Best driver types for a 5 inch diameter cylinder?

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So I am new to this, but I am planning on building a quality pair of speakers powered by an AB amplifier. The material of the cylinder will be thick aluminum. My budget for each driverranges from 20-150$. The only issue is that I don't know how to judge drivers apart from cost. I am trying to achieve the best possible sounds from 5 inches.

Option 1 would be a quality full range speaker

Option 2 would be a smaller 2-way configuration.
The tweeter would be around 1 inch and the woofer would be 3.5 inch.

Option 3 would be a coaxial driver like this one
B&C 4CXN36 4" Professional Coaxial Speaker 70 x 70 8 Ohm
 
Welcome to the forum!

I like the look of the coaxial speaker, but mainly because it is the only one whose specifications you have made available.

https://www.parts-express.com/pedocs/specs/294-6048--bc-4cxn36-spec-sheet.pdf

In common with other 4" speakers, the bass resonance frequency is high (94Hz) so it would require the addition of a subwoofer for anything other than desktop use.

You would have to determine the internal volume and mode of operation (sealed/vented) of your pipe enclosure in line with the published parameters of the speaker.

Since you say you are new to this, I have to ask if you are familiar with Thiele/Small Parameters.

Thiele / Small parameters explained with real world cases
 
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A tube with 5" outer diameter means that you must have a speaker driver that can be fitted in the end of it - so nominally a 4" driver. In that size there is no real benefit of using a coaxial, unless the unit will be part of a 3-way speker with separate bass unit.

The benefit of a tweeter comes from it's smaller diameter and therefore wider dispesion of high frequencies above 5khz. The area of the tweeter is off from bass-midrange driver's surface area, which greatly harms bass capabilities in this size range.

A round 5" baffle gives no support for bass, so the poor 4" driver will need 6dB of boost below 1kHz! Do not expect much better sound than a table radio gives... A high quality speaker design is extremely difficult bunch of restraints and compromises in this size! A dsp helps to get sound balance right, but distortion in bass can not be avoided.
 

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