Guitarhacker
the main thing is to use good quality wood/plywood, and brace it and glue it so it can survive the bumps and drops and won't start rattling and buzzing over time.Nothing sux like a buzzing cab on those resonate low notes.  

I have never been accused of under building anything. Normally people point and laugh because you can park a truck on my tables...
I suspect this build would fall into the category of 'sturdy'.

(I'm not carrying that damn thing....you carry it...)

spacealf

http://lenardaudio.com/education/05_speakers.html

Musical Education 101 I guess!  

Thx for the link

I added another link to my last post (which I guess I was slow in adding with Editing the Post).
 
Here it is again:
http://www.duncanamps.com/technical/speaker_cab.html
 
I thought low frequency of the low E string on guitar was 160Hz not 80Hz which I thought was Bass Guitar. I guess I will have to look that up as usually to me Bass Drums were around 60Hz. If that is the case then there is a misprint in that link.
 
Well, other links can be searched for I suppose.
 

The fundamental of a bass guitar's low E = 41.2 Hz.

 My old Electrical Handbook as 88 note piano showing as low frequency in the chart at 30Hz. The graphic shows different instruments and frequency range of such instruments - no guitar though, just Tubas, and Wind Instruments and such.
 
Might be a different way with speaker leads though. One day someone goes in and marks all the negative terminal as the positive one and then when try and hook up the speaker, the leads are reversed. Thus the battery check to ensure that the speaker cone is moving out and not in with that battery test.

 
 Well, good luck. Tweak those frequencies.
 

Speaker phasing is only an issue with multiple drivers. Most Fender reverb amps have an output that's opposite to the input. When you hit a note the cone actually goes backwards. The non reverb channel pushes outward on the attack. WHy? Because the reverb channel has one extra gain stage. Every time the signal goes through a gain stage it gets inverted.
 
If you want to see for yourself, slave the normal and reverb inputs together with a patch cord. Very bad tone. Most people can't hear a single driver that's out of phase. Vintage Jensen's often have the terminals incorrectly identified and you have to check them if using multiple drivers. The battery test is great for that, but I use a 1.5 volt, not a 9 volt. Speaker voice coils are designed for ac voltage and putting dc on the voice coil can burn them out or warp them causing a rub. You want to just give them a very short pulse of dc.

DOH!!!

OOPS

Only want to click the speaker with the D cell battery (1.5v) or perhaps C cell and not hold it on the speaker terminal.
I would op for the speaker cone to move out first, and not have the sound of the cabinet be the first thing coming out as the sound though, the speaker sound directly first of all.
 
 
 

ampfixer
Speaker phasing is only an issue with multiple drivers. Most Fender reverb amps have an output that's opposite to the input. When you hit a note the cone actually goes backwards. The non reverb channel pushes outward on the attack. WHy? Because the reverb channel has one extra gain stage. Every time the signal goes through a gain stage it gets inverted.

 
 
http://www.jblpro.com/BackOffice/ProductAttachments/JBL_TechNoteN1V12C_v5.pdf