same here (the split the difference between tilt and backline) I like running mine in backline ositionb tut I find the backline 'setting" loses al ot of "oomph" leaving it "tilt" cures that but is a bit bassy.
I firmly believe that if you don't like what you hear, you should not switch the CLR's presets. For example: if the setting is correct, and the sound is too bassy, I'd adjust things in the Axe-Fx, such as the global EQ.
Jay Mitchell explained the settings a couple of months ago on TGP. Here's the quote (
source):
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Here is a minimalist tutorial on loudspeaker placement and aiming. It is not specific to any model or type of speaker. Guitar cabs are affected by the same acoustic phenomena that affect full range speakers, and to the same degree.
When you wish to use a speaker to provide sound to an audience - as opposed to strictly as a personal monitor - you should elevate the speaker above ear level, place it well away from walls, and aim it towards the approximate (left-right) center of the audience area. There are several reasons for this, some of which are intuitively evident even to nontechnical people:
1. There is a line-of-sight, straight path from the speaker to the ears of every audience member.
2. The listeners that are farthest from the speaker are closest to on axis and nearer listeners are more off axis. This helps reduce volume differences from front to rear seats.
3. Because the speaker is placed and aimed away from nearby room boundaries (floor and walls), the magnitudes of early reflections are minimized. Early reflections always cause undesirable colorations which cannot be equalized out.
The same principles apply whether you are rehearsing or performing in front of an audience. There are some subtleties of placement and aiming that depend on the specific behaviors of the speaker(s) and room, but the above general practice is always best. If you are not the only listener whom you wish to cover with your rig, it is always best to elevate it and aim it appropriately.
If you are using a speaker as a floor monitor, it is almost always serving an audience of one. In some cases there may be a second or third listener, but, even then, the listeners will be predictably located close to the on-axis position. This is the intended purpose of a floor wedge.
If you place your speaker on the floor and aim it parallel to the floor, the sound quality it produces will be irreparably and seriously compromised, but the exact nature of the compromise will vary from listener to listener. This is just as true of guitar cabs as it is of full range speakers. The (very) early floor reflection resulting from this placement/aiming will cause huge notches and peaks in the frequency response (aka "comb filtering"), and this degraded response will affect every member of the audience, as well as the player him(her)self. Because the specific frequencies at which notches and peaks occur vary with the position of the listener, they can never be equalized. Attempts to make things better at one location will inevitably make them worse at other positions.
Note that, in sharing the above, I have made no mention of anything specific to a brand or model of loudspeaker. This is because the above are all based on well-understood, immutable principles of acoustics and apply to all loudspeakers of any type. If you habitually set your cab on the floor aimed horizontally, you should be aware that what you hear from it will always be profoundly different than what anyone else hears. The same applies to setting a wedge on the floor aimed upward, although in that case it really only matters what you hear.
Now, with all the above in mind, I will explain again the basis for the presets in the CLR.
1. "FF" is for free field use. This means any placement/aiming in which the speaker is neither in close proximity nor aimed parallel to a room boundary.
2. "Tilt" is optimized for use as a floor wedge. This preset makes the response flat for a small group of listeners who are close to the on-axis position. Hopefully the motivation for this optimization approach requires no further explanation. The response will not be as flat for listeners who are well-removed from the axis of the speaker. IOW, if you place a wedge on the floor behind you aimed upward and stand well away from the speaker, you will not be hearing the designed response of the speaker.
3. Like "Tilt," "BL" is optimized for just one listener. In this case, however, the choice is forced: there is no way to optimize the response for mutiple listeners, and that optimization is an imperfect one even for a single listener, for all the reasons stated above. If you place a CLR on the floor, select this preset, and stand approximately six feet away from the speaker, the overall response will be balanced. There is no way to optimize any speaker to a greater degree than this when it is to be used in this manner.
