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With the ES Lab EHT-7, there's no need to buy a separate electrostatic headphones amplifier.
Your existing speaker amplifier will work perfectly, and the EHT-7 will provide the bias voltage (580V) to the stators of the ES-2a headphones.
The EHT-7 is completely transparent and will not add any coloration to the sound of your amplifier.
The ES-2a headphones will therefore be amplified by the sound of your amplifier without any degradation.
ES Lab ES-2a headphones : https://www.headphones-absolute.com/shop/p/es-lab-es-2a
ES Lab EHT-7 Energizer : https://www.headphones-absolute.com/shop/p/es-lab-eht-7