DR.Spec check out this sweep chart

faster100

I don't know if i did it correct as the meter i am still kinda new at.. far as the -10 on the 60 and 70 scale, what do they represent.. and on each level it only go's up 6+ db, so how do you get the full 60-70 db settings, 70-80 so forth, anyways i did the sweep and typed it into your spread sheet that you sent me, i will try and attach it for you to look over if you would. Thanks again and let me know what this 404 is looking like

faster100

I cant attach the excel file,

faster100

I guess print screen will work,

faster100

and the rest of the page

Dr. Spec

For example, on the 70 scale, -10 represents 60 dB, 0 represents 70 dB, and +6 represents 76 dB. So you have a 16 dB range for each scale setting.

If you can't get a reading on a given scale, switch to a lower or higher scale to keep the needle within the -10 to +6 region and read the number accordingly.

As for the read-out, looks about what I expected, some peak around 50 Hz and extension to about 35 Hz and then a quick decline below that. If you want to do another sweep just to be sure you were reading the numbers correctly, I can take the raw numbers, add the correction factors, and run a graph and post it if you want.

To save time, you might want to start at 20 Hz.

Doc

faster100

Thanks alot Doc, Ok i will do the test when i can run it again today and post the results, I really appreciate it..

ezc

faster100 how did you do the sweep. Did you have all speakers playing, or just the sub? Where did you place the meter, was the meter placed at ear level & at what angle? I have the test tones that I downloaded & burned to cd & I want to do check my system,, On your chart what dose the 0 deg & the 180 deg meen? is it the angle of the meter? Anything else that I may need to know to do the sweep? Or is there a site to go to that explains how to do it? Thanks in advance!

faster100

0 Degree is the phase switch on the sub, I have a tripod that i set the meter on at ear level slightly tilted up (45 degree) i think.
all front speakers playing, they are set to small so it doesnt really effect the mains, I start the burned cd, and everytone that plays i watch the meter and write it down, Dr.spec has a excel spread sheet he uses and i just added my sub to the list...

Dr. Spec

Originally posted by faster100
all front speakers playing, they are set to small so it doesnt really effect the mains

Actually, it does affect the mains if you use an 80 Hz crossover to the sub. That's one of the nice things about the 80-100 Hz tones; they are played primarily from the mains, and you can also evaluate the effect of the phase control at the crossover point.

In my room, 0 degrees = an 8 dB null at 80 Hz. 180 degrees = no null at all at 80 Hz.

Doc

ezc

Thnaks for the response. What readings should I be looking for? It there a certin reading I would want through out the range? Or should I have a steady increase all the way up? What vol level do I use? I think I should be using the same vol that I use to set up my speakers. thanks for the help!