Running on just the drivers

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So I have a breadboard setup that has a simple power amp running on 18 volt rails. The speakers I am using are some Yamaha desktop speakers that according to the internet are supposed to be 6 ohms. They saound decent enough for my purposes. To make matters more challenging, I am running them in parallel. (I only have one channel built, so both speakers are running in parallel on that channel). So I am running into 3 ohms, which I realize is a difficult load.

Anyway, I was poking around and inadvertently knocked the wire oiut of the breadboard that connected the lower output transistor's collector to the -rail. I was surprised that there really wasn't an audible increase in distortion. Curious, I put it back and tried the same with the upper transistor, with the same result.

So basically I was listening to the drivers. As the driver in play heated up, distortion did start to become obvious. I didn't get a chance to really scrutinize the sound for the brief period the that the drivers were cool enough to sound good, so its possible there was distortion there that I didn't notice. I guess I was surprised that the suddenly heavier VAS load didn't cause more audible distortion.

Any thoughts? I'm still pretty new at this so I guess I am just sharing an experience that had results I hadn't expected. Is NFB that powerful that it fixed the problem that well?

The drivers are mje 340/50 by the way
 
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