signal generators and...

Kg, Are you using the Rolls MO2020 generator? I have one and it is a great tool. In general, all you need is a sine wave generator and SPL meter. If you really want to go at it, a frequency counter and the above mention would give you best results.

Alfredo

Alfredo,
Yes I have the same rolls as you.It is a great unit but, what I think is happening while I am sweeping the bass frequencies and adjusting room modes with my parametric is....
I'm not catching the whole mode and just taking a slice of the middle.The Q is too narrow.What I would like to do is plot the room from 20-80hz.Then adjust the room modes, width proper.Sounds crazy but I'm a freak about the bass and something is wrong.I will be able to see the mode rise and fall.I have two that are close together due to the rooms 13.5 x 15.5 lenth and width.Sean gave me a great link to a multimeter that has a frequency counter built in.I can now donate my old Army multimeter to a friend and pickup the Tenma 72-4025.We shall see...39.95 what a deal.

Kg, what do you have other than the rolls? Are you using a SPL meter? What kind of speakers are they? Model? Floorstanders or bookshelfs? These could be some of the factors to consider but judging by the dimensions it look like is your room. Placing bass traps would help. A cube room is the worse place for bass modes because you have the same resonance in all six surfaces. If you want to learn more, go to Rives Audio. They have a ton of useful information. Alfredo

At this point I'm using stand mount monitors.All spkrs are set to small and xover at 80hz.It is quite simple to trouble shoot a room were the bass is xover to a single bass channel(LFE).What I would like is to get a better picture of the peaks and dips.At this point I can see them on my spl meter but I don't have a clue what frequency they are.Those test discs space the signals too far a part and it is difficult if not impossible to sweep.Once I get a frequency counter I can sweep and see what frequency and monitor with the spl meter.While I comment rives for his product and all his wisdom,analog parametrics have been around for years and to price a two ch. with only three bands per ch. at the price he charges I think he should drop the price.I would suggest a pro type for the sub and an eq for the mains.Just my opinion.He is a manufacturer who is overstepping his bounds in these forums.I don't know of any other manufacturer who advertises through forum posts.IMHO.

Kg, go to Partsexpress and look up the Neutrik MR1 and Goldline TS-2. In fact, the Goldline TS-2 has a frequency counter, sine wave generator, and a SPL meter all in one.Alfredo