Moving swiftly back on topic here, with mobile phone powered by a lithium battery in hand...
@weltersys thanks for the kind offer, will PM, but I am in the UK so might not be so easy...
Meanwhile I see that at least Qspeaker says I could do this with the FaitalPro driver. Two 3 x 6 x 14.5cm ports could quite easily be cut into the back of the box, and Solidworks says the box is 14.97L. I really wish I knew what the current speaker is so I could model it, but there is just no info whatsoever on it...
@weltersys thanks for the kind offer, will PM, but I am in the UK so might not be so easy...
Meanwhile I see that at least Qspeaker says I could do this with the FaitalPro driver. Two 3 x 6 x 14.5cm ports could quite easily be cut into the back of the box, and Solidworks says the box is 14.97L. I really wish I knew what the current speaker is so I could model it, but there is just no info whatsoever on it...
Yeah, the shipping costs would far exceed the driver costs 🙁
You could use REW https://www.roomeqwizard.com/
to measure it's response.
Honestly, unless you intend to play bass guitar through the little Pignose, I don't think the extended bass response below 100 Hz will make any difference at all.
The lowest fundamental frequency from a guitar in standard tuning is only 82 Hz, and the few spectrograms I've seen show little to no fundamental present; with normal playing technique, most of the energy is in 2nd and 4th harmonics, at roughly 166 and 330 Hz, respectively.
Marshall 4x12 cabs, famous among guitarists for strong bass, actually have a frequency response that falls like a rock below roughly 120 Hz: https://www.aikenamps.com/index.php/frequency-response-of-a-marshall-4x12-cabinet
However, SPL at 150 Hz is some 10 dB higher than it is in the 1 kHz - 2 kHz band; that is why these cabs produce strong-sounding bass! It's about the EQ curve, not deep bass extension.
-Gnobuddy
From the original post:
So my plan is in fact to play bass through it.
However, as I say I'm surprised by how well the Pignose does do already. It's already an improvement over the built in speaker on my uke, especially since I have it wired so it plays through the internal speaker and the output at the same time, so when I plug it in I get both. In fact I think it fulfils the requirements I made of it in that it will give me enough volume in the situations I needed it, such as larger bands and accompanying choirs.
So I'm going to put on ice the improvements that require financial outlay at this point.
I'm still wondering, though, if a little damping would help the low end performance? Always lots of pillow stuffing lying around...I guess you'll all say that's something that can be modelled as well...
So my plan is in fact to play bass through it.
However, as I say I'm surprised by how well the Pignose does do already. It's already an improvement over the built in speaker on my uke, especially since I have it wired so it plays through the internal speaker and the output at the same time, so when I plug it in I get both. In fact I think it fulfils the requirements I made of it in that it will give me enough volume in the situations I needed it, such as larger bands and accompanying choirs.
So I'm going to put on ice the improvements that require financial outlay at this point.
I'm still wondering, though, if a little damping would help the low end performance? Always lots of pillow stuffing lying around...I guess you'll all say that's something that can be modelled as well...
I think bass ukulele probably produces even weaker fundamentals than a bigger bass.
Going direct (no speaker), I've found my (full-size) basses usually sound better, and sit better in the mix, if I high-pass them at around 70 Hz. Even the 5-string basses, which can hypothetically get down to about 31 Hz fundamental frequency (open low "B" string).
If you mic the speaker in a bass amp instead, the speaker probably takes care of that high-passing for you.
Probably easy to model with software (a numerical solution, not an analytical one).
And then there is the even easier route of chucking some stuffing in there, and using your ears as a guide. 🙂
The transmission-line aficionados probably know more about this, since stuffing is the heart of any usable TL speaker system.
-Gnobuddy
Going direct (no speaker), I've found my (full-size) basses usually sound better, and sit better in the mix, if I high-pass them at around 70 Hz. Even the 5-string basses, which can hypothetically get down to about 31 Hz fundamental frequency (open low "B" string).
If you mic the speaker in a bass amp instead, the speaker probably takes care of that high-passing for you.
From the pencil-and-paper pure math end of things, I haven't had much confidence that I've been able to model pillow stuffing correctly. Firstly there's the question of how exactly it restricts airflow (is the restriction proportional to air velocity? To air velocity squared?), then there's the question of how it affects heat (isothermal? adiabatic? something else?) during the alternating compressions and rarefactions that make up sound waves.
Probably easy to model with software (a numerical solution, not an analytical one).
And then there is the even easier route of chucking some stuffing in there, and using your ears as a guide. 🙂
The transmission-line aficionados probably know more about this, since stuffing is the heart of any usable TL speaker system.
-Gnobuddy
Have there been any lately? I know they were used in Beetles during the Nazi era, and later Super Beetles through the 1970s or so.
VW currently does make multiple electric and hybrid vehicles, packed with highly flammable lithium batteries.
Burning lithium reaches 2000 degrees C, or 3632 Fahrenheit.
Above quote taken from here: https://www.nfpa.org/News-and-Resea...022/News-and-Analysis/Dispatches/EV-Ship-Fire
-Gnobuddy
Porsche did Magnesium engines for racing and when their cars got too butt-heavy. That's from when there was some distinction between Porsche and VW, but they never were far apart. And apparently now little VW owns "ALL" the hi-class brands including their former spin-off.