Impedence of JBL D140F [message #27491] |
Mon, 09 September 2019 11:08 ![Go to next message Go to next message](/FUDforum/theme/vk30/images/down.png) |
oldnavycdr
Messages: 38 Registered: July 2006 Location: Sanford, NC
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I have a late 60's K100 with the single 15" speaker -- a JBL D140F. As I understand, these speakers were 8 ohms but I want to make sure before I try using a different amp head than the K100. I'm picking up a Vox AC15 Custom head which has outputs for either 8 ohm and 16 ohm speaker cabinets. One thing I want to make sure of is to avoid any damage to this vintage (and original) JBL speaker. It sounds wonderful with the K100 head but I want a variable wattage amp.
Old Navy
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Re: Impedence of JBL D140F [message #27493 is a reply to message #27492] |
Mon, 09 September 2019 18:08 ![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) |
oldnavycdr
Messages: 38 Registered: July 2006 Location: Sanford, NC
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The speaker has held up well, rarely played at full volume and remains smooth with no break up. Cone is intact and no voice coil rattle. I have found specs for it but I'm wondering if Kustom ordered 16 ohm speakers rather than the stock 8 ohm. I do have a multimeter and can test but my question has more to do with the load on the amp. I want to match amp output impedance with the correct speaker impedance thus protecting both amp and speaker.
Old Navy
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Re: Impedence of JBL D140F [message #27500 is a reply to message #27491] |
Wed, 11 September 2019 12:20 ![Go to previous message Go to previous message](/FUDforum/theme/vk30/images/up.png) |
stevem
Messages: 4772 Registered: June 2004 Location: NY
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Your posted comment on having a "variable wattage amp "is what made me post the info on what happens when you mismatch a speaker load on a tube amp , as that is the only way to change a tube amps output wattage without digging into its electronic's.
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