This is a guide to placing Focal Profile's in the optimum location. If you are intereted in upgrading your Focal Profile 918's to 2016 levels of performance please visit the Focal Profile 918 Ultimate Upgrade Guide page.
So I here are my secrets to getting incredible sound from the 918s that you have today.
In addition to tonal balance the thing most never have right is the imaging. These are great speakers for imaging, thought it tends to be on a single plane, from left to right and front to back they throw a wide and deep sound stage and disappear. The 918s are also very room friendly and have a really sweet tweeter.
ToolsItems you will need:
- Soundocity outrigger feet
- Bosch GLL 1P Laser Level or equivalent. A simple level will not be enough.
- Masking tape
- pencil, darker and wider is better.
- 8 1/2" by 11" sheet of craft felt. Black or very dark color.
Tweeter TamingOne of the best, and least expensive, tweaks for the profiles is to line the grill with felt to either side of the tweeter. This is huge. It smooths out the treble while deepening the sound stage. Take your felt sheet (available from any craft or art supply store for about $0.50) cut a strip about the width of the top portion of the grill, that acts as wings to the tweeter. You will need two sections per speaker, one for either side of the tweeter. Fold in half and make the oval V cut out for the tweeter mounting. You will probably want to leave about 1/2" of space. Stuff behind the grill cloth. You do not need to use felt with adhesive. In fact it's neigh impossible to stuff that back there. Done correctly this ends up being invisible.
The Sweet SpotYour seating position should be in between the speakers but no closer than to form an equilateral triangle between the seat and speakers. I find that further away works as well if not better. If you are closer than that I would suggest moving the speakers closer together or moving the seat further away.
Bass/Midrange BalanceAdjust distance from rear of speaker to wall until bass/midrange balance at your seat is good. If bass is boomy move away from wall. If weak, move towards the wall. Measure distance from rear of speaker to wall, make sure both speakers are same distance.
Turn all outrigger knobs counter clock-wise to get speakers as low as possible. Level speakers front/back, side to side and angle straight ahead. With the outrigger feet this takes 10 minutes. Hours otherwise.
Toe-in is the amount we will turn the speakers towards the listener. Proper toe-in affects imaging and treble balance.
The goal is to find the speaker angle which provides you with great imaging. To me this means the following:
- Instruments and performers are evenly filled in from left to right.
- The speakers no longer appear to be the source of the sounds
- The imaging in the center is as strong as between the center and either speaker without gaps.
- Music may appear to be coming from wider than the speaker placement.
The one place where the 918s suffer in terms of imaging is height. They tend to image in an area like a strike zone, centered between the midrange and tweeter.
PreparationMeasure the distance from the side wall to the center of each tweeter housing. Using a tape measure and level, on the opposite wall place masking tape horizontally from that distance to about a foot and a half in on both sides of the wall. Mark every two inches inwards for about a foot.
Turn on laser level. Place on top of speaker so line is vertical. The line should cut tip of tweeter casing and center of "C" in the word "FOCAL." on top. Now turn speaker on a rear foot (you did get the outrigger feet, right?) until the laser cuts outermost pencil mark on the masking tape on the oppositve wall. Repeat both sides. If you've done everything right, you should be able to put the laser level on one speaker, facing the opposite speaker so the line is vertical and slice between the grill and speaker on both speakers simultaneously. Adjust if not true. Now your speakers are perfectly square to the room.
Setting ExpectationsSit in the expected/desired sweet, then try moving forwards or backwards 2-4" a a time until find a magic distance where it all locks in. Think of that as the situation we wish to mimic when you have the toe-in correct. It just may be you found the right place on the first try, but it's unlikely.
Now, put your chair back in your preferred location.
The image may be completely separate or have a left, center and right with holes in between.
The moments of truthFor the remainder of this exercise, you will use the outriggers to keep the speakers from moving excessively by keeping the outermost, rear foot of each speaker in place. When turning the speaker you will tilt the top towards that foot until the remaining 3 feet have just lifted, then turn as needed.
Toe in both speakers so that the laser progresses inwards a single mark. A little after the best angle the image will collapse and speakers will become the main apparent sound sources.
If you have toed in these speakers so the tweeter is pointed at your ears it's too much and you'll get excessive and tiring treble.
Check both speakers again for level, and verify image is still good. Again, outriggers are the way to go. Will also reduce chances of speakers falling on floor.
Now, using a similar method as above, tilt speakers up and down to taste and seating position as you feel appropriate, taking care to keep the speaker level from left to right after each adjustment. Use laser as guide, but this time horizontally to ensure both speakers are tilted equally. In this case you do want the plane of the tweeter to be around the plane of your ears. Remember there's about 3-4" between tweeter and laser level, so if you use marks, say on a board on your chair, or tape on your recliner, adjust accordingly.
Personally I like my ears to be a little below the tweeters. Your mileage may vary.