relevant frequncies for guitar, then for bass ?

[petemoore]

  For bottom ported tower type speaker project.
  Would like bass extension like HiFi towers, wondering what frequencies to preponder for a design to have a cabinet amplify 'lows' for guitar ?

[jkokura]

Take a look at commercial 'crossover' units. If I understand them correctly, you send you signal into a crossover out of your mixer, the cross over then splits the signal into 2, 3 or 4 'bands' by eliminating the frequencies outside of each band's range (e.g., bass, low mid, high mid, high) and then gives you an output for a power amp to supply a speaker or speakers that will only then amplify the needed range. So in a large stage instance, you send your signal to a crossover that splits to bass, mids and highs - the bass gets sent to the poweramp for your subs, the mids to power amps for the 'mains' and the highs to a poweramp for some 'tweeters.'

It sounds like you want a two band crossover type situation, and want the frequencies that correspond with the bass and the mids/highs. I'm not sure what they are, but if you look at the tech specs of a couple commercial crossovers they might give you a general idea. Hope I'm getting what you're asking, and if this was entirely unhelpful or too rudimentary, my apologies.

jacob

[Johan]

don't know how it translates to your situation. but, when mixing my bands demo's, I usual find I can lowcut bass below ~45Hz and guitar below ~110Hz before it start to hurt what I percive as relevant in those instruments
listening to recorded instruments and the playing those same instruments live is different things thou...
J

[R.G.]

Low E for a guitar in standard tuning has a fundamental of 82Hz. Bass is one octave down, so low E for a four string electric bass is 41Hz.

You can calculate the frequency of any even-tempered note by remembering that A=440 is the standard for modern tuning, and that notes change by a multiplier of the twelfth root of two. This is approximately 1.059463094, but most scientific calculators will quickly calculate two to the 1/12 power for you; that's what I just did. You skip octaves by dividing/multiplying by two  (A =440, 220, 110, 55...) and then multiplying/dividing by the twelfth root to get to the individual note.

I should have noted first that with the prolifieration of six, seven, eight string guitars and basses, you will need to find out where the lowest strings are tuned and take that into account.

The highest note on an electric in standard tuning is four octaves up from low E (on a 24 fret guitar) at 1312Hz, but harmonics go out to about 7kHz or so.

[petemoore]

  PRecisely the information I need for Ballparking !
  I think a bit of bass ext. via cabinet'd be a really nice sound from what-else..I gotta lotta stuff can be tried out here.
  And the tower concept seems perfect for stage [small footprint/speakers off the 'scoots-the-sound-directly-out-front' plane' =the floor].