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Multi-Way Conventional loudspeakers with crossovers

Port near floor best for good/best room integration?
Port near floor best for good/best room integration?
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Old 17th June 2019, 08:29 AM   #1
celef is online now celef
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Default Port near floor best for good/best room integration?

I see many speaker mfs position their ports near the floor for best room integration as they say.

However, acousticans often says that placing a vent or driver near a boundary gives a gain boost and you excites room resonances maximally, which more often is a bad thing as they say.

So what is really the best location?

In my mind, a small monitor with limited low freq output could benifit by a vent location near the floor to gain some boost, but a big loudspeaker with lots of low freq output, with the vent near the floor, has the potential to give an overblown bass response?
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Old 17th June 2019, 09:03 AM   #2
Bill Coltrane is offline Bill Coltrane  Netherlands
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Why don't you measure it?




Small speaker on stand vs small speaker on floor.

Then compare bass responce at listening position.
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Old 17th June 2019, 09:59 AM   #3
jo-briggs is offline jo-briggs  United Kingdom
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Quote:
Originally Posted by Bill Coltrane View Post
Why don't you measure it?

Small speaker on stand vs small speaker on floor.

Then compare bass responce at listening position.
Possibly because he, like me, does not have the equipment and sees no reason to spend /$ 100s to find an answer, that clearly you already know, but are unwilling to impart...
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Old 17th June 2019, 10:11 AM   #4
Bill Coltrane is offline Bill Coltrane  Netherlands
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Quote:
Originally Posted by jo-briggs View Post
Possibly because he, like me, does not have the equipment and sees no reason to spend /$ 100s to find an answer, that clearly you already know, but are unwilling to impart...
1 I don't know the answer, because I don't know his room and speakers.
2 investing in proper tools will save you money in the long run.
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Old 17th June 2019, 10:13 AM   #5
as_audio is offline as_audio
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Related reading here : BASSTRAX - FYNE AUDIO
It does not mean I agree with this point of view.
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Old 17th June 2019, 12:49 PM   #6
celef is online now celef
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Quote:
Originally Posted by Bill Coltrane View Post
Why don't you measure it?




Small speaker on stand vs small speaker on floor.

Then compare bass responce at listening position.
i can, but i want your opinions, that is why i posted here
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Old 17th June 2019, 12:53 PM   #7
celef is online now celef
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Quote:
Originally Posted by jo-briggs View Post
Possibly because he, like me, does not have the equipment and sees no reason to spend /$ 100s to find an answer, that clearly you already know, but are unwilling to impart...
i can measure but i want your opinons
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Old 17th June 2019, 12:57 PM   #8
celef is online now celef
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Quote:
Originally Posted by as_audio View Post
Related reading here : BASSTRAX - FYNE AUDIO
It does not mean I agree with this point of view.
just what i meant, mfrs often choose vents near the floor, is this really any good or is just a hype?
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Old 17th June 2019, 01:16 PM   #9
sangram is online now sangram  India
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IMO

Port placement near floor has to be optimised according to the box tuning and driver's abilities.

It's a handy technique to extend the response down half an octave or so *if done well*. My sense is that it's best used in cases where the room modes are benign to begin with (which means room remains the most important thing anyway), and the box/driver combination does not excite those modes.

The few times I've tried it it seems to work well. A front-facing port near the floor can be used to prevent some floor bounce associated with two-way speakers with a high-mounted midbass driver. Also reduces midrange leakage a bit without requiring a rear-facing port (which has its own issues). However am unsure if it actually helps the bass response.

A downfiring port is the toughest nut to crack and will *not* sound good everywhere. I've built an example of each, both with very different driver combinations and design goals, and both have worked out quite well.

Previously my attempts with downfiring subs and ports were less than successful because I was trying to push for unachievable results. Once I began tuning the box higher, I had better outcomes.
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Old 17th June 2019, 01:24 PM   #10
paulys55 is offline paulys55  United States
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Quote:
Originally Posted by as_audio View Post
Related reading here : BASSTRAX - FYNE AUDIO
It does not mean I agree with this point of view.
That looks exactly like Polk Audio's Power Port
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