Yes, and none of them are using cheap DS18 subwoofers.
When a subwoofer, even a 4+4 DVC in series, has 12.9 mH inductance.. it's not even a candidate for a SQ sub. 😂
I get the feeling that your info is 2nd or 3rd hand and that you have never actually put it through it paces in either Dats or listening, and that you are just parroting something from another place. Can you demonstrate some examples of your work with pro-mobile class drivers and non-mainstream box sizes, the background that allows you to make a listening call from just looking at le?
My hifi sub that is going into production, with multiple patents that I invented.
You want your Le/Re ratio to be .5 or below so that the sub will have good multitone/IMD performance. That DS18 sub has a Le/Re ratio of 1.61.
You must have edited this into your comment after I initially replied. Sorry, but that DS18 sub is not going to wipe the floor with other SQ subs.
We will visit the ZXI after the Racer 8. I am expecting it to sound good with massive dubs and running in very small boxes. It would be good to cut the box size down to 30L or so. How big is that box in that video? Max SPL between 30-40hz? Will be good to see which drivers can keep up in the 30L box
I am aware of your work. I hope you have created something that can keep up with the massive dub bass when driven hard for some hours
It isn't my usual form of contribution at all.
Unfortunately, you're on a public forum so as long as I observe the rules, I can post here.
You asked in what appeared to be a rather dismissive manner for the background that enabled the poster to make a particular technical call, but then when he did (in a rather impressive fashion) you could not acknowledge that he most likely does have an appropriate background. I was merely pointing that out - in an indirect manner - because it's rather poor form.
Unfortunately, you're on a public forum so as long as I observe the rules, I can post here.
You asked in what appeared to be a rather dismissive manner for the background that enabled the poster to make a particular technical call, but then when he did (in a rather impressive fashion) you could not acknowledge that he most likely does have an appropriate background. I was merely pointing that out - in an indirect manner - because it's rather poor form.
I have never noticed anything positive or any DIY stuff
You are discounting the previous discussions on this topic in other threads that show that there is no real experience with pro-mobile drivers. I did acknowledge that his development has nothing to do with the style of the ZXI driver as seen in this and previous threads
Pot shots as per norm? Well demonstrated by taking the shot while being oblivious of previous happenings. I wish to steer clear of your attitude
35L. Fb of 41hz with qtc of .55, -3db measured at 33hz. Le of .67mH at 3.4 ohms for a ratio of .2, 21mm one way xmax @ 70% BL.
It actually started life as a car driver, that's what I originally developed it for. The exact sub in the video sans that enclosure; I used that sub in my daily driver for around 6 months prior with 1000 watts and listening daily with a 1hr one way commute to and from work. Went straight from my car to being displayed in the hifi enclosure at cedia. It's just good enough that it can be either a car or hifi sub.
A regular car driver as 33hz FB in 34L with 1kwrms was done 25yrs ago in my SS Commodore. The work with pro-mobile drivers is to nail 33hz Fb and -3 around the mid 20s with clean bass notes all the way down the neck of a 5-string thumbed to very hard attacks or a synth and powered with 2kwrms or more. Not many drivers around that can handle this much punish
The funny thing is that while the driver does promise this ability on paper, we haven't put it through its paces yet, and already you are getting all strung out bashing it? What's the big deal anyway that has yours and Stuey's knickers in a twist. Why not just let it play and see how it turns out?
No it doesn't, you never had a 15" car sub that had a Fb of 33hz in a 34L sealed enclosure. The sub I showed is a 15".
I'm not "strung out" bashing this DS18 sub, I literally just pointed out that the DS18 sub you like is not a SQ sub. That must have really ruffled your feathers, because apparently anybody who doesn't say what you like gets their credentials questioned, and even though I am backing up my credentials, you are now trying to discount my opinion because you think "pro-mobile" drivers behave differently to other subwoofers (they do not).
But since you think I have no "pro-mobile" subwoofer experience, here is a video of the 15" sub from the Cedia video with the voice coil of the new high power "pro-mobile" sub I've been working on. And the OD of the motor steel is 4.5". 😉 https://streamable.com/ocagn9
I'm not "strung out" bashing this DS18 sub, I literally just pointed out that the DS18 sub you like is not a SQ sub. That must have really ruffled your feathers, because apparently anybody who doesn't say what you like gets their credentials questioned, and even though I am backing up my credentials, you are now trying to discount my opinion because you think "pro-mobile" drivers behave differently to other subwoofers (they do not).
But since you think I have no "pro-mobile" subwoofer experience, here is a video of the 15" sub from the Cedia video with the voice coil of the new high power "pro-mobile" sub I've been working on. And the OD of the motor steel is 4.5". 😉 https://streamable.com/ocagn9
Mine was a 12 as you well know from previous discussions. 15 is well out of size for project drivers and not relevant here
Like the driver? It's just an option, like or not will come after listening. I am questioning your credentials in the extreme end of car drivers, as you are the only one making claims and jumping up and down as soon as I mentioned a 17kg driver! Why is this so important for you to bash something not even on the test bench yet? I actually invited you to this thread because of your credentials, I didn't realise that you are so fragile about this driver. I don't understand your reasons for getting upset at getting questioned either, as I have never seen you bring up anything in the 2kwrms range for a 12
As much as I enjoy new developments, bringing the box size down is the topic of the day here and a 15 is just way too wide
You asked for credentials because you did not like my opinion, and I posted credentials. Then you literally asked about the performance of what I posted as a credential, so I told you.
Then you negged my credentials by saying it's not relevant to "pro-mobile" subs. I post a video of part of my 4.5" voice coil "pro-mobile" sub that is in prototye stage, now it's back to not being relevant because we're only talking about small enclosure sizes. 🙄 The goal posts get shifted every single reply to try and neg me out.
I have many years of big car subwoofer development under my belt, as well as hifi (SQ), so I am experienced enough to comment on a sub that is not a SQ sub. Sorry you have a hard time dealing with opinions that you don't like; I made my comment and at this point it is not my problem.
This DS18 sub you like so much already shows a -3db of 42hz in a 21L sealed enclosure listed right in the manual, so it is not going to get that 33hz Fb and mid-20's -3db you are looking for.
I'm done going back and forth, you have fun with your daydream sub builds.
Then you negged my credentials by saying it's not relevant to "pro-mobile" subs. I post a video of part of my 4.5" voice coil "pro-mobile" sub that is in prototye stage, now it's back to not being relevant because we're only talking about small enclosure sizes. 🙄 The goal posts get shifted every single reply to try and neg me out.
I have many years of big car subwoofer development under my belt, as well as hifi (SQ), so I am experienced enough to comment on a sub that is not a SQ sub. Sorry you have a hard time dealing with opinions that you don't like; I made my comment and at this point it is not my problem.
This DS18 sub you like so much already shows a -3db of 42hz in a 21L sealed enclosure listed right in the manual, so it is not going to get that 33hz Fb and mid-20's -3db you are looking for.
I'm done going back and forth, you have fun with your daydream sub builds.
Man, where is all this coming from? I am only putting a driver through it paces
I dont understand your need to bash as yet untested item or to bring in your driver that is not relevant to the topic on hand
This is a bit annoying. The goal has been to shrink the box size down from day one. There is plenty of mention in the ZXI thread regarding the desire to bring the baffle width down too, and not only the cab volume. Also has been demonstrated that there are inconsistencies in the datasheets as mentioned regarding the talks with DS18 tech. Even my current Dats runs shows that the stock clips produce inconsistent results. No point in you getting worked up like this until the driver has been benchmarked
I dont understand your need to bash as yet untested item or to bring in your driver that is not relevant to the topic on hand
It is high time you understood that you are basically arguing about your experience and yet commenting on a driver where we have already demonstrated anomalies in the specs. Either produce some self measured data on this driver or wait for some real measurements when I get around to it
I have a hard time dealing with speculations. Informed opinion is fair enough as always but informed can only come after actual Dats runs to get the real specs
Hold on to this emo stuff until some tests are run, bit early yet man
It's coming from your instigation:
I demonstrate an example of my work like you ask. Then, you say:
You're not very good at gaslighting, Randy. 😂
Maybe you should take your own advice, when you say things like:
Or possibly realize that maybe your own opinion is not informed enough to make such generalizations. 😲
Find your sport elsewhere, please. I have lost enough time with your childish need to argue things. The driver will be tested in due time and that would be a more suitable time to pick it apart. At the moment, the focus is on CVDs