The SPL meter (when one uses a microphone with REW) is only used to set a rough 75dB level at the listening position. If you feel you can set a reasonable level for testing, the SPL meter is not required.
But, it sure is handy to have an SPL meter to set the relative speaker levels when running the receiver test tones test. Why would anyone not have an SPL meter?
Alright, point taken. Picked up an SPL meter yesterday...just posted my first response today. I'd appreciate if someone from the forum could take a look at my other post and let me know if it looks like I measured properly. Thanks!