Why do we care at all about the mass of a speaker driver? Because higher mass makes a worse speaker, all else being equal.
We are talking about 2-way speakers, right? What tweeter can be used with a 15", in a 2-way?
What are the breakup modes on a 15" driver? To have a clean response up high enough to be crossed over with a tweeter, a large woofer has to be extremely strong and resistant to resonating, and higher mass works against that. The more mass, the stronger it has to be, and the larger it is, the more it has to damp out resonances.
And if we are talking about covering the bottom octave, then we need a driver that can cover it. Being very loud above 40Hz is one thing, but play well down into the bottom octave is what we are talking about in this thread, I think?
The other woofers I considered are:
Seas U22REX/P-SL 8" Curv Cone: 90.5dB, 29Hz, 19.8gm
Eton 8-612: 90dB 24 / 26Hz and 26.3gm
- but the 92db sensitivity is what made me choose the SB Acoustics SB23NRXS45-4
There are three 8" woofers that have Fs in the 20's, and low Mms. There are others as well, but they have <90dB sensitivity.
What tweeter would you use with a 15" woofer, in a 2-way design? How would you cover the bottom octave with an Fs of 38Hz?
We are talking about 2-way speakers, right? What tweeter can be used with a 15", in a 2-way?
What are the breakup modes on a 15" driver? To have a clean response up high enough to be crossed over with a tweeter, a large woofer has to be extremely strong and resistant to resonating, and higher mass works against that. The more mass, the stronger it has to be, and the larger it is, the more it has to damp out resonances.
And if we are talking about covering the bottom octave, then we need a driver that can cover it. Being very loud above 40Hz is one thing, but play well down into the bottom octave is what we are talking about in this thread, I think?
The other woofers I considered are:
Seas U22REX/P-SL 8" Curv Cone: 90.5dB, 29Hz, 19.8gm
Eton 8-612: 90dB 24 / 26Hz and 26.3gm
- but the 92db sensitivity is what made me choose the SB Acoustics SB23NRXS45-4
There are three 8" woofers that have Fs in the 20's, and low Mms. There are others as well, but they have <90dB sensitivity.
What tweeter would you use with a 15" woofer, in a 2-way design? How would you cover the bottom octave with an Fs of 38Hz?
I just said with a workable freq resp, meaning non of these problems?
As well as low distortion.
For the high part, a good horn or waveguide will work just fine.
See Geddes his design for example, but there are many many others.
Personally I would never cover the whole range with a 2-way to begin with.
Way to much of a compromise on itself.
Especially when you take the room problems into consideration.
For home use as well as pro use.
Unless you're looking for a lot of directivity, I would also not recommend a 15 inch.
More like a 8 inch or 10 inch, playing from 100Hz and up.
As well as low distortion.
For the high part, a good horn or waveguide will work just fine.
See Geddes his design for example, but there are many many others.
Personally I would never cover the whole range with a 2-way to begin with.
Way to much of a compromise on itself.
Especially when you take the room problems into consideration.
For home use as well as pro use.
Unless you're looking for a lot of directivity, I would also not recommend a 15 inch.
More like a 8 inch or 10 inch, playing from 100Hz and up.
Because it's got a rising response instead of flat?
Because it looks too oldskool, so it can't be good?
Because it's too cheap?
Because its Xmax is limited?
Because it doesn't have (need) shorting rings?
At least its 12-inch brother received some recognition.
Attachments
I would get a pair of JBL 2216Nd's. Sound great! Have low TCR wire to combat power compression.
Don't understand the importance being placed on moving mass. It's the sum/combination of all the driver component's specs not any single one that matters.
Rob🙂
Don't understand the importance being placed on moving mass. It's the sum/combination of all the driver component's specs not any single one that matters.
Rob🙂
Hello
I am using a large format 4" compression driver. As far as Fs of 38 I use JBL 2216Nd's with an Fs of 39 so essentially the same. I low tuned the reflex box to 26Hz and used a 6dB bump filter Q2 @ 26Hz to bring my F3 from 47Hz to 25Hz. I can also trim the bump filter to +3 and completely switch it out. Most program material it's subtle depending on LF content of the source material.
Rob🙂
Regarding a diaphragm...Imagine being able to adjust mass and rigidity independently from each other...whats the use of adding mass?
Hello Camplo
Look at the JBL 2234 vs 2235 drivers. The are identical except for the mass ring in the 2235. In this case the added mass lowers the Fs and extends the low end response of the 2235 driver.
Rob🙂
Look at the JBL 2234 vs 2235 drivers. The are identical except for the mass ring in the 2235. In this case the added mass lowers the Fs and extends the low end response of the 2235 driver.
Rob🙂
Why not use a 18“ woofer up to 500Hz.
There are quit some who are very nice in 160-200 liters reflex
FaItal 18Fh500
Oberton 18B450
Hello Camplo
Well it increases the low end "capability" with a sacrifice of 3dB
sensitivity.
Have you ever used either driver??
Different alignments. If I want extended bass you go with the 2235 in a single driver system.
So what are you driving at??
That was an example of identical with just added mass no change in rigidity such as adding mass by doubling the cone thickness or geometry which could obviously change rigidity
Rob🙂
They are still basically "capable" of the same bass extension in both situations
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Hello Camplo
With a general statement like that why are even bothering to ask just, pick any woofer.
They are all "basically capable" whatever that means if that's your yardstick.
Glad you are not picking woofers for me.
Rob🙂
Lol, we've been down this road....excursion ability, sd, and power handling determine low end capability....not F, in regards to a woofer. Rigidity can also be a factor in the quality of the bass.
It is what it is
My hope and prayer is that John Janowitz and Acoustic Elegance will continue to offer world class drivers, and sell to individuals like us, despite the nonsense that has occurred here. His name and company has been besmirched. There is no excuse for the nonsense.
My hope and prayer is that John Janowitz and Acoustic Elegance will continue to offer world class drivers, and sell to individuals like us, despite the nonsense that has occurred here. His name and company has been besmirched. There is no excuse for the nonsense.
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I hardly think my experience, so far, regarding a pair of woofers made from leftovers from a special order, represents Acoustic Elegance as a whole. It is my opinion that the 18H+ is one of the best woofers available for money, period. You are really making it a bigger deal than it is. Calm down. You are literally, nonsensical
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