In a real room more typically 2-4dB depending on room and placement. So take that off th ewoofer sensitivity. There will also be an inductor that will impact things.
Also worht havin gin the back of your mind is that any flattening in the on-axis will give a corresponding boost in the room response, making for a real can of worms. Taste play s abig role here, many like “too much” bass and that is fine.
dave
Tha is all true (no carpet here). Rooms are the biggest issue in almost every hifi and any manufacturer has to make large compromises wrt that.
DIYers typically only have their room to deal with so they can have fewer compromises.
My room for instance, was very specifically designed to priortize the hifi.
dave
DIYers typically only have their room to deal with so they can have fewer compromises.
My room for instance, was very specifically designed to priortize the hifi.
dave
I don't want to show just how ignorant I can be here, but maybe this is how I learn?
So looking at the Seas chart, I see a driver that peaks ~ 60 to 90 Hz at 85 dB.
Here's' what I would expect:
To get bass flat to 40-ish Hz I'd have to cut the output significantly. OK, lets say I don't want to do that. Let's say I'm good with this peak, then I probably want that 60-90 to be a peak, and everything else to be below it. I'd tune to a target of around 83 dB at 1 kHz. That would hopefully give me flat output past the peak.
Still, to me, this is very low output for a 3-way, whether we say it's 85 or 83 dB @ 1kHz.
What do you fine and experienced folks think?
So looking at the Seas chart, I see a driver that peaks ~ 60 to 90 Hz at 85 dB.
Here's' what I would expect:
To get bass flat to 40-ish Hz I'd have to cut the output significantly. OK, lets say I don't want to do that. Let's say I'm good with this peak, then I probably want that 60-90 to be a peak, and everything else to be below it. I'd tune to a target of around 83 dB at 1 kHz. That would hopefully give me flat output past the peak.
Still, to me, this is very low output for a 3-way, whether we say it's 85 or 83 dB @ 1kHz.
What do you fine and experienced folks think?
I would add two things to that. The peak does look useful in bridging the gap. This arbitrary higher Q box rolloff response goes against traditional DIY thinking that the Q shouldn't be too high, but fits in with more modern thinking that considers the resulting response and the room to be at least as important. Either way, this plot might be better labelled a 'serving suggestion'.
Then there's what Dave and others have indicated. This energy is not lost, but goes into modes and the solution is generally a matter of compromise.
Then there's what Dave and others have indicated. This energy is not lost, but goes into modes and the solution is generally a matter of compromise.