Bill Fitzmaurice

[quote name='paul h' post='1260419' date='Jun 7 2011, 05:24 PM']Slightly tangential but my guitarist doesn't like the sound of my Neutrik/VDC cables. They have less top end than his cable of choice.[/quote]Cables with excessive capacitance roll off highs. An engineer would call them defective; Monster calls them Bass Cables and charges a premium price. There's almost no correlation between cost and capacitance. [quote]They also have less top than my Planet Waves cable. I however prefer them for that same reason.[/quote]All you gain with high capacitance cables is a lower signal to noise ratio; that's not a plus. Want less highs? Turn down the high EQ on your amp, that's what it's there for, and so doing increases the signal to noise ratio. [quote]As for cables, I seem to recall certain 60's guitar gods using the long coily items without complaint:[/quote]They had gosh awful capacitance, and rolled off highs horribly. We used them anyway, being less than knowledgeable about what capacitance was, and just accepted the loss of highs for the convenience.

[quote name='Subthumper' post='1259144' date='Jun 6 2011, 06:44 PM']Not to mention the feeble wire often found lurking inside amps going from the pcb to the o/p jacks/speakons.[/quote] Still considerably more robust than the wire of the driver voice coils, which is what matters. If the cab contained more than a couple of feet of wire, or the amp more than a few inches, then it would be a different story.

[quote name='gafbass02' post='1258372' date='Jun 6 2011, 08:52 AM']Should/would popping the drivers out and re-wiring with the same obbm klotz stuff I use from head to cabs be a good plan do we think? Gaf[/quote]No, a waste of both time and money. [quote]We keep hearing how we should use decent speaker and instrument leads, yet the leads in the cabs that i have seen do seem pretty cheap.[/quote]Price is not an indicator of quality, and within the confines of a cab durability is hardly a concern.

[quote name='alexclaber' post='1258097' date='Jun 6 2011, 04:35 AM']If anyone thinks their bandmates are so clumsy that a tall stack will be knocked over... Well I can't see any band like that managing to get through a whole song without a cacophony of upended cymbal stands! [/quote] +1. It's a very lame argument, really, a 2x10 stack is no higher than an 810, while taking up less floor space than an 8x10, or for that matter a horizontal 2x10.

[quote name='Happy Jack' post='1257790' date='Jun 5 2011, 04:03 PM']Wow! Eight posts in before anyone mentions "combing".[/quote] Why would they? Vertically aligned drivers don't comb.

[quote name='alexclaber' post='1253585' date='Jun 2 2011, 04:49 AM']I'd take most sensitivity specs with a whole bucket of salt! [/quote] More like a lorry load. Doubling power gets you 3dB. Doubling your cab count gets you 6dB with the same amp. Unless your amp is severely underpowered, as in 1/4 or less than the power rating of your speakers, adding a second identical cab will usually be the better route.

[quote name='OzzyGreg' post='1256177' date='Jun 4 2011, 02:46 AM']. Guys, I'm not real handy with speaker box design software, I'm very much a beginner. I have just used WinISD to calculate the design of a new 15" bass cabinet I want to build using an old Etone 461 bass speaker I have lying around here. The speaker's parameters are, according to Etone: Fs : 35Hz Vas: 253 Qms: 6.1 Qes: 0.34 Qts: 0.322 PMax: 250 W (RMS)[/quote]Those specs alone are insufficient to determine driver suitability. Also required is xmax, to know the displacement limited power handling, and an SPL chart, for midrange response. Unfortunately Etone doesn't publish either xmax or SPL charts, so a proper simulation is not possible.

[quote name='Subthumper' post='1246754' date='May 27 2011, 05:21 AM']Was wondering if it would be any good in the BFM omni 15 cab.[/quote] Yes.

[quote name='fryer' post='1242562' date='May 24 2011, 02:11 AM']Thanks Bill, and all. But I do like the sound of the Peavey cab, and prefer it to the sound to my Epi UL 410. What makes the sound though - is it the speakers or the box ?[/quote]Both. But in this case mainly the drivers, which have a high Qts that results in a pronounced midbass response peak. It's not my response cup of tea, but if you like it all well and good. [quote]If I made a new cab from ply, to the same internal dimensions, with the Sheffield speakers, would it sound the same as it does now ?[/quote]Properly built with cross-bracing and internal damping, probably better.

[quote name='reggaemaster' post='1242353' date='May 23 2011, 05:07 PM']Thanks for the info, but will the fact that there is more power running to the the 2 110's make any difference?[/quote]Not if they lack the displacement to use it. The average ten runs out of excursion at about 100 watts. [quote]Epis are 99db. GKs, depending on which model are either 100db or 101db[/quote]Only in the imaginations of their respective advertising department schlockmeisters.

Volume is limited by the displacement of the drivers. The average twelve has more displacement than the average ten, so a 2x12 will usually have more output capability than two 1x10s. I say usually, as a particular ten may have more displacement than a particular twelve. Unfortunately manufacturers won't tell you what the displacement is of the drivers they use.

[quote name='deepbass5' post='1240034' date='May 22 2011, 04:38 AM'][b]No don't do it[/b] is the answer these mass produced cabs are made from fairly cheap light weight stuff anyway[/quote]Au contraire, price point gear like Peavey tends to be made from thick heavy materials with un-braced construction, as that's the most inexpensive method. I suspect this is made of 18mm MDF or the like, as the Sheffield tens only weigh 1.8kG each. Build of well braced 12mm plywood it's possible to reduce the cabinet weight by at least 15kG. But I wouldn't. The Sheffield drivers are mediocre quality, and the 4x10 format is perhaps the worst possible for an electric bass cab. If the OP has the skills to duplicate the Peavey cab he has the skills to build a pair of 2x10s, which will work better, and they could be loaded with far better drivers than the Sheffields.

Mine are whatever sounds best in the room I'm in. Since every room is different acoustically my settings are different in every room .

[quote name='JPJ' post='1228081' date='May 11 2011, 04:27 PM']At coppers short of £300 including delivery they weren't a cheap upgrade[/quote]If you plan to get more do so yesterday, that's a silly low price considering what's happened to the price of neo drivers in the last 6 weeks.

[quote name='Bloc Riff Nut' post='1226365' date='May 10 2011, 11:10 AM']I think my thread will get a more positive response on TB [/quote]Or not. They're also sensible enough to know that the only thing that differentiates heavy gear from lightweight is that heavy gear weighs more. [quote]BUT..I have recordings of a 1x15/210 config over 2x1x12's and the sound of the latter does me fine atm[/quote]Moot. All that proves is that you prefer one recording to another. A recording is only as accurate as the gear it was recorded with and listened to on.

[quote name='JPJ' post='1225198' date='May 9 2011, 10:30 AM']Fair point I think what I meant to say was the difference between the stock PAS speakers and the DeltaLiteII's [/quote]That would probably be significant. The PAS being OEM are probably not high quality, and being ceramic are an old and probably obsolete design.

[quote name='JPJ' post='1224886' date='May 9 2011, 06:08 AM']I should get a really interesting 'real world' comparison between neo and non-neo speakers.[/quote]Aside from weight there is no difference between neo and non-neo drivers. There are differences between various drivers, but those differences are not the product of the magnet material.

[quote name='Mr. Foxen' post='1224479' date='May 8 2011, 03:30 PM']Depends on the speaker. The cab has to be tailored to the speaker. Throw up what they are, and a bunch of loudmouth internet know-it-alls will give suggestions.[/quote] More to the point choose the cab design based on your needs, use a driver suitable for it.

A loud popping is either the amp running out of headroom or the driver voice coils hitting the back plate. Neither is recommended. The cab wattage rating is irrelevant, few cabs can make use of more than half their rated power, and if pushed to full power the drivers may very well bottom out. I would not bridge the amp. 225w/8 ohms per channel is all your cabs need, so run dual mono. All that you're accomplishing with bridging is doubling the voltage swing, which doubles the likelihood of damaged drivers.

[quote name='Stompbox' post='1224336' date='May 8 2011, 01:29 PM']Following on from my earlier post, I'm acquiring a pair of 15" bass drivers - now I'm thinking about building a 2 x 15" vertical cab. How about one that will clip together (but have an open base on the top cabinet, and an open top on the bottowm one, if you see what I mean,) so as to make it more portable? Hmmm... [/quote]Just make two 1x15.

[quote name='JPJ' post='1224066' date='May 8 2011, 07:45 AM']Thanks for that, more or less confirmed my thoughts/fears about the neos so it looks like Delta's it is.[/quote]Model them both in WinISD Alpha Pro, look at the maximum SPL chart, and you'll see the Delta is an also-ran. Even the Basslite S2010 beats it, let alone the 2510.

[quote name='mcnach' post='1222580' date='May 6 2011, 03:49 PM']For gigs I often use a 410 with a 210 on top... I think I will try putting the 210 vertically next time and see what happens... would it make sense to align the speakers with the ones below... or not really bothered? [/quote] It may work better, hard to say, as the setup is already knackered by the horizontally placed drivers in the 410.

[quote name='gusthebass' post='1220622' date='May 5 2011, 04:05 AM']the line itself has to have the cross sectional area of the cone at the speaker end to avoid pressure changes[/quote]It doesn't, just as a reflex port does not have to have the area of the cone. [quote]with wadding you can slow the speed of sound[/quote] Not enough to make any difference. TLs are very misunderstood, and it doesn't help that there are many proponents of so-called mass loaded TLs that aren't TLs at all, they're tall skinny bass reflex cabs. It's all in the impedance. A TL has a single impedance peak, just like a sealed cab. If the cab has dual impedance peaks it's bass reflex. [quote]These may be great speakers but I wish people would be honest[/quote]Truth in advertising? What a novel concept.

[quote name='Phil Starr' post='1219241' date='May 3 2011, 04:57 PM']the easiest one to answer is your transmission line question. Although there are some technical controversies over these the whole point is to absorb the rear pressure and to stop it reflecting back to the speaker so you lose all the energy from the rear of the speaker and you have a decent mass of air in the line. Transmission lines promise lower resonance and smooth low end response with good transients but low efficiency.[/quote]Transmission lines are 1/4 wavelength resonant pipes. The 1/4 wavelength resonant frequency coming out of the terminus acts much like the port in a bass reflex. The line is stuffed with damping material to suppress the harmonics of the pipe frequency. The advantage to a TL is that below the pipe frequency response rolls off at 12dB/octave, like a sealed cab, rather than the 24dB/octave of a bass reflex, so you get sealed cab 'tightness' with reflex efficiency. The downside is that they need that 1/4 wavelength pipe, which is 5.7 feet for 50 Hz, 7 feet for 40Hz. They're just too big to be practical for electric bass.

[quote name='dan670844' post='1219010' date='May 3 2011, 02:08 PM']He its not a new idea WEM where doing it in the 60's and also had double angled cabs with 6 drivers in but they didn't catch on prob didnt look cool even though they where most def better than all the other crap and the time....................[/quote] The proof of concept can be seen in St.Pauls in London; the original installation was done in 1949. Acoustical engineers knew that was the right way to do multiple driver cabs for a decade prior to that. Needless to say Leo Fender and Jim Marshall were not acoustical engineers.