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007

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About 007

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  1. Warden is a crazy sub, but keep in mind the Ti pro has a larger coil and more BL product, so two of them are pretty stiff competition against anything, even if its neo. You'll want to replace them with two of something else (not one) if you want to even try and maintain that kind of power handling. The 4HP handles more power than 3" coils so you'll need more sensitivity to make up for that, or simply more motors of something else. If you're serious about a good upgrade from Two Ti pros and you want more SPL, honestly two 18" TC Pro 5100 is a solid choice. It actually gets louder than the 15" Ti pro by about ~4dB off the same power and has a lot better sound quality, higher xmax, lower inductance, much less and AC modulation. It won't handle as much power, but it does have a 4" vc and more sensitivity, but it's also extremely durable so you will get an increase in SPL. They should be OK with a 2k-3k amp on each woofer.
  2. you'll spend 2-3 grand tooling that surround + design fees of $100+ per hour. It will be only detrimental to your woofer because of the weight (moving mass). That last few mm of xmax you get out of it only matters for the max excursion point at max system power - which probably only 1 frequency too. This is very irrelevant and you'll comprise the other 99% of the performance. Let the engineers design what they feel is best and just trust them on that. There are plenty of good high excursion woofers out there. If you need more displacement the best way to get it is add more drivers! Here is one thing to consider: you're model does not account for room gain. In a typical living room you'll get 10-15dB gain at 10Hz and below simply because of the long wavelengths, so you can get away with surprising good SPL from sealed systems that don't have high pass filters without crazy xmax figures. In a car you get the same gain, but it starts at an even higher frequency because the "room" is smaller
  3. 007

    BL seal with passive radiator?

    ^ I see the professional maturity has not diminished. I really hope i get to meet you one day. 1:1 ratio w/ TC Sounds designed woofers and passive http://www.sunfire.com/productdetail.asp?id=8 cheers
  4. 007

    BL seal with passive radiator?

    would going with 2 15" PRs or a single 18" PR lessen the likelyhood of having to attach so much weight to the end of the spider for low tuning? Again, my size constraint is depth, not width or height, so I have room for multiple PRs.... I'm considering a 2.5cf box, a single 12" Bl on 1 side, and 2 15" PRs on the opposite side.... I'm trying to create a shallow of a box as possible... thanks again for your thoughts Linh ^ I wouldnt do that, dual 15" VMP with 1 12 is totally not necessary. one 12 to one 12 is a good fit for most applications, but a system model would be a good idea. And two pr's actually needs more mass individually that one to reach the same tune. The mass won't break it either, I'm not sure what experience Adrian has had with TC passives, but that is just not the case with these. I can give you some further assistance with the design, check your PM.
  5. 007

    TC Sounds LMS-R 12"

    I don’t like driver comparisons to other brands for many obvious reasons so since this is a new driver, I’ll draw some comparisons to our older stuff. The LMS-R is probably most similar to the older LMS-4000 and AP-REVO mixed together. It gets a major boost in BL product thanks its a 4-6 linear coil rather than a 2-4 linear coil. – yes the inductance goes up, but it’s designed for bass, not midbass. This means the gap is a lot wider, but the cross section is a lot thicker so we were able to get t he BL^2/Re up to where the older AP REVO was at a 115 N^2/W but with the benefit of having more linear BL. The TC9 motor used here gets a new thicker copper shorting ring and we also switched all our new speakers, including the LMS-R, to stainless formers. This give us a few advantages over our older speakers that used aluminum and titanium including lower distortion and better adhesive bonding respectively. And of course the biggest is our new discrete assembly process. The motor is shipped in a separate box and top assemblies are easier and less problematic to install then they ever were. If you didn't see Thilo's video, it demonstrates the concept quite well: hope that helped
  6. hello guys, tc did file for bankruptcy a few years ago after the audiopulse disaster. TC is and has been back for a few months under the dealer structure. Parts express carries the products online for 10% off MSRP. The new products have actually gone though an extensive overhaul from the the bottom up. We had a drawings portfolio of near 6000+ parts from the 1980's, and 2 years ago we started a new portfolio for the new production line and have about 1000 new or redraw parts for that line and other new designs. Many of the tools have been remade with some minor modifications such as all the spiders, shorting rings and assembly fixtures. We have a very good relationship with our main vendor overseas that has been supplying our parts for 15 years. They are currently the largest speaker supplier in the world. The old assembly process we used to use has been scraped and we invented a new property way to build our drivers that is much more accurate than before as far as gap alignment for our replacement feature - we also changed a number of glues. It was about a 1.5-2 year overhaul right out of bankruptcy. Thilo did buy back all but one of his patents. SS products will be produced shortly under TC's direction using the new parts and assembly processes. Audiopulse brand is no-more, and has been discontinued but still supported by TC Sounds.
  7. 007

    12w7 vs. xcon 12

    80, im gonna be the voice of opposition The W7 is a pretty awesome driver for what it does. I don't think it has a lot of mass, but rather only uses a 2 layer VC. Pretty much everything else is 4 or more and its sensitivity is 86dB which is not bad for a 12 that can truly move 30mm each way. A lot of drivers out there claim high xmax but lack the proper suspension to back it up. Push a W7 down with your hand and you'll notice that the spider is a lot more linear than probably anything else in existence. The W7 would have a lot more BL and sensitivity if they did mass up the voice coil (4 layers) but it would also increase inductance, but that's not why JL used a 2 layer vc... they designed the W7 for sealed boxes and they wanted it to work well for most customers in sealed boxes without the need for EQ so the they needed a high Qes. Believe me if JL was after end all BL product, they would do it. W7 is a much better driver than the W6, i don't really get this whole SQ W6 thing... if that was the case, wouldn't you assume that the Fathom and Gotham used W6's? JL knows what their best diver is and it ends in 7. I have not seen one measurement that shows the W6 has anything on the W7 expect cost. But hey, if JL never sells another W7, id be just fine with that, so please don't get me wrong. I don't think anyone here is gonna run out and buy a W7 from what i said, but i just want people to know that from an engineering standpoint the W7 does not deserve the crap it gets from caruadio enthusiasts. I think that a lot of it comes from overwhelming hype from newbies, so enthusiasts tend to hate it as it is seen as the ultimate newbie boner - believe me i would hate that too.
  8. 007

    Worn out sub?

    Ears dont get use to bass... they just stop working.... i hate to say this, but you're not the first person to experience this and its probably simply hearing loss. You can research treatments, there are some experimental supplement treatments that have been tested on militarily personal (my brother is an army ranger and deals with this all the time) for gunfire hearing loss. There has been good results with a magnesium supplements and some antioxidants too. by best advice is turn it down or take break for several days at a time. goodluck. Best you can do now is prevent further losses.
  9. i noticed he was banned, so i looked at teh source for the msg, what does it link to?? is is bad??
  10. 007

    Ports and Phase

    a port is a resonator and the phase of the overall system changes with frequency, its not discrete. What it sounds like you are trying to do is create a horn loaded system where the driver and horn throat are in phase over a limited passband. This is a very complicated design and if you want to read up on it then try this thread for more clues http://www.diyaudio.com/forums/showthread....p;pagenumber=95
  11. no no, back EMF is usually modeled as a dependent voltage source. I'm not talking bout "Le" here... we're talking about a voltage generated in the voice coil which opposes that of the amp by simply moving the coil thu the magnetic field.. you can physically try this yourself. Its easy: Disconnect your driver from your amp, then take a a short wire and short out your speaker (its easy if its a single coil) Then push the cone down and you'll feel a very high force pushing back. inductance in the TSP sense is simply a magnetic energy stored inside the steel and magnets and even the air (but to a lesser degree) which then as any inductor acts a current source which lags that of the coil which acts on that inductor which is exactly the voice coil. mathematically these two concepts are very different.. for example, the AC non-linear inductor is virtually impossible to solve by hand. 95Honda, im not even goin gto argue this anymore, i only came here to lend some knowledge that bob discovered. If you think BTL's need low voltage to move, then why do people constantly say you need lots of power on then? Its got a BL^2/Re of 250? Good luck with the back EMF... a stiff suspension will not save that.
  12. I guess I don't understand the connection you are trying to make. His white paper has little to do with the bulk of high the efficiency, large motor subwoofers discussed on this site (BTL, Havoc, etc). You also know that Bob has a way with words, right? i was trying to make a connection as to why people tend to reccomend high power amps with subwoofers like BTL's for example. they are very efficent, but of course, also have high back EMF, so if there is not enough voltage, they wont make enough bass. The example is even more dramatic with a 4HP for example...
  13. 007

    Where does everyone get there.....

    p express
  14. let me re-quote myself with character roles and i think what i said will make sense "so many of you get that you need a pretty big amp for a pretty big woofer, but intuitively this makes little sense right?" - narriator "a big motor should in fact be more efficient!" -naive person 1 "[actually] bob explains this pretty well why this is not true..." - narriator more clear? also, a little known fact about his amp, its closer to 600 watts per standards used to measure amps today. And I'm not claiming his sub was efficient.
  15. so many of you get that you need a pretty big amp for a pretty big woofer, but intuitively this makes little sense right? a big motor should in fact be more efficient! bob explains this pretty well why this is not true... http://www.sunfire.com/pdf/woofwhiteall.pdf
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