bcinbergen Posted May 15, 2019 Share Posted May 15, 2019 I replaced the 30 watt 4 ohm Line 6 celestion with a 25 watt 8 ohm greenback.to boost the output Im running a pedal pre input jack. I use the FBV to change channels and use the blues and clean mostly. Any thoughts or comments will be helpful. Quote Link to comment Share on other sites More sharing options...
psarkissian Posted May 15, 2019 Share Posted May 15, 2019 Don't do that. Put it back to the way it was. Quote Link to comment Share on other sites More sharing options...
bcinbergen Posted May 5, 2020 Author Share Posted May 5, 2020 Reasons please? 1 Quote Link to comment Share on other sites More sharing options...
fflbrgst Posted May 5, 2020 Share Posted May 5, 2020 V=iR - V= voltage, i= current, R= resistance. Assuming the amp's output is a steady current, you are doubling the voltage seen in the amp's output section. Also, by boosting the input, you could overdrive the input section of the preamp.. Either one will not be good. But you posted this a year ago, how's it been working for you? 1 Quote Link to comment Share on other sites More sharing options...
bcinbergen Posted May 5, 2020 Author Share Posted May 5, 2020 (edited) I only used it out once since the swap it sounds fine in tbe house but i forgot i did it. When i saw it yesterday i searched and found my own thread and a vague answer! Thanks for the response. Ill swap it back before i use it out. B Edited May 5, 2020 by bcinbergen Clarity Quote Link to comment Share on other sites More sharing options...
psarkissian Posted May 6, 2020 Share Posted May 6, 2020 -- Hope it isn't new, you just voided the warranty by not using a speaker of the same impedance. -- What fflbrgst said. Impedance matching,... the output load must be matched with the output impedance. Never use anything other the speaker with the same Ohms impedance, as it is matched up for that. -- Greenbacks are shielded. Greenbacks are used where multiple speakers are used in one cabinet, and so are shielded to prevent mutual inductance with non-shielded speakers in the same cabinet. -- Using Greenbacks just because they're cool speakers is a waste of money, unless you have something next to the cabinet that is sensitive to magnetic fields. -- Be careful with the pre-input boost, don't want you crash the input circuit. Quote Link to comment Share on other sites More sharing options...
bcinbergen Posted May 6, 2020 Author Share Posted May 6, 2020 thanks for the reply. no warrantee worries here. i dont use this amp much. it sounds fine. What do you think about putting the greenback into a deluxe reverb i play blues with?when ever that is! Quote Link to comment Share on other sites More sharing options...
psarkissian Posted May 6, 2020 Share Posted May 6, 2020 Useful if the cabinet has more than one speaker. Quote Link to comment Share on other sites More sharing options...
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