Another DIY in the books

[eddantes]

Just wanted to share a completed project. Unfortunately I never managed to do real measurements - just a real quick scan, before they were gifted. A small ported speaker designed for a small apartment using the Peerless BC25SC0604 and Dayton TCP115-8. Plays into the 50s, though not as flat as I had hoped, but the worst of it - is that my simulated tweeter polarity had to be reversed in reality, I guess I messed up in VCAD. They do need some amp power though.

The crossover (measured values using an LCR meter).

Horizontal gated. Better at listening window than on axis I think. Generally OKish.

Impedance. Abit of a mis-match between speakers. I may have messed up one of the ports a bit, but close enough.

Anyways - just wanted to share - I think I am getting better at this. Still aways to go.

 

[Ktacos]

but the worst of it - is that my simulated tweeter polarity had to be reversed in reality, I guess I messed up in VCAD

That's a really good "worst" to have.

Simple circuit, low cost parts. Looks like a great build.

 

[eddantes]

That's a really good "worst" to have.

Simple circuit, low cost parts. Looks like a great build.

Thank you. What I meant by "worst" is that it means my sim was not trustworthy, so it puts into question if anything is what I think it is. Need to work on my measurement technique and my understanding of Vcad limitations. Next project - I'll try to measure in a test box before commiting.

 

[eddantes]

BTW - Here is my box sim. I think the actual build may be closer to 3L, which would be largely inconsequential I think.

 

[mhardy6647]

is that my simulated tweeter polarity had to be reversed in reality

maybe it's an Australian design, and you had to take the Coriolis Effect into account?


sorry... I'm so sorry...

 

[eddantes]

maybe it's an Australian design, and you had to take the Coriolis Effect into account?


sorry... I'm so sorry...

I almost clicked the "report" button... almost ;=)

 

[mhardy6647]

I almost clicked the "report" button... almost ;=)

Understood. Some things do need to be stopped!

 

[Ktacos]

Thank you. What I meant by "worst" is that it means my sim was not trustworthy, so it puts into question if anything is what I think it is. Need to work on my measurement technique and my understanding of Vcad limitations. Next project - I'll try to measure in a test box before commiting.

Considering the only thing one has to do to match the sim is wire the tweeter in the polarity that results in a matching response, I'd say it's still trustworthy data. Not really a big deal.

 

[alex-z]

The difference in bass tuning might be natural variance in cheap drivers.

Nice result for such cheap drivers + crossover

 

[Surfrat]

Good looking speakers...