The Advantages of Floor Coupled Up-Firing Speakers

I was recently experimenting with my Tannoy XT Mini tilting them up toward the ceiling and then playing pool with them so that they would bounce back down at the seating location. There was to my complete surprise no sense of loss of high end and the stage and image was remarkable I think the most realistic I have ever experienced. This is something that I want to continue to work with.

Interesting! Any follow-up?
 
Sonab OA-4 enclosure with new drivers. Loudspeaker for being put against a back wall.

20cm driver fullrange driver with copper ring (working up to 4khz naturally) with aluminium foil on both sides (sandwich-design) and four tweeters in 2-2 design - 12 Ohm each (impedance total 12 Ohms) with only one capacitor. Tweeters are legendary Audax copies known for being able to work just with one capacitor (ferrofluid and diaphragm a mix of cone and dome).

Works nice with driver against the wall but some suckout at 260 Hertz which is the only part where I use dsp control to fill it up. Maybe this depends heavily on your room and if you have a resonance from floor to ceiling.

The cabinet is reflex loaded to 30 Hertz and the speaker gives quite impressive bass. As this is some kind of a horn loaded to floor and one wall.

I like the sound.

The walls were reinforced with beton 1cm inside.

Measurements are far field approx 2.5 meters away in listening height. This is the true in room response.

Quite important in my listening experience: below the the tweeters I added some thin absorbing felt. I usually always put on the loudspeaker fronts some damping as known from loudspeaker manufacturing history for better imaging, eliminating some of the first reflections from the cabinet itself
 

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I understand very good now why Sonab speakers were so popular in northern europe. In sweden they nearly had a monopole on this as everyone used and bought them.....

The sound is great - I like the horn like sound reinforcement by this kind of speaker placement. Easier than corner loading but still very efficient.

Read a lot about it on the Carlsson Website.