Bill Fitzmaurice

[quote name='Zummerbass' timestamp='1509898054' post='3402414'] Do I get a PC 210t [/quote]If you like what you have but need it louder add another identical cab. [quote]Or another RS cab? 115 or 212. Heavier but well matched. [/quote]Well matched cosmetically, but otherwise, no. To be acoustically well matched is to be identical.

Speakon connectors are made in two, four and eight-pole configurations. The two-pole cable connector will mate with the four-pole panel connector, connecting to +1 and −1; but the reverse combination will not work.

[quote name='discreet' timestamp='1509643382' post='3400573'] I think you're right - you have the knowledge BIll, how about a short post on driver substitution and I'll get a mod to make it sticky? [/quote]I'd only do so if the topic was locked. Back when I still frequented talkbass they asked me to explain how driver phase response affects mixing cabs. It turned into a complete clusterf*ck when the usual bunch of idiots decided to fill the thread with Luddite nonsense. If the topic had been locked, or if the mods had done their jobs and cleared out the detritus, it wouldn't have given me one more reason to leave there. Lesson learned. To do it right would take a fair amount of time, which I'd only invest if I was assured that it wouldn't turn into an endless debate.

I think the need for a sticky that explains what it takes in terms of the tools and knowledge required to successfully substitute drivers is long overdue.

The 2510 has more xmax. Low Qes chokes off bass response, 0.30 is as low as you want. But don't expect miracles, 17L is less than half what you need for best results. Long wavelengths at high levels don't come out of small cabs.

Since you have the specs on the original you just need to match those within 10% to determine if another driver is compatible, except for xmax. At 2mm it isn't even mediocre. 4mm is the least you should consider. I'd use the 2510 myself. As for the 3010MB the Qes of 0.21 rules it out as a bass driver.

You would not high pass higher than 50Hz, and it would have to be an active filter, not passive. The Thumpinator is one example.

[quote name='TheRev' timestamp='1509176748' post='3397111'] I have used cabs (usually 4x10s or 8x10s) at festivals where the notes all seem to run together, with the result that I can't really hear what I'm playing.. My 4x5 sounds clearer and more articulate to my ears [/quote]That can be chalked up to the better upper midrange response and dispersion of the smaller drivers. It's why some cabs are now made with larger woofers for the lows and smaller midrange drivers for the mids. PA and hi-fi cabs have used that arrangement since the 1950s. Bass cab manufacturers, and bass players, are slowly coming around.

The cone diameter isn't the same as the frame size. Even with the same frame size the cone area, T/S spec Sd, differs from driver to driver. There are some fives where four of them will have the same, or even more, cone area than some tens, but by and large they won't.

[quote name='Dandelion' timestamp='1508845794' post='3394784'] Providing a guitar head is used. Is the fact that it is tuned differently going to make it sound crap? [/quote]There's far more to it than tuning. Guitar drivers extend much higher in their frequency response and have short xmax, which causes them to distort at low power levels. [quote]Fender Bassman 410 combo's have been used by guitarists for many years.[/quote]That would be a reference to the '59 Bassman, and reissues of it. It's a great guitar amp because it used guitar drivers in an open back cab. By the same token what made it a great guitar amp also made it a horrible bass amp. The original was only produced for three years. [quote]Acoustic guitars sound esp good through a bass amp [/quote]If it has a tweeter true, as a guitar amp without tweeters loses a full octave or more of the harmonics of the acoustic guitar. But tweeters sound horrid with a heavily distorted electric guitar tone, explaining why guitar amps don't have tweeters.

Going from 500w to 650w won't make any difference. Depending on the tuning frequency of the cab chances are that the amp is putting out [i]less[/i] power at 40-45 Hz than at 50-55Hz, because the impedance will probably be higher at 40-45Hz than 50-55Hz. Excursion with equal voltage input is probably considerably higher at 40-45Hz than at 50-55Hz, and that's the likely source of the problem.

[quote name='TheRev' timestamp='1508663331' post='3393570'] its a BigE/MAS45, which has pretty high excursion drivers. [/quote]Long excursion maybe, but they're still only 5 inch drivers. Four of them have less cone area than a single ten.

[quote name='TheRev' timestamp='1508592587' post='3393164'] Will I even notice the difference between 500 and 650w? [/quote]No. You need to double the power to get 3dB of additional headroom, which isn't all that much. Besides, nine times out of ten what you describe is caused by your speakers running out of excursion capacity.

After all the toil and trouble you Brits went through to defeat Napoleon you go and adopt his system of weights and measures, and relegate good King Henry VII to the dust bin. What's next for you? Drinking cold beer?

Obviously? Watch this: https://www.youtube.com/watch?v=YFKT4jvN4OE&feature=youtu.be

[quote name='radiophonic' timestamp='1507814958' post='3388157'] Fender Performer Cab. 4 x 10. 150W Apparently. [url="https://www.musicgoround.com/p/640363/used-fender-performer-cab-410-guitar-speaker-cabinet-4-x-10"]https://www.musicgor...-cabinet-4-x-10[/url] [/quote]The drivers are Eminence, produced in the 14th week of 1987. The only 4x10 Fender produced in 1987 was the BXR410 Bass. What you appear to have is a Dual Showman 'Wedge' 412 guitar cab.

The standard corner radius in the US is 3/8 inch. You don't need a gauge to measure it, just a ruler and a straight edge. Place the straight edge on one surface, extending beyond the joint of the two panels, use the ruler placed on the intersecting surface to measure the distance from where the chamfer begins to the straight edge.

Since it's sealed it may be a guitar cab.

[quote name='Jus Lukin' timestamp='1506894734' post='3381909'] Just to be clear, any crossing over (crossovering?!) or signal splitting would be for creative purposes rather than fidelity- say, a clean, deep, compressed signal on one channel, and a gnarly, bass shy drive on the other. [/quote]For that purpose what works best is a bass cab and head paired with a guitar combo.

[quote name='Jus Lukin' timestamp='1506867776' post='3381613'] I'd also like to run split signals, and setting the cab handling the highs nearer head height makes sense to me. [/quote]You only want to do that with cabs specifically designed for that purpose. PA cabs are, bass cabs are not. I'd no more mix cabs than I would a 50 year old single malt with diet coke. Pick the cab that sounds best to you, if one's not enough use two, but keep them the same.

[quote name='Jus Lukin' timestamp='1506862910' post='3381559'] I'm pondering a Big Twin 2 on the bottom... then a Super Midget on top. [/quote]Why?

You use phantom power with mics that need it, typically condenser mics. SM58s aren't condenser mics. Most DIs aren't bothered being hooked up to phantom power anyway, since it's assumed that will be the case in many instances. The DI owners manual will say. BTW, I can't imagine using a DI on a guitar amp, and I don't recommend them for bass either. DIs don't capture the sound of the speaker.

I have a BMW 328, and it works the same with regular, premium or super premium. The M3 is a different engine entirely, so it can benefit from higher octane, by allowing more advanced timing. But those with the standard BMW engines only fool themselves when they think using more expensive gas saves them the price of buying an M.

[quote name='Bigwan' timestamp='1506612661' post='3379957'] The Perrier example is almost word for word the same story as the Magners cider story my brother's been telling me for 15 years. "We'll up the price and convince people to drink cider with ice in". [/quote]It's like 'premium' fuel for your car. In the vast majority of cases it works no better, but since it costs more the masses are convinced that it must work better. In fact, owners of higher priced cars feel shorted if there isn't a sticker inside their fuel filler door that says high octane fuel is at the least recommended, if not required. And then there's the 'Fender Special Design' stickers that have adorned their drivers since the 1960s. Most of the time the only thing special about them was the sticker.

[quote name='fretmeister' timestamp='1506588510' post='3379698'] I also have a hazy memory of something from Economics at school - that Perrier water (I think it was them. Or another expensive water brand) was not originally called that name. It was something else and it was sold at a LOWER price that the other brands. It didn't sell at all - it was viewed as cheap. So it was rebranded and sold at a price 50% HIGHER than everyone else and it sold. It was now viewed as exclusive and luxurious. [/quote]I can't speak to Perrier, but in the US most bottled water is tap water. The bottles it comes in cost more than the contents. It's a true testament to the notion that no one ever went broke [i](or lost an election )[/i] underestimating the intelligence of the American public.