Hi Amit,
Thank you for your inquiry! We are sorry but the HT-A7000 does not have a dedicated microphone input. We do offer speakers that have a mic function and designed for Karaoke use such as SRS-XV900, SRSXV800, SRS-XP700, or SRS-XP500. For more information about our products, please visit our Sony Electronics website.
Additional information:
The HT-A7000 features our premium audio technologies such as Vertical Surround Engine and S-Force Pro Front Surround, you feel like you are not only in a sphere of sound, but inside the movie itself. To ensure that you will be getting the most out of the HT-A7000, toggle on the "Immersive AE" remote button to upscale the entire audio system's performance. Additionally, make sure to run Sound Field Optimization so that the soundbar can calibrate its performance to your environment, and that it sounds like it was engineered to be in your room. If you want to expand your audio system, please take a look at our optional subwoofer and rears accessories (SA-SW5,SA-SW3,SA-RS3S).
Hope this helps! - Kris