Amplifier recommendation for DIY speaker build please.

[Zek]

Get this 4 inch “full range” instead (same company, same sensitivity) and go back to plan A + hybrid of using the exciter speaker for the top end off the preamp I already have.

With such a 4 ”speaker you won't have a bass at all.
I don't know how you imagined that with an Exciter speaker you get a high -tone area you miss in 4 ”speaker?
How can you do with the preamo to drive a speaker?

 

[CPTX]

I’ll be using the 8 Ohm 8 inch full range driver (from the initial post) with the new 8 Ohm 4 inch driver full range driver from the same company that also has the same sensitivity in parallel…both driven by the Aiyima A07max in mono mode

Then, exciter speaker off the preamp (done that before).

 

[CPTX]

I have two active subs I can run off the preamp if it’s bass deficient….but I’m not worried….the primary goals are fun and learning experience.

 

[CPTX]

Now looking at series parallel to protect the smaller drivers. So, two smaller four ohm drivers wired in series together and then parallel with the larger eight ohm driver.
All drivers with the same sensitivity.

 

[CPTX]

Two of these in a series:

then wired in parallel with one of these

 

[CPTX]

Now reading about baffle step vs mini DSP vs EQ for full range drivers. Oh jeez…the irony of trying to keep it simple within the realm of speaker design and electrical engineering.

 

[CPTX]

I also failed to mention how acoustically poor the room is that this speaker will be located.

The 2 cubic foot cabinet (15.5”x15.5”x15.5”) section for the 8 inch full range driver…..and the active subwoofer I will likely be utilizing (pictures of the two below)

I’ll be building the cabinet section for the two four inch full range drivers this week. My instinct is to build them a bit wider than typical for two four inch drivers (12” wide x 8 “ deep x 16” tall) to minimize the need for a baffle step)

Also leaning toward mini DSP instead of incorporating baffle step as this garage room’s acoustic properties are so poor…..could always add later.

 

[DVDdoug]

Yes, this will be a speaker in mono.

You'll need a mixer to mix the left & right signals. You can't "short" the connections together.

If your source is a computer there is probably a mono setting to do it in software.

With line-level signals you can make a simple passive mixer with two resistors, or an active mixer with op-amps, or you can buy a little mixer.

There's no practical way to mix speaker-level signals.


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If I was building an inexpensive speaker, I'd use a coaxial (or triaxial, etc.) car speaker with a built-in tweeter and some kind of built-crossover. The crossover in these speakers is usually just a capacitor to the tweeter, or with a piezo tweeter they can get-away with no crossover.

And the bigger the better. 6x9's are usually the best way to get a large-inexpensive car speaker. You can find 8-inch car speakers but they tend to be more expensive. (Bigger car woofers are common but 8-inches is usually the maximum for a full-range coax.)

They are usually sold in pairs so you'll get an extra speaker. You can put both in the same box if you want for stereo, or since they are usually 4-Ohms you can wire them in series for 8-Ohms mono.

Note that two speakers in the same box usually raises the tuning frequency (with less volume for each speaker) so it's a trade-off with more cone area.

Have fun!!!

 

[CPTX]

Thank you for the assistance; very helpful

Just for clarification; this is my thinking below…this doesn’t work?

What if I were to use a pre amp with a non crossed over full range sub out (mono) intended for an active sub; and then ran this to the Aiyima A07 max in mono mode? This way I keep the signal in mono the whole way.

Pre amp with full range sub out with no crossover or pass filters.

 

[CPTX]

^^^^
If that doesn’t work, then I could use one of these via the speaker line outs on the preamp pictured above…then Y adapter to run one mono signal to the Aiyima A07max in mono mode.

The preamp/amp I’m using only provides about 15w RMS per channel, but if that’s enough to drive some smaller satellite speakers (say the Dayton Audio MK402x)…then I’d use the high level input option on the sub from the preamp so have satellite speakers in stereo and use the DIY speaker as a mono main central speaker (presuming I can use the sub out as full range mono to the Aiyima A07max then to the DiY speaker)

Picture of the back of the sub and the specifications of the intended preamp

 

[CPTX]

Top cabinet section coming along (just need to borrow my neighbor’s nice saws). The speaker line out RCA converter arrived and works great for connecting the two preexisting amplifiers I already own without introducing any audible distortion (enabling me to use the lower powered A/B amp as a preamp to the higher powered other amp). Waiting on a couple drivers from parts express and the Aiyima A07 max from China.

Also found a used copy of The Loudspeaker Design Cookbook - Vance Dickason …and ordered …looking forward to reading it.

 

[CPTX]

A07max making its way through customs

 

[CPTX]

While I wait on customs

 

[CPTX]

Thanks to y’all’s expert advice the speaker turned out better than I imagined. The Aiyima A07max pushes it with ease in mono mode…..only using 25% of the volume knob.

Excellent for reproducing in game sports sounds and spoken dialogue. Really emphasizes clear vocals. Can’t wait to watch the Olympics along with some NCAA and NFL football on this.