speaker combinations for a 3-15 [message #26222] |
Fri, 21 July 2017 14:02 ![Go to next message Go to next message](/FUDforum/theme/vk30/images/down.png) |
terminal
Messages: 20 Registered: June 2009 Location: GEORGIA
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Junior Member |
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I have a 1971 3-15 with CTS speakers (all three speakers are 1377116). My amps are K100-1's. I was thinking about adding a jack plate to the back of the cab with 1/4" TRS switch jacks, maybe one for the top speaker and one for the middle speaker. The 3rd jack (the original) would connect the bottom speaker to the switch jacks (and thus the speakers) in parallel. If I only plug into the bottom jack, I have 5ohms (as original, all three 15"s). If into one of the other two, say the top, then I have 16ohm (like an original K100-15-1).. If I plug into the bottom jack and then plug an unconnected plug into one of the other two (rendering that speaker unconnected), I'd have 8ohm at the bottom jack.
I'd post a schematic of what I'm thinking if I had the post count for links..
anyone try anything like this?
I'd like to try different speaker combos but I don't want to take the back off the cab (45 screws?) ever again!
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Re: speaker combinations for a 3-15 [message #26223 is a reply to message #26222] |
Fri, 21 July 2017 20:01 ![Go to previous message Go to previous message](/FUDforum/theme/vk30/images/up.png) ![Go to next message Go to next message](/FUDforum/theme/vk30/images/down.png) |
Iowa Boy
Messages: 767 Registered: June 2014
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Senior Member |
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I did something similar to what your thinking with 2 of my 3-15's only I added a switch into the circuit so I could use all three speakers or just the two bottom ones. 5.33 ohms to 8 ohms. I then used a 16 ohm horn with crossover and connected to the top speaker jack and ran that to my bi-amp. This way I get full use out of four speaker cabinets and don't run the risk of frying my amps. Just have to make sure you have the correct speakers selected for either application or you will cook your amp head.
[Updated on: Fri, 21 July 2017 20:02] Report message to a moderator
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Re: speaker combinations for a 3-15 [message #26230 is a reply to message #26222] |
Mon, 24 July 2017 12:41 ![Go to previous message Go to previous message](/FUDforum/theme/vk30/images/up.png) ![Go to next message Go to next message](/FUDforum/theme/vk30/images/down.png) |
stevem
Messages: 4763 Registered: June 2004 Location: NY
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Senior Member |
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No, that's not the consensus!
100 and 150 series amps need a 8 ohm load to output max power, 200s and 250s need a 4 ohm load, period!
Also note that the port area of the two tubes used in the cabinets is not large enough for even just the 2-15" inch cabinets , no less a 3-15" cab , so not using one of the 15's to save its needed cab sq footage and then setting up the cab for 8 ohms will help the amp have more puncheon the low end!
[Updated on: Mon, 24 July 2017 12:47] Report message to a moderator
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Re: speaker combinations for a 3-15 [message #26248 is a reply to message #26222] |
Mon, 31 July 2017 05:54 ![Go to previous message Go to previous message](/FUDforum/theme/vk30/images/up.png) |
stevem
Messages: 4763 Registered: June 2004 Location: NY
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Senior Member |
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I have found that you can get a lot of dust and grime off of the grille cloth by just wetting it from a sponge that also has some dish wash detergent in it , then do a scrub job with a tooth brush , then absorbe the floated grime with paper towels, or wet shop vacuume it.
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