systems Monoblocks and Preamplifier,
but at this level, you should know. The music is all that
With my head still settled comfortably against
my listening chair head rest, I began to reminisce on my journey
so far. It has taken over a year of extensive mental and physical
travel (to and from various retailers between Covid 19 restrictions).
Plus the extra expense in respect of the occasional dispatch
and return costs with other amplification that just
did not work out. Then there is the dreaded import duty cost
(for Sanders Sound Systems components).Injuries to my body
due to poor amplifier lifting technique, plus I’m sure
my hair has turned another shade of grey over the last year?
I still wondered. Have I reached the end of my amplifier
I set-out to explore
a few preselected vinyl and CD favourites.
With expectations high, Keith Jarrett’s
subtly tonally demanding and emotionally rich “Tribute”
vinyl album (featured in a few earlier experience reviews)
was the first to reach my ears. This recording features Jarrett’s
trademark ‘unique commanding colours on piano’
as well as Dejohnette’s dancing drum licks. I was hoping
to experience all the above characteristics clearly and precisely
placed within my modest MartinLogan Scenario and later, my
new MatinLogan Impression ESL 11A electrostatic speaker’s
soundstage. Thankfully, not only were the above characteristics
clearly evident this time, I was also offered a distinctly
more defined and immersive soundstage.
The above was
a great start and I was extremely pleased to have quickly
established the astounding musical dexterity and depth the
Sanders Magtech Monoblocks and Preamplifier had to offer,
time to explore further…
I normally compile experience reviews while actually listening
to music. This process always made perfect sense to me
as the inspiration, sentiment and energy is hopefully
conveyed into my words; however, on this occasion it was
impossible to multi-task as my ears were consistently
drawn into an almost living and breathing three dimensional
musical window. I was glued to my listening chair and
could only move to either change the vinyl album, or CD.
My preselected neatly arranged albums (set to one side)
eventually turned into a multi-pick ‘random search
through my main catalogue.’ My imagination was running
amok. I wanted to hear, feel experience everything in
my collection right now!
I eagerly plucked Charles Mingus’
“Mingus Ah Um” vinyl album from its slot in
my collection. As many jazz aficionados will know, Charles
Mingus was certainly a ‘character’ of many
shapes, tones and colours. Even today I am always a tad
reluctant to discuss, or even smile at the stories shared
about his short fuse (for example). I occasionally imagine
meeting various musicians ‘in the next life’
and considered Mingus might be one of them. I considered
he might be listening or watching me and could ‘misunderstand’
my thoughts and gestures?
Mingus’ multifaceted traits are
supremely evident within his eclectic compositions. I
have explored “Ah Um” through various other
forms of amplification in the past year and always felt
satisfied I was receiving all there was to offer from
my recent reissue. However, on this occasion I was astounded
at how much extra was on offer both musically and emotionally.
The precisely placed multi-layered instrumentation within
an expansive soundstage truly engulfed my senses. Mingus
is not listening and watching me. I sense that Mingus
and his band are performing right in front of me (Surely
nothing to be fearful of)?
On the first day alone I listened long into the early
hours of the morning. During the day I cranked the volume
up to over 70db without wincing or tiring at the supremely
controlled stunning musical montage these powerhouse
Monoblocks laid before me.
I believe even my non-music loving neighbours
will appreciate the refined attributes of these Monoblocks,
especially if it means they can sleep undisturbed at
2:00AM any day in the week?
The Sanders Magtech Monoblock power amplifiers and Preamplifier
unlocked previously hidden layers and textures within every
recording I explored (from either vinyl or CD format). I was
treated to one of the most lucid, sonically transparent and
organic musical presentations I have heard to date. At last,
I am able to indulge deeply within my music collection without
concern that the above presentation will alter in any way
due to fatigue when driving my electrostatic speakers. This
is exactly how it should be. I feel confident
to confirm, I have now reached the end of my amplifier search!
Magtech power amplifier
watts RMS into an 8 ohm load
2000 watts RMS into a 4 ohm load
DC through 100kHz
Class of Operation
100K unbalanced, 1K balanced
Input voltage required
for full output
Nore than 110dB below rated output
Less than 0.01%
Greater than 600 into an 8 ohm load
Voltage is user selectable for use world-wide.
Complete system details & configuration
AMG Viella V12 turntable with AMG Teatro MC & AMG reference
Phono stage & interconnect cables. Whest PS.40RDT Special
Edition phono stage
with Kimber Select KS-1116 XLR interconnect cable
Musical Fidelity A3 CD player (internally upgraded)
Van Den Hul The Second Analogue Interconnect cables
Sanders Sound Systems Magtech Monoblock power ampifiers x 2 and
Connected via Luminist Revision Poseidon XLR balanced cables
MartinLogan Scenario hybrid electrostatic speakers,
MartinLogan Impression ESL 11A hybrid electrostatic speakers with
Kimber 12TC speaker
Quadraspire Q4 EVO turntable wall bracket. Quadraspire Q4 EVO
4 tier shelf
Power & mains cables
Russ Andrews BMU 3000 for CD player, turntable & phonostage
Powerkord 300 mains cables for BMU, amplifiers, Preamplifier and
© Michael Valentine Studio
Use the links below to read the Sanders Sound Systems Magtech
Monoblock power amplifier
& Preamplifier Experience Review 1
or the Sanders Sound Systems logo to reach their website...