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dB-Mark XCA 28 - DSP Basics for a Newbie |
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Conanski 
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Joined: 26 January 2006 Location: Canada Status: Offline Points: 2401 |
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 Topic: dB-Mark XCA 28 - DSP Basics for a NewbiePosted: 18 March 2023 at 7:42pm |
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With my DIY builds I generally use the same gauge speaker wire inside a cab as gets used outside, so that means sub cabs will get heavier wire than mid/high boxes. But that produces a mechanical problem in some cases, the weight of the wire can put strain on the driver terminals so it may need to be clipped to the internal structure of the enclosure to prevent damage occurring over time when the cabs are moved around.
It's not uncommon to find some really small wire inside mass produced speakers, that might seem like an oversight but the wire in the driver voicecoils and on components in a passive crossover is also really small so it's not as bad as it seems. But if you find rigid and/or bare wire inside a cab I doubt that is original, it should always be flexible and insulated.
Edited by Conanski - 18 March 2023 at 7:46pm |
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SnailSpace
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Posted: 18 March 2023 at 6:52pm |
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Thanks, I’ve probably got some knocking around if not I’ll order some cheers
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DMorison
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Posted: 18 March 2023 at 2:54pm |
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Speaker wire is almost always copper, some of it is just plated to reduce the chance of corrosion.
Use any standard speaker wire of reasonable size, the cost difference between minimal and decent is still less than the cost of delivery so won't really matter - either of these should be fine for example: http://www.bluearan.co.uk/index.php?id=JAMBC2338, http://www.bluearan.co.uk/index.php?id=JAMBC215DL1M. |
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SnailSpace
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Posted: 18 March 2023 at 9:16am |
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I understand about wire gauges outside of the Cabs but I’ve always wondered why it didn’t apply on the inside.
Does the internal wire have a name as I also need to order some or should I use the old very thin gauge speaker wire I have? I think I have some from an old bookshelf speaker but it might be copper? I don’t think I’ve ever seen copper internally it is always silver?
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SnailSpace
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Posted: 18 March 2023 at 9:10am |
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Ok probably better off cashing in I suppose and putting it towards the next stage.
Edited by SnailSpace - 18 March 2023 at 9:13am |
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Conanski
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Posted: 18 March 2023 at 5:32am |
The internal wiring in a speaker cab( if original) is usually sufficient to cover the short distance between the cabinet terminal and the drivers at the power levels they are rated for. For longer runs from the amplifier to the speakers larger gauge wire should be used but in your case you probably don't need anything more that 14ga. All those drivers you listed are very low power by modern standards and wouldn't be hard to blow under PA uses, I have some Celestion G15-150 drivers that look really beefy but they died pretty quickly in PA cabs... they're just not built for that kind of use.
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Lucasdude
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Joined: 16 March 2013 Location: London Status: Offline Points: 603 |
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Posted: 17 March 2023 at 11:17pm |
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Celestion G12 are guitar speakers. Did they come out of a 2x12 combo?
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SnailSpace
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Posted: 17 March 2023 at 11:12pm |
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I have the x2 12” dual cabs (not great but suppose I can use them to see which sounds best as the back opens)
Q) Why do Internal Wires always seem to be very thin silver wore when I open cabs up? What type of wires is favoured for internal wiring?
Edited by SnailSpace - 17 March 2023 at 11:17pm |
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Conanski
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Posted: 17 March 2023 at 10:31pm |
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If you have 4 of the Jamo 12's you are all set, build some 212 boxes with the PV CD's and maybe a different horn that will fit the form factor better to give you something like this..
 Edited by Conanski - 17 March 2023 at 10:32pm |
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SnailSpace
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Posted: 17 March 2023 at 8:10am |
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Thanks that was going to be my next question whether that rating would be based on all speaker or largest. (I saw a discussion on here where they were slated as the worst speaker ever. I’ve seen photos of the mud and horn and yeah they are basic but balance with the 12” they sound ok as a home speaker. Also I think people based opinion on the magnet size but surely it should be based on sound!) Anyway I’ve been thinking about what Upper Mids would best work with & compliment my Lower Mids Black Widows, as you say I could use the x4 12” out of the Jamo or I have other 12s I’m wondering if they are more suitable: I have: x2 12” Celstion G12/75 -Sensitivity (dB) 97 -Frequency range (Hz) 80-5000 -Chassis type - Pressed Steel Resonance -Magnet Type - Ceramic -Resonance frequency, Fs (Hz) 85 -Voice coil diameter (‘’) 2 x4 12” McKenzie (Fane) 70w (8ohm) but lacking info on these. I have x2 boxes that fit x2 12”. I also have x2 flare boxes that fit x1 12” in each. Also: x2 15” HH 150w (gonna see if there’s any info on back of these) x2 15” McKenzie (Fane) 100w (again need to find info on these) I could try and source x2 of these to make them a balanced x4? I was wondering if any of these would be any good for Upper Mid? (Or I could sell Jamos, Celestions are also worth a few quid and use money to fund my 18” and something that fits better with Black Widows range) Edited by SnailSpace - 17 March 2023 at 8:47am |
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Conanski
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Posted: 17 March 2023 at 3:22am |
That is better than I had suspected... closer to a PA speaker than a home/studio version. The low frequency driver in a speaker like this generally determines the sensitivity for the whole system, so if you wanted to simplify and streamline your system in the future you could build new boxes for the 12's and get rid of the other drivers. The PV drivers/horns will replace the Jamo mid and high drivers.
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SnailSpace
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Posted: 16 March 2023 at 11:24pm |
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I found the range of the Jamo’s
48-20.000hz
(I’m curious to know if the 12” say anything on them, I’ll have a look inside one)
Edited by SnailSpace - 16 March 2023 at 11:35pm |
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SnailSpace wrote: