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Bill Fitzmaurice

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Everything posted by Bill Fitzmaurice

  1. Bill Fitzmaurice
    That probably won't have any effect either. What limits a speaker's output is the cone excursion limit, xmax. Most drivers will reach xmax with less than half their rated power, so unless your speaker is rated for at least twice what your amp is chances are a lower impedance version would go no louder. The same as with a resistor.
  2. Bill Fitzmaurice
    It would be going into 4 ohms. Half the power would drive the speaker, half would drive the resistor, and when you factor in that an amp doesn't develop twice its maximum power into a halved impedance load the result is that it won't be as loud. There is an impedance reducing device that will give you more output: a second speaker.
  3. Bill Fitzmaurice
    No engineer worth paying attention to ever said that. What they would have said is that while mixing cabs always works, identical cabs usually work better. They'd also point out that note that any cab that doesn't give you the tone you want by itself isn't worth having at all.
  4. Bill Fitzmaurice
    They know perfectly well the perils of not offering their customers what they want, whether it's good engineering or not: lost sales.
  5. Bill Fitzmaurice
    Isn't there a sticky that covers all of this?
  6. Bill Fitzmaurice
    If it has the same pre-amp gain structure that would make no difference other than at full output, and then the difference would be slight.
  7. Bill Fitzmaurice
    That.
  8. Bill Fitzmaurice
    Compression can't hurt an amp.
  9. Bill Fitzmaurice
    Maybe, maybe not. There are many more variables in play than just cone area. Unless you have definitive data, which no manufacturer I'm aware of provides, the only way to find out is by trying other options side by side with your present cab.
  10. Bill Fitzmaurice
    Gain structure. It can be set so the amp is screaming at 3, but doesn't get any louder than that at 9.
  11. Bill Fitzmaurice
    Google 'gain structure'. It must have higher gain than the Ashdown did. Throttle it back by using the amp pad switch or your bass volume control.
  12. Bill Fitzmaurice
    When it was used with a ten and two sixes?
  13. Bill Fitzmaurice
    The 15L and 15B were literally the guitar (lead) and bass versions. The primary difference was Qes, 0.25 for the L, 0.30 for the B. Lower Qes gives stronger highs, at the cost of lows. Loaded in a TL606 cab the knee frequency of the L was 100Hz, the B was 80Hz. The high end knee of the L was 5kHz, the B 3.5kHz. Why Mesa would have used the L for bass, especially in a three-way cab, is puzzling.
  14. Bill Fitzmaurice
    That's what you pay to Clapton, McCartney, Entwhistle and the like. Drivers have impedance. Peavey lists the 1502-4 Black Widow in the TNT 160. Specs are Fs 43Hz, Qes 0.38, Qms 7.9, Vas 192L, Re 3.2 ohms, Xmax 2.8mm. Many drivers come close enough to that to work, though I'd look for one with at least 4mm Xmax.
  15. Bill Fitzmaurice
    Alternate opinion, they remind me of what we used to say about the F4 Phantom : Put in a big enough engine and you can make anything fly. If the OP wanted to go to the trouble he could have the EVM-15B that's been hanging from a nail in my workshop for the last 12 years. That's how long it's been since it was worth my lugging it around.
  16. Bill Fitzmaurice
    You can get a recone, but it won't be cheap, and you'll still end up with a forty year old driver that, by today's standards, isn't all that good for electric bass.
  17. Bill Fitzmaurice
    I'd sell it as is. A replacement driver close to the capabilities of the original will cost you close to what the cab is worth.
  18. Bill Fitzmaurice
    I don't see any 410s on their site, nor any indication of what they use for drivers.
  19. Bill Fitzmaurice
    That's not a good thing. The Beta 10 is barely adequate for electric bass. With only 3mm xmax it's displacement limited to only about 50 watts. Many 2x12s will produce as much low end as a Beta 10 loaded 4x10.
  20. Bill Fitzmaurice
    You very well could have burned out the power transformer and a lot more. If you're very lucky you might have only blown a fuse.
  21. Bill Fitzmaurice
    Sealed or not a 15 doesn't have the dispersion of a 12. It may have less low frequency output than a ported 12, but the ported 12 is still more likely to distort at a lower power input. That said I'd rather matched 12s. You probably find that the 12 and 15 sound better together than either does alone, but that's the case with almost any cab pairing.
  22. Bill Fitzmaurice
    You want the cab with the wider midrange dispersion and lower excursion limited power on the top. In this case it's the 112. The the case of a 410/115 it's the 115.
  23. Bill Fitzmaurice
    What it means specifically could be just about anything. For decades Fender drivers were labeled 'Fender Special Design' and the only special about them was the label.
  24. Bill Fitzmaurice
    In the case of Eminence you tell them what you want for the basic frame/motor and a ballpark performance goal, so the conversation would start something like 'What do you have that's similar to the 2512'. Eminence will provide you with a few data sheets for the 2512 frame/motor with various cone, spider and voice coil options for you to choose from. If you see one you like they'll send you a sample for you to test. In most cases it won't be much different than the stock driver, nor any better. When Eminence introduces a new driver line they test dozens of versions, and the one they think is the best of the bunch is the one that ends up in the retail catalog. One notable exception is the 3012 family. I worked with quite a few OEM 3012s that had specs in between the 3012HO and the 3012LF. IMO they were better than either the 3012HO or LF for electric bass applications, and they did make their way into some cabs that I designed for manufacturers, including one voted 'Best New Speaker' by some sources.
  25. Bill Fitzmaurice
    Or other manufacturers over-rate theirs. In any event where the maximum output of a speaker is concerned the primary spec is xmax, not watts, so until manufacturers start revealing their xmax figures you simply cannot make a valid comparison between cabs.
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