007

let me ask you this, can you bridge your amp down to 2 ohms? Then you can run your sub in parallel and probably get closer to 1400 watts from you amp. otherwise you have to run it at 8 ohms and get a lot less.

Well obviously i have never made one, its really a simple test. Make one with and make one without and measure the THD%, or even do a non-linear dynamic measurement. I will say copper can't hurt and you can never get enough of it in a motor. If its not taking up space in a critical flux gap, then by all means, I would add it. There are some rare cases where high inductance is actually somewhat good because of its peaky nature around 60Hz. A La car audio SPL competition comes to mind. In fact one of our big pro audio neo drivers has a big inductance peak around 60 and its rather nice for sound reinforcement. But in most case, linear is linear and thats what we shoot for. There were a few straws and that was really the last so and we decided to cease all Eclipse orders just last year. In the end they are going with less expensive products now and its really the wrong business for our products. Just the fact you can get an SW8200 for less than a Type-R mortifies me.

I would like to thank Neil for this write up. In no way am i here to make him wrong, but im here to merely add some points from the inside perspective at least about our lms coils. in general we use 4 layer round wire. Thats the most basic subwoofer coil. We that in our TC9's and TC2's for example. An liner coil version does not have extra winding at the bottom or top, but rather a liner reduction made in the middle area to reduce BL product where the driver is most efficient. As a result, mass goes down and inductance does too, but the BL product (in particular the L component only) drops on average by a factor of 30 to 35%. The flux (telsa) density in the gap is identical to a non-linear version. A linear voice coil is a horrible trade off if the driver is under motored, be it LMS or anything else really does need to use a larger motor to gain that back which makes it more expensive. This is in fact why our 4HP motor works so well. The motor is too powerful for any reasonable low frequency driver and it was a prefect candidate for a big LMS. In fact we had a few tight gap versions that pushed past a BL^2/Re of 550-600 and a Qts of ~0.08. Ya... you're not going to make any bass out of that, but at 60Hz tuning SPL burp, hold on tight! The 4" vc allows more steel inside the the t-yoke which prevents saturation to allow us to take advantage of a 10" magnet to get more B. The LMS 18" pushed close to 89dB at 1 watt and we already have plans to reduce nearly 100 more grams and increase the L component of the motor to push it past 90 with ease by next year. Does it mean LMS is better? In fact, any of the above designs can be used with great success to linearize BL, but its really the implementation that makes the difference. I will say one great advantage of XBL is the sublet space in the motor where a shorting ring can fit. I can argue that inductance has very little affect on the response of an LMS in action below 100Hz, but non the less the shorting ring will improve linearity and make the speaker a better one then if it did not have it. That is something that can not be implemented in the other designs. As far a tolerances. LMS is actually one of the most accurate. The BL curve is nearly flat and only deviats when the voice coils are offset (too low/high) as a result of a manufacfuring defect. In the case of the 8200, this was the case and its important for me to say that we did not manufacture any of the production units! We only made a few which were prototpyes and we outsouced the rest. There were defects and a major lawsuit ontop of that, that i can not get into. Lets just say we were not happy. In fact, even in a non-linear voice coil, an offset to the coil such as the early versions of the 8200 will a non-linear behavior as such. It was not specific to the linear coil at all. Not to point the finger elsewhere, but I have seen major deviations in XBL designs too where the BL curve was a double hump, rather than flat. Its important that any of the above, including non-linear high sensitivity designs be manufactured correctly.

Mike is new here, and I advised him to NOT post on that forum, he did it anyway, and I knew what was going to happen so please don't take that as a representation of audiopulse. He later told me, "yep, thats the last time i get personal on a forum." Sometimes you just have to let people lean for themselves, but he is a good guy and he pushes us to get our work done. I have never worked harder here before! Our CS department is still being pulled together. I'm not personally going to be involved in that, but I will from time to time post online to check up on the old DIY community. Thilo and I have been ramping up a lot of new changes not just in product, but in QC for audiopulse. So far we have been on this project for 6 months and there is a major engineering effort behind it. The days internet direct for us are nearly done, so i dont expect too many people here to endorse our new image or product today, but I hope one day when the dust settles, we'll prove to you that this new launch has more than meets the eye. I assume you are one of the owners or a higher up with TC Sounds. So I will be Respectful with my words. I was looking at switching to your company when you began the process of switching over. I have done a lot of research online about TC Sounds and I must admit I was quite impressed with what I found. I then posted this Topic here to get even more pumped up about your products. Being involved in business I understand the need for change to grow and prosper. I did not know what all had transpired with this Mike gentleman until now, I can say however, I have dealt with many people in my past that are unfortunately just like him. After giving many people the benefit of the doubt I have decided that I am tired of the same consequences of my decisions being less than ideal. For that reason I posted my above response where I state that I will not endorse your product from here on out. I am sorry if this seems unfair. I hope you well with your future endeavors and hope your business decisions work out as planned. Thanks for your reply on this topic. hes not in the cs department, he sells directly to dealers, not even to cusotmers. we have 17 other people here that will bend over backwards. I respect your choices, there are many other great drivers besides ours.

Mike is new here, and I advised him to NOT post on that forum, he did it anyway, and I knew what was going to happen so please don't take that as a representation of audiopulse. He later told me, "yep, thats the last time i get personal on a forum." Sometimes you just have to let people lean for themselves, but he is a good guy and he pushes us to get our work done. I have never worked harder here before! Our CS department is still being pulled together. I'm not personally going to be involved in that, but I will from time to time post online to check up on the old DIY community. Thilo and I have been ramping up a lot of new changes not just in product, but in QC for audiopulse. So far we have been on this project for 6 months and there is a major engineering effort behind it. The days internet direct for us are nearly done, so i dont expect too many people here to endorse our new image or product today, but I hope one day when the dust settles, we'll prove to you that this new launch has more than meets the eye.

tc7 is great in a sealed box. You can put it in just about anything larger than a cube and you dont even have to worry about EQ. It doest quite have the BL to do well in a vented system compared to a TC9. If you're going vented, go with 9 otherwise the TC7 is really unmatched in a sealed box as far as ease of install and linear response ie: SQ. as far as TC drivers go.

forgot to say, if you're going to for for 4th order bandpass, you might as well just port it. Which is basically your bandpass response + sealed response and in that case you can tune it lower and cover more frequencies with better efficiency.

4th order bandpass at best it only going to be as loud as sealed, band pass boxes are good when you want to do a very specific frequency range, otherwise, you'll need 6th order or higher to match the sensitivity of a ported box (if you even can). In this case, the RL-p is a very dampened driver so it will naturally roll off in a sealed box faster than a higher Q driver, but like any driver, this is corrected with moddest EQ. The sealed system should be louder once you add EQ to it. The driver will take it just fine, it really comes down to amplification. Also, what is hard to understand in that graph is that the bandpass box is going to roll off with no saving grace (about 18-20dB per octave) after resonance, but the sealed box rolls off slower and like I said, it can be EQ'ed, where as the bandpass box will be unloading below resonance and doomed for the low frequencies, at least where it seems to be tuned at the systme you have now. An impedance graph would lend more information.

holy chit, hivi is using our cones! grrr.... your cones ? hmm, on what model do you have those ? i've never seen them before... Not our own model, our customers... Our website products are only a small fraction of parts we designed. This is our sunfire cone. http://www.sunfire.com/TrueSubwooferEQSigPR.htm

holy chit, hivi is using our cones! grrr....

50Hz is a ~20 foot long wave length, it makes no difference where the drivers are loaded. You want it louder, tune it higher or add more woofers.

They will be in Mike's hands very soon Thanks for waiting

If you want PURE SPL and size does not matter and you want it as cheap as you can get it, then you really bought the wrong driver by a long shot. May I suggest dual 18" PA-2000's. They are less than the LMS and they will be a lot louder. They won

BL product is affected by the resistance of the voice coil. For example, lets say you had two coils, same everything except one is 4 ohms, the other is 1 ohm. Technically the wire would be a little different, but lets ignore this for now... If they were put into the same motor, and the BL was 20 for the 4 ohm coil, it would be 10 for the 1 ohm coil.... make sense? BL^2/RE in this case = 100 N^2/W which is a constant for that driver no matter what the coil config is... there are always small differences here and there, but for the most part you can think of the number as a constant. BL^2/Re tells you which driver has the stronger motor + vc combo so to speak. BTL > BL > Q > SSD for example...

BL^2/Re is actually the motor strength factor, BL doest tell very much as its actually higher on the BM than the mag, but the mag has higher BL^2/Re. And yes, magnet weight is also very informal, but BL^2/Re is.

What are you box dimentions, specs? what is the size of your port (if you have one) what is the lenght of your port what kind of amplifer do you have and how is it wired?

18" = orgasm Perhaps some double entendre there This is of great interest to me. Correct me if wrong, but the rl-p line is based off the TC-9; I remember several years ago, there was talk that TC Sounds had some difficulties coming up with a viable 18" solution when using the TC-9, so I look forward to this greatly. Love that motor. 32 pound motor with a large 3

forgot to add, "larger spiders" too!

I need some help with some spam bots over on 2.1.7, does the new version have better registration protection?

I think it will be in your best interest to divert some of your public attention away from TCS. You have made quite a scene at caraudio.com. To say the least, your malicious slander pertaining to our parts, service and knowledge was unprofessional, but I will forgive you if you can give it a rest. United State Design Patent US D455,733S Speaker Driver Frame Assignee TC Sounds Inc. NDMstang65: If you wish to converse with me, please do so privately or elsewhere. Thank you. Best of luck with your speaker designs Dylan.

ok maybe not so spyish, but what the heck, I had a camera and i was bored. I took an AVI of the 54 with a strobe light, its probably one of the coolest things to look at if you are into high excursion design. Its literally like watching high excursion in very slow motion. I have to edit the video, but I'll post it soon. TC3k next to an LMS-54 proto. (the 3k is 46 pounds and thats the small one) The cursed RE 4" vc desytoryer we tried to recone twice, this one is waiting a third top assemlby tomorrow. No more fixing RE's, lol. the 5400 is on the right again.

under construction... updating some stuff, gonna put the lms4kv2's up tomorrow. the 54's are dual 2 ohm on a titanium former, and we're designing new coils for the 52's which will also be on titanium so they cna handle much more power.

It would be more like 2000-3000 for these kinda of drivers ihave in mind. 600 would not cover our expense per driver.

it could cost about 10,000 in tooling....I'm not saying we couldnt make it back, but thats not cheap! hmmm

videos like this make me want to design an affordable. 22" neo driver that wastes the jackhammer in every aspect (sensitivity, power handeling, output, linear excurion) for under 80lbs. thoughts...?