stevie

[quote name='Phil Starr' post='1307456' date='Jul 18 2011, 09:20 AM']I love these old cab designs, I don't think the designers knew themselves how they worked half the time. Reading the article in the link about adding weighs to the tone arm to extract more subsonics and needing to protect the room from the speaker reminds me of some of the loony articles more recently written about cables in hi-fi systems.[/quote] The fact that the design was published in Hi-Fi Answers speaks volumes.

Yes, there is a point where it ceases to be a port and it just becomes a gap. The cabinet then changes from a reflex to a dipole. If you blow across the neck of a bottle you'll get a sound, but if you try it with a jam jar you get nothing.

[quote name='Bill Fitzmaurice' post='1306659' date='Jul 17 2011, 01:45 PM']Exactly. All the parts are the same as a standard bass reflex, they're just rearranged. It would be easier to visualize as a bass reflex with the driver mounted in the usual fashion, but that's what one's imagination is for. Now if one has no imagination... [/quote] It doesn't look like a reflex cab no matter where you stick the driver. There is no Vb. The resonator chamber isn't loading the driver as it would in a normal reflex cab, because it's separated from the driver by a hole. Take away the resonator chamber and what you've got an arrangement that is closer to a transmission line than anything else. Not only that, but according to the patent, the design is flat to 7Hz using a 15" driver without any special characteristics. I'd like to see that in WinISD.

[quote name='alexclaber' post='1306489' date='Jul 17 2011, 11:02 AM']Stevei, tsn't a reflex cab a Helmholtz resonator? Though I see your point, you're suggesting that the cab works by solely exciting the resonant system of the two masses of air in the ports vibrating against the spring that is the volume of air in the enclosure divided by the area of the port:enclosure opening. But what's happening with the woofer backwave, why wouldn't that act like the frontwave from a woofer in a normal ported design?[/quote] A reflex cab contains a Helmholtz resonator, which is the vent, but a reflex system is more than just the vent. This design seems to rely solely on the vent to produce sound - just like blowing over a bottle. The contribution from the rear of the driver would be what you would expect from a driver in free air (or from the air blowing over a bottle)- practically nothing. I think the only reason the driver is not boxed in is because it would raise its resonant frequency. However, if you imagine this system with the driver boxed in, it starts to look very much like a bandpass system.

[quote name='Bill Fitzmaurice' post='1305759' date='Jul 16 2011, 01:42 PM']It's a bass reflex cab, nothing special or unusual except for the external driver mounting, and that serves no purpose, it could be inside with the same result.[/quote] It's not a reflex cab. It's a Helmholz resonator - it more or less says so on the drawing. It has more in common with a classical guitar than a ported cabinet.

I wouldn't call that B stock. It's plain faulty and you'd be justified in asking for your money back. You might be lucky, but you'll certainly never be able to rely on it.

[quote name='Musicman20' post='1289722' date='Jul 1 2011, 11:26 PM']I think I'll bow out and wait for the Bass Gear Magazine writeup. If you want to void the warranty, go down to 2.6 (?) or 2 ohms with non TC cabs. There is a vast library of info on talkbass about it.[/quote] Please don't think I'm having a go at you, Musicman, but all of the discussion on Talkbass (which I haven't read) would have been totally unnecessary if the manufacturer had provided proper specs. That's my beef. And we shouldn't have to wait for a magazine review to confirm a key product specification. I wonder if anyone has actually asked TC straight out what the score is.

I almost forgot - could you use a midi file of this? You'd have to message me your email address, as midi files won't post on here.

I stand corrected

[quote name='alexclaber' post='1289462' date='Jul 1 2011, 07:34 PM']If anyone's interested I can probably get a whole bunch of plots next week and we can see if there's anything special about the RS cabs.[/quote] That would be very interesting, yes.

[quote name='Musicman20' post='1289459' date='Jul 1 2011, 07:25 PM']Err, it is apparently. They don't know the exact ohmage of other peoples cabinets. Tom from Bass Gear magazine stated they have tested them, and the TC cabs are rated slightly higher in actual specs, so they know it will be safe.[/quote] They know as much about the impedance of other people's cabinets as any other amplifier manufacturer. It's not a problem for anybody else - they just state a minimum impedance and that's it. It says 8 ohms on the back of the TC cabinets. It says minimum 4 ohms on the back of the amps. They can't both be true. Which one is wrong? Their cabinets look quite good value to me. They shouldn't need to resort to these shenanigans to flog them. Just give us the facts and we'll make our own minds up.

I think the original was a Motown song, wasn't it? Your singer probably wants to be Michael Buble, who does an amazing version. :-)

[quote name='Musicman20' post='1251765' date='May 31 2011, 04:53 PM']Its because TC know the exact impedance of their cabinets, whereas they dont for other manufacturers.[/quote] Errr, no it's not. TC are withholding information from you to prevent you from making an informed decision. That way, you are more likely to buy their cabs to go with their amp. The same technique is used by the the utility companies to prevent you from switching suppliers. It's not very ethical, but there you go.

[quote name='Bill Fitzmaurice' post='1286571' date='Jun 29 2011, 04:08 PM']And Eminence didn't get to be the #1 driver manufacturer in the world by producing crap.[/quote] Just because you're the world's no. 1 manufacturer doesn't mean you don't produce crap. There isn't a natural relationship between size and quality. Look at General Motors.

[quote name='chris_b' post='1280435' date='Jun 24 2011, 01:57 AM']In real world situations this is probably closer to the truth. When I played a 210 and 115 Basschat told me that using different speaker sizes gave me problems, but it didn't! Now I'm being told I have a problem because I stack my cabs the wrong way. I don't! People should put more trust in what their own ears tell them.[/quote] +1 to that!

[quote name='Pete Academy' post='1280728' date='Jun 24 2011, 11:26 AM']Someone bought an original '61 Strat in to our shop. As soon as it was plugged in you could hear how much better it sounded. As a bass player I hate the back pickup on Strats, but this was fat and smooth - no harshness whatever. The whole sound and tone was just amazing.[/quote] After all those years, what are the chances that the pickups were original? A Duncan APS-1 will improve the sound of the back pickup on any pre CBS strat - not that many people are likely to swap.

[quote name='Mr. Foxen' post='1280965' date='Jun 24 2011, 01:35 PM']That is much less expensive than I was anticipating.[/quote] The reviews are a bit mixed though.

[quote name='Al Heeley' post='1280547' date='Jun 24 2011, 09:24 AM']Just bought a 250W Hartke VX 2x10 + horn from a basschat member which would be handy to position just behind the head of our drummer to help him keep time.[/quote] Isn't that the guy who's supposed to help everyone else keep time?

[quote name='Mikefwlr' post='1280931' date='Jun 24 2011, 01:13 PM']EA seem quite secretive about the specs for their cusdtom drivers. Guess i could measure the impedance with a multimeter (but i don't have one), anyone know the specs of these woofers?[/quote] That's because they like charging £150 a driver for replacements. Measuring the impedance won't get you very far, I'm afraid. If you want to send me one before they both die completely, I'll measure the T/S parameters for you.

If you have any old sleeping bags or duvets you don't need, take the filling out and use that. It's the same stuff.

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