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Thread: speaker question

  1. #1

    speaker question

    Just as a fun experiment, I'm thinking of trying out some different speakers in my old Guild Model Three solid state 1x15 bass combo (late-70s to early-80s I believe). I know these aren't the greatest amps, but I imagine the sound will improve with the right speaker and that I could end up with a nice little practice rig. The old one in there right now sounds very stiff and mid-heavy to my ear (for lack of better terminology).
    So now I'm wondering if anyone has any insight into how many ohms the original may have been? I haven't been able to find specs or much info at all about it on the greater web. I'm assuming it was probably 4 or 8, but if I hit a wall in this investigation, it should be safe to try 8ohm speakers, right? My understanding is that with solid state amps speaker impedance is less important as long as you don't go below the minimum, no?
    Any input/thoughts are appreciated!

  2. #2
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    Anyone know if the transistor bass amp is any different from the Model One or Model Two other than speaker type and size?

    I know the Guild Maverick tube amp for guitar and bass used a pair of 7591 tubes, which are not known for use in bass amps, had differences more than just different speakers to enhance bass performance. The obvious Reverb and Tremelo circuits were removed but my memory says other changes to the preamp were also made.

    M

  3. #3
    Super Moderator Default's Avatar
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    Quote Originally Posted by mellowgerman View Post
    Just as a fun experiment, I'm thinking of trying out some different speakers in my old Guild Model Three solid state 1x15 bass combo (late-70s to early-80s I believe). I know these aren't the greatest amps, but I imagine the sound will improve with the right speaker and that I could end up with a nice little practice rig. The old one in there right now sounds very stiff and mid-heavy to my ear (for lack of better terminology).
    So now I'm wondering if anyone has any insight into how many ohms the original may have been? I haven't been able to find specs or much info at all about it on the greater web. I'm assuming it was probably 4 or 8, but if I hit a wall in this investigation, it should be safe to try 8ohm speakers, right? My understanding is that with solid state amps speaker impedance is less important as long as you don't go below the minimum, no?
    Any input/thoughts are appreciated!
    Take the speaker out and get an ohm meter. Measure with the probes, one on each terminal. It will read slightly less than the impedance. 6 ohms, means a 8 ohm speaker. 3.4 means a 4 ohm speaker.
    "Steve, you are a man of many goats."~ capnjuan

    "Alternatively, you could just go the ultra-relic route with it. Basically go for a look that says the amp was on fire and they put it out using belt sanders."
    (amps - I need a "99" & "50")

  4. #4
    Quote Originally Posted by Default View Post
    Take the speaker out and get an ohm meter. Measure with the probes, one on each terminal. It will read slightly less than the impedance. 6 ohms, means a 8 ohm speaker. 3.4 means a 4 ohm speaker.
    Yeah I was trying to get around buying another ohm meter... but as I write that statement I see how silly it sounds. I lost mine a few years back during a move and it's a good thing to have around so I should just scoop up another. Still though, even if I do the ohm meter test, I'm still not convinced the speaker is original. I was hoping maybe someone would have some wisdom to offer along the lines of "all guild combo 15's were 8 ohm" or something like that. I remember my Thunderstar bass head was for use with an 8ohm cab only

  5. #5
    By the way, thanks for chiming in gents

  6. #6
    Well, I scored a gorgeous vintage 8ohm JBL locally today and the amp was immediately transformed into a whole different animal. Sounds 10x better than I ever imagined this little shallow-box, solid-state black sheep could!

  7. #7
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    I'm curious...did you install a D120 or K120?

    M

  8. #8
    I'm not sure to be honest. It was starting to get late when I got home and I wanted to try it out still so I didn't waste any time putting it in out of courtesy to the neighbors. It came out of an old JBL 1x15 PA cab with a blown horn. Has a 3 inch voice coil and a nice beefy magnet, but there was no printed label on it listing a model number. Some fading/faded code stamps, but again, I was eager to see how it sounded in the amp, so I installed it without trying to decipher and research.
    I'm bringing the amp to a jam tonight right after work. First block of free time I get I'll try to get you a model number on it though

  9. #9
    Any JBL will greatly improve any amps sound, IMO.

  10. #10
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    If it is a JBL with a 3" diameter then it isn't a D or K 120 or D131 model as they have 4"diameter voice coils.

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