Hi NEO Dan,
"DSL actually publishes 28.3v/10m/GP, regardless of the nominal impedance of the system."
One can make an argument for that, as the modern amplifers have usually a great deal of current reserve, and the impedance of most loudspeakers-in the subwoofer/woofer range-is pretty much all over the place. To me, it really wouldn't matte as long as everybody is using the same methond. Naturally, fixed voltage/fixed distance/fixed pattern gives an advantage to the lower impedance speakers.
No answer yet from Jeremy, I thought I was asking nicely?
Regards,
"DSL actually publishes 28.3v/10m/GP, regardless of the nominal impedance of the system."
One can make an argument for that, as the modern amplifers have usually a great deal of current reserve, and the impedance of most loudspeakers-in the subwoofer/woofer range-is pretty much all over the place. To me, it really wouldn't matte as long as everybody is using the same methond. Naturally, fixed voltage/fixed distance/fixed pattern gives an advantage to the lower impedance speakers.
No answer yet from Jeremy, I thought I was asking nicely?
Regards,
What do you think of this standard: 2.83volts 2 meters GP (= 1w/1m ref: Audioholics Subwoofer Measurement Tactics ) It was used many times and it gives compatibles results with sim softwares.
If you do 28.3volts/10 meters, it is a clear advantage (in terms of sensitivity) over the 2.83 volts/2 meters.
If you do 28.3volts/10 meters, it is a clear advantage (in terms of sensitivity) over the 2.83 volts/2 meters.
hi oliver .
what neo dan means is the nominal impedance.
for example the th 221 has two 4 ohm speakers in paralel @ 28.3 volts@ 10 mtrs,giving it a wopping 109 db.would 14.1 volts be wright in this case?
a standart 1 watt or 100 watts would be better for comparison.
in the end its the maximum long therm output that matters imo.
regards erik
what neo dan means is the nominal impedance.
for example the th 221 has two 4 ohm speakers in paralel @ 28.3 volts@ 10 mtrs,giving it a wopping 109 db.would 14.1 volts be wright in this case?
a standart 1 watt or 100 watts would be better for comparison.
in the end its the maximum long therm output that matters imo.
regards erik
Last edited:
I like to use the measured system Zmin in its effective bandwidth to calculate the required voltage to arrive at 1w or 100w. That way even though you cannot account for the complex shifting with frequency you can at least ensure that each system is receiving about 1w or 100w at most but no more.
An externally hosted image should be here but it was not working when we last tested it.
I saw Skrillex on his 'Mothership Tour' last October, and I'd say it's probably one of my five or ten favorite concerts I've ever been to in my life. It gave me a renewed appreciation for bass. Ever been on a rollercoaster? The bass at these shows feels like the drop on a rollercoaster. It's unreal.
I saw the same DJ in Las Vegas, and it wasn't even CLOSE to the experience of The Mothership Tour. And what was the difference between the two shows? You got it, "PK Sound." One had it, one didn't.
DJK has met me; I'm no basshead, I'm a 41 year old software developer, but these systems will make you a believer.
I have a thread on diyma where I was trying to decipher how on earth that show had bass like that:
DIYMA Car Audio Forum - View Single Post - BASS! How Low Can You Go?
Last edited:
i was thinking the same.
i think its a 1way figure or a x-limmit figure looking at the driver.
nothing unusual.
i think its tuned between 35 and 40 hz ,it has a 30hz 24db lr hpf.
the specs say it is usable from 25 hz to 160hz ,but it doesnt say how loud it wil go at 25 hz
after that it says 28 to 150 +-3db but again ,how loud?
then it says 139 db spl max.@1mtr ,wich is a theoretical vallue.
now im not saying its a bad sub.
its probaply just as good as any other.
with the dsp settings you can add dynamic bass and some harmonics.
Last edited:
Lol, an Sd of 1460 cm^2. That makes it 16% larger than usual which means less room for the surround and more air resistance...
So it's actually a low mass low Fs driver with an abnormal large surface, high sensitivity and still capable of 21.3mm Xmax.
Maybe we should wonder what is in the coffee machine at Radian...
I'm not sure if others are guilty of this, but I know that I have a bad habit of dismissing 'conventional' boxes. (Sealed, vented, etc.)
Here's a sim I did of the PK box versus my TH-Mini 'clone'. In the sim we see:
1) the PK box may well be capable of hitting peaks of 139dB, albeit briefly
2) the TH-Mini is astonishingly efficient for such a small box
3) the PK box just clobbers the TH-Mini below 50hz
I'm pretty sure the Bassnectar show I went to a couple days ago was using the PK boxes, and I can attest to them being mind-blowing
But is there any terribly unique engineering here? No not really, but that's not necessarily a bad thing. The boxes mostly seem to be the convergence of some very very large amplifiers along with a couple of woofers that can take the abuse.
As a regular concert goer, it's great to finally hear 30hz at a show. (Lots of theatres do 30hz, but getting pummeled like that a concert is unusual imho )
we agree
. The boxes mostly seem to be the convergence of some very very large amplifiers along with a couple of woofers that can take the abuse.
stack enough of them ,and it wil shake your pants off.
btw
An externally hosted image should be here but it was not working when we last tested it.
this is with a 30 hpf as they suggest.
Well.....to me a 30hz 4th order filter says the -3db point is at 30 hz, combining pat's plot with a HPF would pretty much give you their plot, so I would still have to say the tuning is in the low 30's, if not 30. I'm currently building a box tuned to around 37 hz, the modeled response is definitely rolling off higher than these.
Ding ding ding, we have a winner....
When asked directly about the motor geometry and suspension limits Radian declined to give any specifics;
"The Xmax listed is the mechanical limit and is the difference between the coil and gap height. The suspension limit exceeds the Xmax. I don't have a value for that at this time however; I have never seen a speaker of ours fail due to spider/suspension failure."
When asked directly about the motor geometry and suspension limits Radian declined to give any specifics;
"The Xmax listed is the mechanical limit and is the difference between the coil and gap height. The suspension limit exceeds the Xmax. I don't have a value for that at this time however; I have never seen a speaker of ours fail due to spider/suspension failure."
I just finished talking the Mark at Radian Audio at 8AM this morning.
The surround is a 4-rib roll, and it is indeed 21mm one-way. I'm waiting for their machinist to get back with the measurements as regards gap and coil height, he claims x-limit is about 4" peak-to-peak. It has been tested at 4KW pink-noise for 4 hours, deserving at least a 1KW AES rating. Until a bunch of these have been out in the field a while they won't release a final data sheet on them. He is looking into some of the inconsistencies on the data sheet (both at Radian and US Speaker).
The cone is of a a new design and material, much heavier than the run-of-the-mill normally seen.
A special magnetizer had to be built, the existing model could not fully charge this dual-magnet design.
I am temped to try one (other than the price).
There is a 15" version as well, but it is not much cheaper.
The surround is a 4-rib roll, and it is indeed 21mm one-way. I'm waiting for their machinist to get back with the measurements as regards gap and coil height, he claims x-limit is about 4" peak-to-peak. It has been tested at 4KW pink-noise for 4 hours, deserving at least a 1KW AES rating. Until a bunch of these have been out in the field a while they won't release a final data sheet on them. He is looking into some of the inconsistencies on the data sheet (both at Radian and US Speaker).
The cone is of a a new design and material, much heavier than the run-of-the-mill normally seen.
A special magnetizer had to be built, the existing model could not fully charge this dual-magnet design.
I am temped to try one (other than the price).
There is a 15" version as well, but it is not much cheaper.
Last edited:
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.