Bill Fitzmaurice

[quote name='tomtraubert' post='1020029' date='Nov 11 2010, 08:34 AM']any thoughts on why they aren't more popular?[/quote]Too big. Get a pair of 2x12 instead.

[quote name='stevie' post='1015105' date='Nov 7 2010, 06:28 AM']A vertical column is quite often not the best way of arranging multiple drivers, particularly bass drivers.[/quote]One can run drivers horizontal so long as their center to center distance is less than one wavelength within the pass band. This basic law of acoustical engineering is almost universally ignored by the electric bass cab industry. (I doubt most manufacturers are even aware of it.) Drivers offset on the diagonal can sometimes come close, though.

[quote name='machinehead' post='1012814' date='Nov 4 2010, 08:44 PM']If they're using the Kappalite 3012HO or a driver of equal spec[/quote]They aren't. Its a 2512 motor.

[quote name='ThomBassmonkey' post='1014312' date='Nov 6 2010, 10:41 AM']why make a vertical 4x10 which would stuggle to be transported when most people (myself included) would go for 2 2x10s[/quote] My preference would be for the two 2x10s, but there are those who prefer a high cab that's essentially its own dolly for wheeling about, and don't mind the weight when stairs are encountered. For them a tall 4x10 would be the ticket, but I wouldn't hold my breath in anticipation of ever seeing one. An option would be a pair of dedicated 2x10s with wheels on one, a top handle on the other, and clamps to tie them together for wheeling about. The clamps would also ease concerns about stability on stage.

[quote name='Protium' post='1013803' date='Nov 5 2010, 06:08 PM']Or because no one has space to store or transport a seven foot tall 8x10 [/quote] Modern driver technology allows for a vertical 4x10 to perform as well as an 8x10. No one makes one because 'it wouldn't look right'. A pair of good vertical 2x10s is very much the same thing anyway, but note the comment by the previous poster being concerned about how they look without a word mentioned about how they'd sound. Ask Alex about the sales resistance he gets because his cabs don't look like they came from the same cookie-cutter mold that most cabs have since 1959.

[quote name='Alien' post='1013397' date='Nov 5 2010, 11:18 AM']AFAIK, the TNT150 was fitted with either a Scorpion or a Black Widow as standard, depending on the year. I'd have said yours looks to be a BW. A[/quote]Looking more closely the driver has squared edges. BWs have a round frame, as do the Blue Marvel(low end Eminence OEM, actually), so it's probably a Scorpion. If it is the same as the current SP-15825 it's a fair enough driver, but not worth putting into a fEarful or Barefaced type of box. It would work OK in an Omni 15, but with 3.1mm xmax is only good for 150 watts, so it would be a limiting factor in the long run.

[quote name='Rich' post='1012899' date='Nov 5 2010, 03:48 AM']I used to run 1x15 + 2x10. I swapped the 2x10 for a second 1x15 and now the sound is bigger, louder, more everything. Far better.[/quote]If you'd swapped the 1x15 for a second identical 2x10 you might have had the same result. Some mixed cab combinations work well together, some don't, and there's no way to predict it. Identical cabs will always get along well. OTOH some cabs are crap to begin with, so using two is still crap, just more of it. [quote]You mean stacking the 2x10s on their narrow ends? Anyone ever done this and not worried a bit about how wobbly it looked?[/quote] Drivers should always be vertically arrayed. It might not have a conventional look, but what looks best and what sounds best seldom coincides. Manufacturers concentrate on creating what sells best, and that's what looks best.

[quote name='Big Mick' post='1012693' date='Nov 4 2010, 06:42 PM']Hmm, interesting observation Bill. Can you expand on the reasons for your advice (I'd like to know as if the driver is still useable, then a new one is a major expense). Cheers, Mick. [/quote]Building a well engineered cab is a lot of work. IMO it's a shame to get less out of a good cab than its capable of giving by using inferior drivers.

AFAIK the TNT uses a Blue Marvel driver, which is OK for a combo, but I wouldn't put it in anything else.

[quote name='4 Strings' post='1012207' date='Nov 4 2010, 11:53 AM']That seems huge to me, if one imagines the cone moving 32mm each way.[/quote]It doesn't. The voice coil diameter is 3 inches. Excursion is probably in the vicinity of 4 to 6mm.

[quote name='4 Strings' post='1012226' date='Nov 4 2010, 12:04 PM']Should I bother anyway?[/quote] No. There isn't enough difference in the response of the two cabs to justify it. All bass cabs are full range, quite different from better PA cabs that are designed to operate within distinct bandwidths.

[quote name='ThomBassmonkey' post='1011719' date='Nov 4 2010, 05:42 AM']All things being equal (in terms of sensitivity etc) and a 15" will produce more volume than 2 10". It's never that simple though. I prefer 10" speakers though, so it's a no brainer for me, I'd rather have the sound I preferred than a tiny bit more volume. [/quote]+1, and 'tiny bit' hits the nail on the head. Using a pair of tens versus one fifteen, with the same excursion and fed with the same power, the fifteen might go 1.5dB louder. That's inconsequential.

[quote name='JPJ' post='1011766' date='Nov 4 2010, 06:16 AM']Main stream equipment suppliers seem to ignore Hoffman's Iron Law Am I right in assuming that the Thump is compromised and is making up for it with sheer power (1000w 'rating')?[/quote] The Thump is compromised, and the 1000w rating is 'peak', not RMS. With an F3 of 50Hz it doesn't even qualify as a true subwoofer, that being the result of a cab that's too small to go both loud and low. Hoffman will not be denied. With a premium long excursion driver one can use high power to overcome the limitations of size. But the Thump isn't loaded with a premium long excursion driver, and 500 watts RMS isn't high power where subs are concerned. Not that it doesn't serve well enough considering its size and price, but it hardly lives up to its overblown advertising. To be fair, though, not much does.

[quote name='keeponehandloose' post='1011306' date='Nov 3 2010, 04:22 PM']A single 15 pushes more air than 2x10s ,as it has more surface area,so 2x10 + 1x15 should seem louder[/quote] Surface area is a two dimensional measurement. Drivers operate in three dimensions. The other comments by various posters all have some merit, but none are definitive as, to repeat, driver size alone is insufficient data. But if it was me I'd run a pair of 2x10s, the drivers vertically arrayed.

[quote name='xgsjx' post='1011274' date='Nov 3 2010, 03:53 PM']Been answered many times. 2 2x10 8 ohm cabs will be considerably louder & better quality than 1 4x10 4 ohm. Have a look in the Impedance sticky, especially the last couple of pages.[/quote]Assuming the same drivers, same cab volume per driver and same tuning two 8 ohm 2x10 will be identical in output to one 4 ohm 4x10. The only difference is dispersion. If the two 2x10s are vertically stacked they will have twice the dispersion angle as one 4x10. But the OP asked about one 2x10 plus one 1x15 compared to one 4x10. The answer is that one can't say, insufficient data. It would likely be close.

[quote name='4 Strings' post='1011103' date='Nov 3 2010, 01:26 PM']Sensitivity is not such an issue nowadays with power coming cheap, so this would seem a good compromise (and one of which I would love to take advantage but they are so expensive!) but do you get such a deep and powerful tone?[/quote]Power is cheap. Drivers that can make use of it, not so much. And that doesn't mean watt ratings, which are next to worthless. It has to do with excursion, and the usual sources do not use high excursion drivers.

[quote name='rodl2005' post='1010290' date='Nov 3 2010, 01:31 AM']There's a web site called Send it on.com or sumthin' which enabled U to buy something in the USA- have the seller send it there & THEY send it to you- for the SHIPPING price- & coz their a large Co. (or handling large amounts of freight) they can offer the similar shipping costs of the larger retails stores that DO ship internationally. I think you JOIN up with them - for somethin' like $8 US All this is AFAIK.[/quote] Third party shippers are a method to get the full kit including Eminence from Leland. It's noted here: [url="http://billfitzmaurice.info/forum/viewtopic.php?f=14&t=9905&sid=8078ac451297146fb5af0c47f534da8a"]http://billfitzmaurice.info/forum/viewtopi...5af0c47f534da8a[/url]

[quote name='4 Strings' post='1010352' date='Nov 3 2010, 04:26 AM']I wonder if this is the same here, smaller boxes can mimic with ever increasing accuracy but there's no substitute for volume. Even if small cones can be made to work a lot of them will be needed.[/quote]The performance triad is cabinet size, sensitivity and low frequency extension. Any one or two may be compensated for by alteration of the remaining. If one desires a small cab that goes low the odd man out is sensitivity, which may be compensated for by higher power input. But that requires a driver capable of making use of said power, and an amp capable of delivering it. Both of those can add considerable cost. The least expensive solution comes with a larger driver(s) and larger cab, but then you need the means to carry it to the gig. What remains a constant is that there's no such thing as a free lunch.

[quote name='Brave Sir Robin' post='1010231' date='Nov 2 2010, 08:12 PM']Just entertaining a thought, but from a purely mechanical point of view, a bigger cone will certainly make a bigger displacement easier, and will move a lot of air by itself relatively easily. Unless your small cone design has some funky engineering allowing it to move back and forth a lot without shredding itself to pieces. Hence my point regarding how easier and cheaper it is to produce a large speaker than an array of small, high quality, higly durable 10'' speakers. Or then again, I could be wrong.[/quote] The cost per cc. of displacement does go down as the size of the cone goes up. But as already noted larger cones are generally accompanied with less high frequency extension, and are always accompanied with narrowed dispersion, so there is a point of diminishing returns. IMO there's no advantage to going larger than a fifteen, and I wouldn't even use a direct radiating fifteen on its own without a midrange driver, due to the midrange beaming issues with a fifteen.

[quote name='Brave Sir Robin' post='1010201' date='Nov 2 2010, 07:37 PM']I've always understood it is much easier (and cheaper) to get powerful ultra low frequencies with a large speaker, at the expense of poor higher frequency response. Not really an expert, but I'd love to hear an expert opinion about the qualities of large speakers vs small speakers for reproducing low frequencies at high volumes.[/quote] Driver size in and of itself is moot. Where low frequency output capability is concerned what matters is driver displacement, sensitivity and frequency response. Those are related to driver size, but only anecdotally.

[quote name='woodster909' post='1007056' date='Oct 31 2010, 06:06 AM']no delivery service straight off their website, but UPS will do a pick up and deliver freight service. I'd image others too like FedEx[/quote]The Jack flat packs aren't terribly large or heavy, so shipping shouldn't be all that bad. But the packs are normally not sold without drivers and other parts, and SH can't ship Eminence overseas. You'd have to contact Leland at SH directly to get the packs without the Eminence part of it.

Clean them with a damp rag. So long as you don't soak the cones they won't be bothered.

[quote name='RickIronWitch' post='1002509' date='Oct 27 2010, 09:30 AM']500watts together? Cheers[/quote]Neither. Assuming your amp has a volume control you can use any power rated speaker with it. If the speakers distort turn it down.

[quote name='LukeFRC' post='1001415' date='Oct 26 2010, 12:29 PM']new! sure looks like a cutting edge design to me![/quote] If you like that you'll love this: And would be willing to pay 200,000 quid for a reissue!

[quote name='bigevilman' post='1000216' date='Oct 25 2010, 12:14 PM']I want to put a new speaker in there as 250 watts rating ain't nearly enough![/quote] The thermal rating is moot. Output is limited by displacement (T/S spec Vd).