OK – I’ve spent some time with my Radio Shack SPL meter, Behringer UCA202 external soundcard and REW to generate FR graphs of my subs. The REW online help thread at the 'shack is fantastic for an inexperienced REW user - like me. No way could I have gotten everything set up to measure without it.
I have an eD P7S-650 in the front of the room and two Infinity CSW10 in the back of the room. I measured the P7S separately from the CSW10. I measured the CSW10 together since they are basically co located about 3-4’ apart. There are pics of my room in my build thread, but I can post some here if it will help with analysis of the graphs. Now that I have the graphs, I have some questions and would like some impressions from those that are familiar with these graphs.
Here is a graph of the initial measurement of the P7S
Here is the graph of the P7S-650 with REW’s optimize pk gain and q
Here is the graph of the CSW10 with REW’s optimize pk gain and q
1. What do you think of the FR?
2. These graphs are telling me that I need to add equalization to remove the largest peaks, correct? But, do I need two eqs – one for the P7S and one for the CSW10?
3. I noticed the FR rolled off and then began to climb in both graphs so I extended the X-axis down to 2Hz. Here is the same graph of the initial P7S measurement down to 2Hz. The graph shows 104dB at 2Hz. What have I done wrong? Has this error compromised all of the measurements and do I need to start over?
4. I ran the sweeps with all of my speakers connected. Should I have turned off my L,C,R speakers as I could hear bass coming from them during the test. They are crossed at 80Hz.
5. I ran a measurement with all subs going but didn’t save a jpeg of it. Should I be attempting to measure all subs together or focus on measuring separately for the front and back of the room?
6. What adjustments/corrections should I make to measure everything correctly?
Thanks for the help.
kjlewie
I have an eD P7S-650 in the front of the room and two Infinity CSW10 in the back of the room. I measured the P7S separately from the CSW10. I measured the CSW10 together since they are basically co located about 3-4’ apart. There are pics of my room in my build thread, but I can post some here if it will help with analysis of the graphs. Now that I have the graphs, I have some questions and would like some impressions from those that are familiar with these graphs.
Here is a graph of the initial measurement of the P7S

Here is the graph of the P7S-650 with REW’s optimize pk gain and q

Here is the graph of the CSW10 with REW’s optimize pk gain and q

1. What do you think of the FR?
2. These graphs are telling me that I need to add equalization to remove the largest peaks, correct? But, do I need two eqs – one for the P7S and one for the CSW10?
3. I noticed the FR rolled off and then began to climb in both graphs so I extended the X-axis down to 2Hz. Here is the same graph of the initial P7S measurement down to 2Hz. The graph shows 104dB at 2Hz. What have I done wrong? Has this error compromised all of the measurements and do I need to start over?

4. I ran the sweeps with all of my speakers connected. Should I have turned off my L,C,R speakers as I could hear bass coming from them during the test. They are crossed at 80Hz.
5. I ran a measurement with all subs going but didn’t save a jpeg of it. Should I be attempting to measure all subs together or focus on measuring separately for the front and back of the room?
6. What adjustments/corrections should I make to measure everything correctly?
Thanks for the help.
kjlewie