Bill Fitzmaurice

[quote name='Chopthebass' timestamp='1496070973' post='3308520'] I remember having a better experience at this venue with my two Jack 12's[/quote]Probably because the Jacks are much more sensitive in the lower mids than commercial cabs, and those lower mid frequencies are above the band width where null zones occur.. [quote]My GK cabs are the wedge shaped ones, so if I angle them will the crowd still hear them ? [/quote]They'll hear the lows that you don't. The mids and highs, maybe not, especially as they have rather poor dispersion in the mids and highs to begin with.

[quote name='Jack' timestamp='1496059700' post='3308428'] It's electrically the same as having a thicker cable, so if anything your amp would have a minutely easier time of it. [/quote]If anything the lower resistance of dual cables would lower the overall impedance load, and that might make things harder on the amp. OTOH if the cables are undersized to begin with the lower resistance could lessen insertion loss, and that would ease the load on the amp, so it could work either way. Then there's the scenario if the amp has dual power amps, ala the Ashdown Superfly for instance. Plugging both into a single cab with parallel jacks could fry a 'Fly. I don't know what the LM III configuration is, but the possibility for damage does exist. [quote]after having some numpty at a gig borrow my gear [/quote][i]That's [/i]the source of the problem. If I do let someone sit in I have one rule: don't touch the amp. If they don't like the way it sounds that's their tough luck for not bringing their own gear.

You were standing in a null zone. http://billfitzmaurice.info/forum/viewtopic.php?f=10&t=999 Moving the cab and/or your position can help. Since you can't hear lows when you're in a null zone it's critical to have the cab either elevated or tilted back so you can hear your mids.

[quote name='DIYjapan' timestamp='1495931610' post='3307648'] most people on here are recommending tube ports. [/quote]I didn't. You may find these threads interesting, including the builder's choice of finish: http://billfitzmaurice.info/forum/viewtopic.php?f=30&t=24323 http://billfitzmaurice.info/forum/viewtopic.php?f=13&t=24354

[quote name='Jus Lukin' timestamp='1495819948' post='3306897'] Money- no longer worth it's weight in burgers! [/quote]I'm sure they're no longer like that. The reason: credit and debit cards. Before the barriers went up fast food joints were easy marks, and cash heavy, as that's what everyone paid with. Nowadays cash is a thing of the past. Banks were less likely to be robbed, having armed security guards. You never saw Ronald McDonald packing heat.

[quote name='Jus Lukin' timestamp='1495817800' post='3306874'] I seem to remember drinks and tickets​ were dispensed through a hatch- perhaps the missing part of the rectangle housed the office and storeroom! [/quote]Years ago in some of the seedier sections of New York City, and I'm sure other cities as well, there were bullet proof perspex dividers over the counters at McDonalds and other fast food shops, where the orders were passed through small revolving doors. Banks in the same neighborhoods had less security.

[quote name='Balcro' timestamp='1495818332' post='3306883'] Downloaded that latest version of winISD from the facebook link and the home-page, but Norton Anti-Virus took umbrage with it on both occasions. Something called Heur.AdvML.C was identified and it was removed to the vault. [/quote]It's a Norton issue. See: https://community.norton.com/en/forums/heuradvmlb-detected-false-positive-or-not I have Windows Defender, Super Anti Spyware and Malwarebytes, none have any issue with it.

I see you're using spline braces on the box sides. Spline braces are better than no braces, but barely. Panel to panel braces are far more effective, and allow you to build a cab from 1/2"/12mm plywood for a lightweight cab. I also don't care for slot ports. Corner ports in all four corners work better, and they have the advantage of bracing the top, bottom, sides and baffle. As to the math, no one does math anymore. Download WinISD 0.7: https://www.facebook.com/WinISD/posts/126113234166443

[quote name='Phil Starr' timestamp='1495646885' post='3305611'] It's a cultural thing Bill, a lot of our pubs are in very old buildings [/quote]I know that pubs tend not to be on the dimensions of the Royal Albert, but 10x15 feet? Meters yes, but feet? My car wouldn't fit in a garage of that size.

[quote name='cheddatom' timestamp='1495637460' post='3305511'] There's a pub I've done a few times, the room we play is probably 15ft long, 10 ft wide. [/quote]My living room is larger than that. Maybe I should start charging my guests for their drinks? I can't imagine a room that small being able to pay me enough to leave the house. As for subs, read what I actually posted. Low tend to make their way throughout the room no matter what its size. It's the directional mids and highs that need spreading about.

[quote name='cheddatom' timestamp='1495629316' post='3305411'] I'm talking about very small pubs. I have an extra heavy beater for the kick drum, and I actually have to take it easy on the snare to get the mix right [/quote]I run everything in the PA no matter the size of the room. The difference is akin to listening to a small table radio versus a decent stereo system. Management might not care about how it sounds, the audience might not care about how it sounds, but no matter. I care about how it sounds.

[quote name='cheddatom' timestamp='1495544467' post='3304606'] I play in an originals band that still manages to get the odd pub gig where we take our own PA. For these, the bass never goes in the PA, but neither do any drums [/quote]It's actually important to put drums in the PA, the snare in particular. Even a ham fisted troglodyte's snare doesn't carry all that well throughout most rooms. Having the bass in there as well doesn't hurt, but not for the lows that carry well, for the mids and highs that don't. Just be sure to high pass the channel at 100Hz and/or roll off the bass EQ so it doesn't stress the PA. The same applies to guitar, for the same reason. It's not about volume, it's about dispersion.

[quote name='citymariner' timestamp='1495484753' post='3304164'] [i][size=3][color=#333333][font=Oswald, sans-serif]"The [/font][/color][b]Standard 104HR[/b][color=#333333][font=Oswald, sans-serif].... puts out impressive power at 800 watts[/font][/color][/size][/i] Is MarkBass talking crap? [/quote]Big time crap. For starters, speakers don't put out power.

[quote name='grandad' timestamp='1495185446' post='3301907'] The conflict in my mind is between the larger speaker = narrower beam, smaller speaker = wider beam, which in my experience behave the opposite. Theory states that the larger the source compared to the wavelength the more narrow or directional the beam. What am I missing here? [/quote]It's not theory, it's law. Use this to illustrate: http://www.acoustics.salford.ac.uk/feschools/waves/flash/diffractionslider.swf Dispersion is why tweeters are smaller than midranges, midranges smaller than woofers. [quote]On reading over the above it sounds rather text-bookish[/quote]The behavior of sound waves isn't intuitive, because unlike light waves we can't see the result.

[quote name='CameronJ' timestamp='1495006825' post='3300295'] why is it that I've never seen a 4x10 cab which comes constructed this way? . [/quote]Because it wouldn't sell. People buy what they're used to seeing, and that's a standard 4x10. In any event, a pair of 210s is more practical, from the standpoint of cartage and the ability to leave one at home when you don't need it.

[quote name='EBS_freak' timestamp='1494942351' post='3299794'] bass is going to be be fairly well heard (assuming you have enough power) because[b] it's omnidirectional.[/b] [/quote]Only below the point where the baffle is one wavelength across, ie., the baffle step frequency. With a typical 410 that's at about 500Hz. Above that dispersion is at best 180 degrees. Then there's the matter of the cone diameter. Above where it is one wavelength dispersion rapidly narrows. With a ten that's above roughly 1.6kHz. Put those two tens side by side and the dispersion is more than halved compared to with one, and we haven't even touched on comb filtering, which occurs above where the driver center to center distance is one wavelength.

[quote name='BigRedX' timestamp='1494926138' post='3299567'] Apart from bassist who regularly play decent-sized rooms without PA support... [/quote]IME that description applies to at least 80% of bass players. Besides, having a rig with good dispersion doesn't require jumping through multiple hoops, so why not?

[quote name='Lozz196' timestamp='1494167322' post='3293731'] Any ideas - [/quote]His first mistake was to lend his gear. While an SS amp isn't bothered operating with no load, it can be death to a number of components in a valve amp. To that end many have a switched output jack, so that if there's no load the output transformer secondary is shorted. One wouldn't expect damage to occur in a matter of seconds, but anything's possible.

One cab solution? IMO any cab worth having should be a 'one cab solution', unless it's a compact cab that can't go loud enough. If that's the case use two.

[quote name='DangerDan' timestamp='1493991921' post='3292454'] So i should ignore the "bridged rating" printed on the back of my amp? [/quote]Ideally you should ignore watts entirely, as in and of itself the power rating is almost meaningless. What determines speaker performance is voltage swing. But speaker manufacturers aren't exactly in a race to provide maximum displacement limited voltage swing ratings for their cabs, nor do amp manufacturers even mention volts, other than what's coming out of the wall outlet. The technical data provided to purchasers of light bulbs is far more comprehensive.

[quote name='DangerDan' timestamp='1493987551' post='3292397'] im worried about pushing half my amp hard (im running the amp at 2 o'clock on the volume dial) when using it in "stereo" mode, compared to using roughly half the amps power in bridged mode [/quote]You should seldom, if ever, use bridged mode, unless you have 16 ohm speakers. http://billfitzmaurice.info/forum/viewtopic.php?f=10&t=19292

[quote name='EBS_freak' timestamp='1493982609' post='3292339'] Don't powersoak/attenuate a SS amp. [/quote]+1, they should only be used with valve amps, guitar amps at that, to allow over-driving the power amp valves. If you're concerned about pushing a 2x10 too hard add another one.

[quote name='SH73' timestamp='1493847182' post='3291311'] Looks like I need an empty 412 enclosed cab then. [/quote]IMO that would be your second mistake. The EVM is not at all suited to a sealed cab, unless it's being used for guitar. If you must use them, and I only would if I had them on hand, it should be in a ported cab of at least 8 cubic feet. Even then four EVM12s will be limited to a maximum SPL of 126dB at 80Hz. That's all well and good, until you consider two Eminence Kappalite 3012HO in a 4 cu ft cab will do the same.

You can use a guitar cab with bass, but it's not going to have the lows that a bass cab does.

They're PA tops, meant to be used with separate subwoofers handling the lows. They're not going to work well with bass.