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DEXA Technologies ApS
Christiansgade 1
DK7500 Holstebro
Denmark
VAT no 27966020
tel +45 31139101
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Discrete OPAMP's
This module is intended as a way to upgrade your CD or DVD player or amplifier, by removing the existing OPAMP's and dropping these into the motherboard. It is a cheap, but very effective upgrade to sound quality, and can be performed on high-end as well as midrange models.
By start of 2010 we introduced these new discrete OPAMP's. Most signal sources, and many power amplifiers use operational amplifiers, as main active component, as amplifying, filtering and impedance conditioning of the audio signal. This means the audio properties of these OPAMPs have a powerful effect on the sound of your audio appliance. Even OPAMP's with good data, like very low THD specification still have very different sonic properties. This tells us that technical spec is not a defining factor for sound quality.
Classically there has been a few IC OPAMP's considered good for Audio, and with golden qualities. But today it is in debate if even these very expensive chips are really capable of getting the best sound out of your CD player, DVD player, preamplifier or power amplifier. And when you add the fact that most commercial audio players use cheap OPAMP's and not the classical 'golden' OPAMP's that would cost hundreds of times more, there is place for improvement.
This discrete OPAMP is based on a novel 12 transistor circuit with very high linearity. Therefore low open loop amplification is possible, leading to natural, relaxed sound with a very high detail and perfect tonal balance.
The circuit implies current mirrors, which are here implemented with ulra low noise green LED's. This gives the amplifier very good low noise performance.
The input stage is bipolar unlike some other discrete OPAMP's available on the market. This gives our module the best possible stability under all real-life uses, and also protects it better against static electricity. Bipolar transistors also tend to sound cleaner and more dynamic than FET's in the input stage.
Click!
In this CD player the space between the modules
was a bit tight, so we added sticky paper between
the modules to ensure they couldn't short out. It
sounded absolutely outstanding!
In line with our CD upgrade components we launched a high end discrete analog OP-Amp module in January 2010. It will drop directly into DIP8 single or dual footprints in a CD, DVD, Preamp or soundcard. It's based on brand new technology, which will provide world class sound performance in your existing product. Compared to other existing products this module is made with low inductance non magnetic components, and a special high-speed circuit with extremely low THD (0.0003%). Current mirrors are made with lowest noise LED references. Resulting in a clean and coherent sound experience, with complete 'black background'.
Click!
In this SONY player the modules simply drop in, the
upgrade takes only 15 minutes, and gives a dramatic
improvement in resolution and clarity, even if it's
only a midrange CD player.
This new OP-Amp module is drop-in compatible with NE5532, AD712, NJM2110, AD8620, MC4558, OP275, OPA2604 etc for duals and NE5534, AD711, AD8610, OPA604 etc. for singles.
With a reference Clock and a couple of voltage regulators this is the cheapest way to achieve true high-end sound performance, even from mid range audio equipment.
The DX discrete OPAMP is extremely fast, and this normally means you have to be very careful with decoupling the supply rails. Therefore we placed pads for mounting optional decoupling caps on the module itself, in case some CD players had poor decoupling on the motherboard.
However our real life tests now show, that because of the relative low open loop gain, the OPAMP is stable even with very poor decoupling. With up to 60 cm of wire between the module and the nearest decoupling cap, it's still stable.
That lead us to a decision to remove the local decoupling caps in the next production batch, in order to free up 8mm of space on height above the motherboard. Should you wish to add local decoupling caps, this is still possible by placing them under the motherboard.
| Test product for 30 days in your own system. Full money back warranty... |
Just how effective is an upgrade with these discrete OPAMPS?
We did some listening tests, we bought a 100 $ used CD player from the newspaper, and listened to it, compared it with our lab 1000 $ reasonably new CD player, and also a brand new 5000 $ reference player. Then we upgraded the 100 $ CD player with 2 dual OPAMP modules (total cost less than 200 $), and then compared again. The 100 $ player upgarded is what you see on the photo above, with only 2 OPAMP's mounted.
The results of the upgrade in terms of sound quality is shown below. The 100 $ player went from being the worst sounding source, to getting pretty close to the 5000 $ player in every aspect. The difference in sound quality was hardly noticable from the now 300 $ player up to the 5000 $ brand new high-end model.
We did not upgrade the 100 $ player with a clock as well, but if we had done that it would most probably sound even better than the 5000 $ player, as it was already getting pretty close with just the OPAMP's.
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Lars, Stockholm
I have earlier upgraded my Yamaha CDX993 with the D-clock, which was a great improvement, see my feedback on the D-clock. The discrete op-amps give a further improvement. The music is delivered with a fantastic clarity and detail. I am very satisfied with this upgrade.
/ Lars, Stockholm
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