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  1. #1

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    Got a '96 Mini-Brute II; would like to replace the speaker with a lightweight neodymium one.
    Looking at the Jensen N12D, but seems designed primarily for digital modeling amps, though they say it works great for "classic" guitar amps too.
    Anybody have experience with these or have other recommendations?
    Thanks much.

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    The Jazz Guitar Chord Dictionary
     
  3. #2

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    The N12D is a lot of dynamite. Who are "they?" The manufacturer expressly does not recommend it as a replacement speaker to guitar amps. I'd go for the Tornado "Classic", even 4 ohm for more bang and bass response, or the new Blackbird 40 AlNiCo. Just don't crank the amp up all the way with the latter one. Eminence's 125W Lil'Texas is great and I don't understand why it isn't getting more attention. DV Mark's 12" Neo speakers are even lighter and have a high power rating, but the company hasn't issued any specs on them. Some A/B comparisons I've managed to do at music stores indicate that they fall short of the typical 99-101dB efficiency of modern 12" speakers. Smaller magnet, I presume. The Jensens are way louder on the same amp settings.

  4. #3

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    Consider Eminence Legend CA154. It's gotta be a 4-ohm driver or it's not Polytone. When calibrating the poweramp, one uses a 2-ohm load, as stated by the Polytone service manual. Standard 8-ohm speakers not only lower the wattage by half, but also change the overall tonality.

  5. #4

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    There is a lot of conversation about the replacement speakers to Polytones. Usually the result is Eminence Beta 12A (or 10A if it's the needed size). A ceramic speaker, 3,4 kg.

    But I have not seen any discussion about neodymium speakers in Polytones so we are now in a virgin territory!

    The Beta series is not a guitar speaker series so I would follow the bass speaker or pa speaker lines.

    Quilter uses the Celestion BN12-300S which is a bass speaker. Eminence has the Deltalite series.

    Eminence has a Custom Shop that will do You a 4 ohm version of their speakers if You want to. A bit pricey unless You live in US.

    Don't be afraid using 8 ohm speakers. When You change the speaker the tonality of the amp changes anyway. And there is still a lot of volume available in these amps.

    Keep us informed, here is a lot of devoted Polytone users who would not mind making their combos a bit lighter!

  6. #5

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    Faital Pro 8FE200 8" Speaker Driver 130 W 4 Ohm

  7. #6
    Herbie,
    "Keep us informed, here is a lot of devoted Polytone users who would not mind making their combos a bit lighter!"

    No kidding, I had '70s and '80s MBs, but the '90s versions weren't so "mini" anymore, at least weight-wise.

  8. #7

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    Quote Originally Posted by ffej
    Herbie,
    "Keep us informed, here is a lot of devoted Polytone users who would not mind making their combos a bit lighter!"

    No kidding, I had '70s and '80s MBs, but the '90s versions weren't so "mini" anymore, at least weight-wise.
    I have polytone skin diamond II
    It doesn’t weight at all, about 25 pounds.
    I did experiments with other speakers, this one has the original stock CTS, heavy duty with paper cone. Out of production from years. I got another MB4 with cts lightweight stock speaker, and a baby b.
    Faital pro is just fine. 4ohms impedance, wattage more then 100w.
    The polytone sound is in the preamp, wood cabin and speaker.
    Try with a 4ohm neo, but I guess the sound couldn’t be the same.
    I measured the wattage on my own polytones, they deliver less power, the 100 watts they declaring are not real.You can also use a 75 watt speaker.
    Consider an 8ohm but you will get half power. Amp works colder with an 8 ohms. Polytones are best solid state for jazz

  9. #8
    After all the comments here and more research, it seems the only available neo option for a Mini-brute II (12", 4 ohms, 100W) is the Jensen Tornado Classic, but there are a lot of complaints that they're "sterile".
    Considering scrapping the idea and sticking with the stock speaker and extra tonnage.
    Anybody specifically have experience with the Tornado in a Polytone or similar small, closed cabinet, playing at medium volume levels?
    Thank you.

  10. #9

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    Before you scrap the idea, I replaced the 15” on my Polytone with a Delta Pro. It’s not a “guitar” speaker but a full range sound reinforcement speaker, and is light Neo. Sounds very good, in fact I put one in my PR too. Good luck!

  11. #10
    Quote Originally Posted by Gitterbug
    The N12D is a lot of dynamite. Who are "they?" The manufacturer expressly does not recommend it as a replacement speaker to guitar amps..
    The Jensen site says, "the N12D is able to return the feel, the warmth and the character of a classic guitar amplifier, but also...."

    I may be mistaken, but I took that to mean they are compatible with regular, non-modeling amps. Saw where they were not recommended but that was at another site (not Jensen, I believe) and now I can't find it.

    Thx for your input.

  12. #11
    Quote Originally Posted by jazzkritter
    Before you scrap the idea, I replaced the 15” on my Polytone with a Delta Pro. It’s not a “guitar” speaker but a full range sound reinforcement speaker, and is light Neo. Sounds very good, in fact I put one in my PR too. Good luck!
    Thanks, but I'm only seeing it available in 8 ohms in the 12", and for the MB II I really prefer to stick with 4 ohms.

  13. #12

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    My experience with Jensen Neos are they are quite brilliant . If you’re interested i have some leftovers i took out and never looked back.

  14. #13

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    +1 for Jensen Tornado. I have them in tube and ss amps and I haven’t suffered from sterility.

    And again about the ohmage: if You play medium volume, there is not a lot ’hotness’ in the ss amp anyway. Might be worth trying at least.

  15. #14

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    Quote Originally Posted by ffej
    The Jensen site says, "the N12D is able to return the feel, the warmth and the character of a classic guitar amplifier, but also...."

    I may be mistaken, but I took that to mean they are compatible with regular, non-modeling amps. Saw where they were not recommended but that was at another site (not Jensen, I believe) and now I can't find it.

    Thx for your input.
    I have this info somewhere in writing by Jensen's expert Ignazio Vagnone. The 12D could be fantastic for pedal steel but that's another world.

  16. #15
    I've purchased the Jensen Tornado Classic (4 ohm), looking forward to having it installed in a couple weeks, will report back.
    Also, having the (IMO) annoying wraparound power cord replaced with an IEC plug for a detachable cord, along with having the electronics brought up to spec as necessary, as it's 25 years old and has some issues. Should be pretty much like a new amp.
    Thanks for all your comments.