I wasn't thinking so but I don't like to assume...The woofer I am looking at has all the specs I want except for 16ohms and the Qts is lower than desired. Q is also tied to the roll off is what I gather from
So no matter which woofer I use...I planned on using a low order HP filter somewhere around 45hz or so, based on excursion performance vs spl.....This is going to drive Q higher/lower(?) than an unfiltered 0.5Qtc so I am not sure what to think about this. The idea of keeping this 0.5 Q theme along with achieving flat FR and maintaining critical dampening at the same time. On top of that, Room. Q directly affects spectral decay/Decay, I would think, and it seemed to me that when I was discussing decay and spectral decay times, before, the general consensus was that the excess decay gets "drowned out"....yet I know I've read peoples perception of differently damped systems so obviously something is being perceived differently.
Maybe adjust qtc/fs with filter and
So no matter which woofer I use...I planned on using a low order HP filter somewhere around 45hz or so, based on excursion performance vs spl.....This is going to drive Q higher/lower(?) than an unfiltered 0.5Qtc so I am not sure what to think about this. The idea of keeping this 0.5 Q theme along with achieving flat FR and maintaining critical dampening at the same time. On top of that, Room. Q directly affects spectral decay/Decay, I would think, and it seemed to me that when I was discussing decay and spectral decay times, before, the general consensus was that the excess decay gets "drowned out"....yet I know I've read peoples perception of differently damped systems so obviously something is being perceived differently.
Maybe adjust qtc/fs with filter and
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vs
Kjeldsen - Thank you for the clarification! if I add a resistor to change resistance from 8ohm to 16ohm do I dbl Qes?
camplo you might find this contained within a review of a Seas midwoofer interesting as it pertains to TS parameters varying significantly with drive voltage.
Seas Excel 6" W18NX003 (E0096-08) midwoofer review | HiFiCompass
Remember that in room at these frequencies when you have EQ available all that really matters as far as specs is Vd and thermal capability
Seas Excel 6" W18NX003 (E0096-08) midwoofer review | HiFiCompass
Remember that in room at these frequencies when you have EQ available all that really matters as far as specs is Vd and thermal capability
Attachments
Yeah, no 3rd party data available to verify performance.
From my professional experience, JBL is nice, but there are much better speakers these days.
I have this piece of evidenced to vouch for the Oberton I've zero'd in on
Ocean Way Audio HRA Loudspeakers | What's Best Audio and Video Forum. The Best High End Audio Forum on the planet!
Oberton 15NMB600 - 15" Subwoofer
I am starting to hypothesize that my 16ohm 15m was made using a resistor to raise impedance, resulting in the loss of efficiency and halving TM. Qms is near enough to break in to spec. Its just Qes thats off, if you increase Wire length to increase resistance you will end up raising TM....My TM is not raised...it is matching that of the 8ohm model So the only other culpurit would be the magnet and that is unlikely the issue.
This is what I've come up with from reverse engineering as I study how the Thiele specs relate.
To Fluids point. Small signal specs should remain so....small signal. Smaller the signal the more accurate they say. As long as its not too small. The >.0.4v or so I've seen generated with the DATS on this 16ohm driver might be an issue...but is it enough to throw off Qes??? To exactly Half of expected Qes
Ocean Way Audio HRA Loudspeakers | What's Best Audio and Video Forum. The Best High End Audio Forum on the planet!
Oberton 15NMB600 - 15" Subwoofer
I am starting to hypothesize that my 16ohm 15m was made using a resistor to raise impedance, resulting in the loss of efficiency and halving TM. Qms is near enough to break in to spec. Its just Qes thats off, if you increase Wire length to increase resistance you will end up raising TM....My TM is not raised...it is matching that of the 8ohm model So the only other culpurit would be the magnet and that is unlikely the issue.
This is what I've come up with from reverse engineering as I study how the Thiele specs relate.
To Fluids point. Small signal specs should remain so....small signal. Smaller the signal the more accurate they say. As long as its not too small. The >.0.4v or so I've seen generated with the DATS on this 16ohm driver might be an issue...but is it enough to throw off Qes??? To exactly Half of expected Qes
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The right level of signal would depend on the expected voltage during use if that is known. Most hifi woofers will be looking at 2V plus as they tend to be in the mid eighties SPL at that voltage.
This is why SEAS measures at that voltage. And the difference in Fs can be quite significant from 47 down to 35 in that example.
Qes has Fs as a term in it's derivation, without running comparison calculations I don't know how much it would have to change. Do you really think AE hid an 8 ohm resistor inside to turn an 8 ohm speaker into a 16 ohm one?
Are you able to get the Oberton drivers ? Not all of them are readily available even outside of a global pandemic.
Unless you can control all parameters including temperature box tuning and bass response can be quite dynamic.
There was a massive upset at ASR when Amir measured a Neumann speaker and the bass response did not match the manufacturers anechoic measurements.
It turned out that he measured it when the room was quite cold.
Neumann KH 80 DSP Speaker Measurements: Take Two | Audio Science Review (ASR) Forum
So you might want to worry about your heater or AC unit more than your TS parameters
I really don't know
At 233 Euro each when buying two it seems like a pretty good deal, pull the trigger before they are gone
It's not about trusting the DATS v3.
That is the wrong question.
The system itself probably works fine.
It's only not the right tool to investigate and verify basic parameters of loudspeakers as well of getting a kind of idea of performance that can be expected.
The only exception is using it for passive filters, way above Fs.
That being said, it is WAY to overpriced for what you get anyway.
Measurements mean everything, since you can backup your choices with actual data.
So after a while it's a simple choice between knowing what you have and what to expect vs gambling what to expect.
Obviously that is a little exaggerated and simplified, but that's in essence what it comes down to.
Stating the Q factor without knowing the context is usual.
Especially from a bigger picture point of view aka actual measurements etc.
In a sense also not really relevant since they can be very easily corrected anyway.
Qms/Qes can not be "corrected"....that was just brought up in the recent discussion
From your thread on Le vs Bl (not really but sorta kinda) I learned that I build towards Le dominate playback. I am trying to keep excursion limited on the middle woofer by using a low order high pass around 45hz with the AETD15m, but this sort of choice is contingent on the roll off of the woofer chosen. Modelling for the Oberton 15NMB600 moves that point around but what I did was model the HP so that excursion never raises past 2mm for high spl levels, allowing midrange excursion to be limited, separate, from the volume knob. Never the Less, the lack of excursion relieves BL issues, High passing F relieves Q issues. Crossing over low enough gets rid of Le issues.... I feel like I've simplified it so that a plethora of 15"s could pull this role off and sound pretty much sound the same.... Am I wrong?
From your thread on Le vs Bl (not really but sorta kinda) I learned that I build towards Le dominate playback. I am trying to keep excursion limited on the middle woofer by using a low order high pass around 45hz with the AETD15m, but this sort of choice is contingent on the roll off of the woofer chosen. Modelling for the Oberton 15NMB600 moves that point around but what I did was model the HP so that excursion never raises past 2mm for high spl levels, allowing midrange excursion to be limited, separate, from the volume knob. Never the Less, the lack of excursion relieves BL issues, High passing F relieves Q issues. Crossing over low enough gets rid of Le issues.... I feel like I've simplified it so that a plethora of 15"s could pull this role off and sound pretty much sound the same.... Am I wrong?