**Although ES-sigma is a made-to-order product but from time to time we have stock for sale,using different lambda drivers**
** contact us before purchase recommended. **
ES-sigma enable user to enjoy the speaker-like sound of this legendary model without having to be troubled by the availability, high price, service issues and driver deterioration problem which are common on the original sigma. ES-sigma uses a pair of 404 driver with has a higher resolution, imaging and transparency than the original sigma.