Special Ebay run of ~ 100 units, grab them while they are hot, here is a link to the seller. They are definitely affiliated with Eminence (ships from eminence kentucky) and is likely due to a cancelled order for an OEM. Note that this is the 4 ohm driver version so plan amplifier power accordingly. http://www.ebay.com/usr/emspeakerman?_t ... 7675.l2559
Also, people have offered as low as 105 a sub and the offer went through, haggle if you want . If I were in the market for building more T60's I'd stock up on a set of 4 for sure (basically half price).
Built
2 x TLAH
1 Titan 39 (lab 12, 15 inch)
1 Tuba 60 (lab 12, 20 inch)
SLA Center
2 x Mini MLTP subwoofers
1 x 212 TH (custom)
2 x Mini-Karlsonators Owned, but not built
2 x Jack 12 (2512, melded)
You're the second one to post this... are you just trying to rub in what a good deal what you guys in the US get.
$210+$100 shipping+$50 import charges
Still decent value, but knowing you 'mericans can get it for just the $210 really smarts. The fact that it is only 4 ohm knocks it out of the running for me. Good find though. I can imagine we'll see some of these in some (heavy-ass) dual cabs soon
If you built 4 T-60s, and ran them series / parallel (ending back at 4 ohms per channel) wouldn't this arrangement enable one to squeeze the best bang for the buck out of some amp channels? I know you can run different configurations of tubas per channel, but at 10 ohm x 2 =5 ohm, so you're losing a few watts there (not sure how this corresponds to volts, though. ) I'm thinking this driver just adds some flexibility / efficiency?
By and large, series and parallel wiring cabs is used for impedance manipulation to maximise the amount of cabs per channel for sure.
It's mostly employed by the big boys (think touring rigs), who usually know exactly what they are doing, to maximise the amount of cabs per channel, to cut down the required amount of amps.
It's often enough said that blowing one driver in a series wiring arrangement will suddenly change impedance, and that may lead to blowing the other driver also in series.
Blowing one driver in a parallel wired arrangement doesn't have this issue.
I reckon one should stay away from series/parallel wiring as small operators.
Yeah it might be a bargain, but utilising it may have it's own risks...
Built:
DR 250: x 2 melded array, 2x CD horn, March 2012 plans.
T39's: 4 x 20" KL3010LF , 2 x 28" 3012LF.
WH8: x 6 with melded array wired series/parallel. Bunter's Audio and Lighting "like"s would be most appreciated...
Rich4349 wrote:Very good point, I hadn't thought of that. Thanks.
Doesn't make a difference if you wire in series. Even with a 45V limit, series wired would double the voltage, or, IOW, a 90V limit!
I know money often seals the deal, but seriously, quality is an investment, not an expense... Grant Bunter
Accept the fact that airtight and well-braced are more important than pretty on the inside. Bill Fitzmaurice
Grant Bunter wrote:It's often enough said that blowing one driver in a series wiring arrangement will suddenly change impedance, and that may lead to blowing the other driver also in series.
Wouldn't blowing one driver in a series arrangement preserve the other driver as current would immediately stop flowing?
. . Of course it would certainly blow the performance when the net result is the same . . no sound!
Grant Bunter wrote:It's often enough said that blowing one driver in a series wiring arrangement will suddenly change impedance, and that may lead to blowing the other driver also in series.
Wouldn't blowing one driver in a series arrangement preserve the other driver as current would immediately stop flowing?
. . Of course it would certainly blow the performance when the net result is the same . . no sound!
TBH, I don't know from experience.
I've seen enough commentary that suggests either of those options could happen, and, you're quite right, no LF sound from that cab or cabs, which could = a show stopper...
Built:
DR 250: x 2 melded array, 2x CD horn, March 2012 plans.
T39's: 4 x 20" KL3010LF , 2 x 28" 3012LF.
WH8: x 6 with melded array wired series/parallel. Bunter's Audio and Lighting "like"s would be most appreciated...
A series parallel arrangement may or may not be dangerous for other drivers given a proper limiting setup.
Scenario: 2 T60, both Dual Lab12 loaded, internal wired in series to increase impedance and double voltage. Cabinets daisy chained in parallel to hang multiple off one amp channel. Processing is set to limit signal level to 90V.
Cab 1, Driver 1 dies, voicecoil blows and opens the circuit. As Hacktomatic noted, series wiring in the cab means power stops flowing to the cabinet. Cab 1 driver 2 goes home functional in a non-functioning cab.
Cab 2 continues cranking along. Since voltage remains constant across the cabinet pair, current flow increases with the drop in impedance via parallel cabinets to increase the wattage output by the amp. When Cab 1 goes out, the impedance increases, current flow drops and voltage remains constant. Output decreases roughly 6db from the loss of wattage and output surface area.
In theory, the limiting should protect cab 2's drivers from excessive voltage if signal levels are increased to compensate for the 6db loss. While it may do that and prevent overexcursion, there's the danger that you'd cause thermal damage. If limited at RMS, the driver should stay alive. If peak limited to give better dynamic output, you may increase the long-term power level and cook the drivers in Cab 2.
But isn't the problem if one driver 'blows' closed (i.e. the wire covering melts and creates a short across the vc). Then you've got a cab that is half it's rated impedance. If the drivers are 6ohms (including the cabinet's impedance), then you've now got one 6 ohm and one 12 ohm cab. The amp will now see 4ohms total impedance instead of the 6 when all 4 drivers are workin - it will therefore be pushing out more current into fewer drivers.
escapemcp wrote:But isn't the problem if one driver 'blows' closed (i.e. the wire covering melts and creates a short across the vc). Then you've got a cab that is half it's rated impedance. If the drivers are 6ohms (including the cabinet's impedance), then you've now got one 6 ohm and one 12 ohm cab. The amp will now see 4ohms total impedance instead of the 6 when all 4 drivers are workin - it will therefore be pushing out more current into fewer drivers.
If you are talking about the voice coil lacquer coating going south creating a short in the coil in a series wired cab, yes the the 2nd driver could have more current going through it depending on where in the coil the short occurs. And although I suppose that could happen, 99% of the time a coil is gonna open before it shorts.
Then again, maybe it shorts right before it opens . . .
so if it blows open, where is the danger to the 2nd driver (in series)? I thought series always had the danger that if you blow one driver, you blow the other. And I got that idea from here... so it must have some modicum of truth behind it!
. If I were in the market for building more T60's I'd stock up on a set of 4 for sure (basically half price).
