2x12 guitar cab for Line 6 Spider III HD 75 - diyAudio
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Old 26th December 2007, 11:35 AM   #1
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Default 2x12 guitar cab for Line 6 Spider III HD 75

Merry Christmas everybody !

A couple of days ago I bought an used Line 6 Spider III HD75 guitar head. I need a cab for that head and think that a 2x12 configuration is suitable for my home requirements. The Line 6 is a mono 4 ohms head. Has anybody any diagrams, ideas, suggestions, tips or something useful to start ?

Thanks
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Old 26th December 2007, 02:49 PM   #2
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Its really hard to beat Avatar's speaker cabinets. I have one of their 2x12 closed back cabinets with V30s and it sounds awesome.

http://www.avatarspeakers.com/
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Old 26th December 2007, 02:51 PM   #3
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Yes, I heard the best things about Avatar cabs but I live in Argentina and the shipping to my country is more expensive than the cab itself !

Have you diagrams of these cabinets ?
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Old 26th December 2007, 04:32 PM   #4
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Most guitar cabs are open-backed, so the cabinet makes very little difference, just chuck a pair of 8 ohm guitar speakers in parallel (to give 4 ohms) in an open-backed box big enough to hold them.

If you're at all concerned about the size?, then pop in a local music shop with a tape measure, and measure up commercial examples.
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Old 26th December 2007, 05:13 PM   #5
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Thanks Nigel
I was thinking about the possibility of make a closed / semi open cabinet (closed with the possibility of open it) in order to have different tones. I donīt know if itīs very difficult because I never have built any cab.
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Old 26th December 2007, 07:49 PM   #6
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Have a look here:

http://colomar.com/Shavano/stereocab.html
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Old 26th December 2007, 09:09 PM   #7
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Very interesting article Nigel ! But this cab uses a pair of tweeters to reinforce the highs. Do you think that works well without them ? Are important the holes in the front and the wall between the speakers ? Excuse me if these questions are stupid but I know nothing about acoustics...
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Old 26th December 2007, 10:48 PM   #8
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For a guitar amp I wouldn't use the tweeters, they aren't really required.

Like I said previously, get two guitar speakers and chuck them in an open-backed box - that's all you need!.
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Old 27th December 2007, 01:54 PM   #9
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One has to be careful with modelling amps. The Line 6 amps include modelling of the speaker characteristics, and so they already include the rather evil frequency anomalies that the favourite guitar speakers have. They also try to model some of the non-linear effects too. The upshot is that using a good guitar speaker with a modelling amp usually results in a rather poor outcome. Those that have built their own cabs have found that more neutral speakers work much better - basically those drivers that are either known for a much more neutral sound, or speakers intended for PA use. So EV and JBL drivers are good (but seriously expensive) or you could look to the Eminence range, but don't go the guitar speakers, but go to the PA speakers. I have a feeling that Line 6 use a custom Eminence speaker in their cabs, but I'm not totally sure.

That said, you can also turn the cab modelling off in the head. Then you need/want a guitar speaker. The world is then your oyster. Well up to a point. Being a solid state amp it will have a relatively low output impedance, and so the interaction with the bass response will be different to a tube amp. This can can important.

Guitar speakers typically have a quite steep rolloff above 5kHz, so indeed there is little point worrying about a tweeter. The actual dimensions of the speaker cabinets is actually a bit arbitrary. Usually it has been more about getting the most value out of a sheet of plywood, than any real science or design. The main difference in styles is open back versus closed back. As a terrible oversimplification, open is the Fender way, closed the Marshall. But the distinctive sounds of the two, do to some extent come from this. Closed cabs have a noticeably higher Qts, and this leads to punchy bass. Open have lower Qts and the radiation from the back gives the whole thing a more airy feel. There are a great many designs for cabs on the net. Google will probably turn up quite a few.

A good start would actually to have a look at the forums at: http://line6.com/support/index.jspa There are discussions of exactly this topic. Won't help your shipping problems however.
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Old 28th December 2007, 11:08 AM   #10
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Thank you Francis, Iīll try with the Line6 forum.
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