If one wants to measure the speaker alone without the room, you limit the listening time on the mic in the software. So the software sends out an accoustic signal and you can set in milliseconds how long after that it's allowed to measure. In the impulse response window in REW you see the pulse from the speaker, a quiet part, and then new ripples. The new ripples are the echo and should be cut out by adjusting the listening window. Then you measure only the speaker from ca above 800Hz and upwards. Then you get a baseline for further tweaks. Its an awesome tool and lets you understand whats going on much better. Going only by ear is almost impossible/very slow compared an spl graph and waterplots. I highly recommed you start with some guides to get started with eiter REW or ARTA. Its going to help you achive the sound you want much faster 
There is some decent REW info on Youtube which is enough to get you started!
There is some decent REW info on Youtube which is enough to get you started!
Another approach to this is to forget about impulse response for the moment, and just do a 1/3 octave RTA measurement with pink noise. It's perfectly valid for the issues at hand, and the way most people used to do in-room measurements and adjustment.
No one starts off an expert at all this stuff. Trying to learn multiple pieces of software simultaneously while also understanding the nuances of quasi-anechoic measurement and DSP hardware isn't a piece of cake. In many cases, acquiring the hardware/software is easier these days than acquiring the knowledge of how they work; the exact opposite of what it used to be. In ye olden times, you lusted after hardware and software to measure for years before the purchase made sense, so the ideas were pretty well ingrained before you had to do an actual measurement.
No one starts off an expert at all this stuff. Trying to learn multiple pieces of software simultaneously while also understanding the nuances of quasi-anechoic measurement and DSP hardware isn't a piece of cake. In many cases, acquiring the hardware/software is easier these days than acquiring the knowledge of how they work; the exact opposite of what it used to be. In ye olden times, you lusted after hardware and software to measure for years before the purchase made sense, so the ideas were pretty well ingrained before you had to do an actual measurement.
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