2x120W Mini Stereo Power Amplifier

I'm using this amplifier primarily for a cassette deck connected to powered speakers, as the speakers couldn't get very loud with the RCA cable straight from the deck. Bought one of these as open box for $30 and it has been the perfect boost to the sound that I needed. Unlike the newer model of it, this unit has volume dB meters, and there are several inputs for flexibility and potentially connecting multiple devices. Three RCA inputs, an RCA output labeled Recording, one 3.5mm aux input, a 1/4" microphone input, and finally, a 1/4" headphones output. I'm using that last option to connect to my powered speakers with an adapter to 3.5mm. I have Bluetooth capability with my powered speakers, and that already played quite loudly, so I haven't tested Bluetooth functionality on the amplifier. Newer models seem to reduce the number of corded input options and took away the volume meters, so that's why I stuck with this older model. One downside to this model is it does not come with remote, something I was aware of, but I'm happy using the tactile knob. What I do find strange is the knobs have a tactile middle-position where you'd assume they should be pointing straight up, but they're actually tilted a bit when they fall into that middle-position notch. My only grievance is now with my cassette deck as the meters on it read higher, or even max out during playback using the amplifier. I found this odd since my setup is deck -> amplifier -> speakers, and I didn't expect the deck would be affected. The deck doesn't have an output adjustment, but it's only for recording that I need to care about the levels on the deck, and I do have an adjustment knob for input recording level. Making up for the deck meters now being too sensitive, the PTA4 amplifier has its own volume meters, and those seem to work well during playback, though the amplifier's volume control has to be balanced with the volume control on the powered speakers to get the right dB readings. If you set a low volume on the speakers, you can crank up the amplifier volume dial and max out the amp's meters with ease. With the speakers set to a very high volume, you can also keep the amplifier volume very low to the point where the meters won't light up. Without powered speakers, I assume you'd need a deck with output level control to be able to "calibrate" the amp's level meter to match the deck, if the accuracy of these meters is important to you. I haven't yet tested non-powered-speakers to see how high or low those meters register when connected through speaker wire. If you're using a device where you can set the volume at the source, such as powered speakers or a mobile phone, then don't even worry about that.