Why did you opt to order to Lyra Atlas Lamba SL, instead of the regular Lyra Atlas Lambda?
Here is what Lyra says about the SL model:
This is a special, built-to-order, version of Atlas for expert users with very high-gain, extra low noise phono stages, or alternatively a step-up transformer designed for phono cartridges of 2 - 3 ohms or less.
Most users (and phono stages) will benefit from the regular Atlas with much higher output and considerably more energy; resulting in a much better signal-to-noise ratio. If you are in doubt about which version of Atlas that will work best in your system, please go with the regular Atlas.
The Atlas SL may provide extra pure and pristine sound from an audio system that is optimized for a low-impedance, low-output cartridge. However, this may be accompanied with a lesser level of energy and power.
Lyra nevertheless has decided to offer SL models, as built-to-order at a 10% surcharge, for those who are confident that they can extract the benefits from such a low-output MC phono cartridge.