Being class A/B im sure it will be north of 30k given its a balanced connection, but better to hear it from them, you could make a quick call to Emotiva as well
By coincidence, I had just emailed Emotiva support about this. I created an account just to get this info on the web. For what it's worth, I also expected the input impedance to be somewhere between 30-100,000 Ohms, but that's absolutely not the case. I sure do lover my Stealth 8s, though.
I hope this is helpful now and on down the road on the internets for someone.
Emotive Pro: Stealth 8 8” Powered Airmotiv Bi-Amplified Active Studio Monitor (Airmotiv 8 Stealth8)
Input impedance: 7000 Ohms (7k ohms 7kohms)
Input sensitivity: unknown, not available.
Email records:
#1.Date: March 15, 2019
From: Keith Levkoff, Technical Guru, Emotiva Audio Corporation
"The input impedance on the balanced inputs on the Stealth 8's is approximately 7k Ohms (per line)."
"Please note that, with line level signals, damping factor is not an issue."
#2.Date: March 18, 2019
From: Keith Levkoff, Technical Guru, Emotiva Audio Corporation
"There is always a slight design tradeoff between noise and impedance.
Lower impedance designs tend to be slightly quieter for various reasons.
This tends to be more likely to be true where long cable runs are involved - which is often the case with powered studio monitors.
The balanced outputs on most modern equipment are also quite capable of easily driving loads as low as a few kOhms.
Therefore, the engineer who designed the input circuitry for the Stealth 8's chose to go with a relatively low input impedance."
"Unfortunately, I simply don't have the specific numbers you're looking for.
We know that a pair of Stealth 8's can deliver about 115 dB SPL at one meter - and can do so with the output level delivered by the balanced outputs on most equipment.
However, I don't have any measurements that show the specific input level required to reach either that output level, or full clipping level on the amplifiers."
