3 way sealed speaker

[Vineethkumar01]

Will try reversing the polarity and check first. Already the mid and tweeter are reversed with respect to woofer though.

It is the relative phase between drivers that matter. In that sense even if you have physically reversed the polarity, the mid may still be put of phase with the woofer and tweeter

 

[007india]

View attachment 88874
View attachment 88875
Hi folks,

Happy to present my first serious audio project. A DIY Speaker build. After a couple of months of design, and couple of weeks of sourcing and building the speaker is ready. The speaker itself was ready 3 weeks back, but was waiting for the Dayton calibrated mic to arrive to do an objective measurement. Got the results now, what do you think? Of course the SPL chart is not really the speaker performance alone, it is the speaker+room combination. Recorded at 75dB. Comments and suggestions are most welcome.

The design is a sealed unit. I do not have the time to tune a port so stuck with a sealed design. It started of as a 2 way system but eventually became a 3 way. The midrange is actually a midwoofer which I had already bought for the 2 way. But it worked out well. Peerless 1" tweeter + Peerless 6.5" mid woofer + 8" Peerless Woofer. The crossover was built with cutoffs at 300 Hz and 4000 Hz. The cabinet was built with 19mm MDF and finished with mica to suit my living room. I chose high sensitivity drivers for the tweeter and mid woofer (originally it was to be 2 way design) so that my small Fossi amp could drive them. Later on, I had to attenuate them in the crossover to match the woofer.

It ended up exceeding my expectations! Thoughts and comments most welcome.

Regards,
Arun

Nice work. Still I would love to have a dome midrange to complete this lovely setup. Also, did you tried to use AMT?
2) Is there a Bass port/horn or bass radiator?
3) Pardon my ignorance, if its 3way, then cross over should also be built for 3 way? (Ex: 150Hz, 1.0kHz, 6.0kHz). You had mentioned only 2 cut offs
4) Does this support bi-wiring ?
5) Speaker box rear enclosure could have been curved inside. Nice addon.

 

[arunvenkats]

Nice work.

Thanks!

Still I would love to have a dome midrange to complete this lovely setup. Also, did you tried to use AMT?

No.

2) Is there a Bass port/horn or bass radiator?

No, wanted to make sealed unit by choice.

3) Pardon my ignorance, if its 3way, then cross over should also be built for 3 way? (Ex: 150Hz, 1.0kHz, 6.0kHz). You had mentioned only 2 cut offs

The 2 cutoffs for a 3 way:
Woffer < Cutoff #1 < Mid < Cutoff #2 < Tweeter

The 2 cuts creates 3 sections. 3 way speakers will have only 2 cut off frequencies, dividing the frequency spectrum into 3 regions.

4) Does this support bi-wiring ?

No.

5) Speaker box rear enclosure could have been curved inside. Nice addon.

Sorry, I did not understand. Can you elaborate?

Regards,
Arun

 

[007india]

Can you share the contact of Chennai guy who did the assembling + wood work ? Did he also provided a custom made cross over ? My wish is to have a 3' high floor stander with separate inside horn for silk dome tweeter and dome midrange and Down firing 8" woofer. The horns for the 3drivers will be separate and ported to front.

 

[007india]

Thanks!



No.



No, wanted to make sealed unit by choice.



The 2 cutoffs for a 3 way:
Woffer < Cutoff #1 < Mid < Cutoff #2 < Tweeter

The 2 cuts creates 3 sections. 3 way speakers will have only 2 cut off frequencies, dividing the frequency spectrum into 3 regions.



No.



Sorry, I did not understand. Can you elaborate?

Regards,
Arun

For curved back, refer to wharfedale 9.6 floor stander design. It's a lovely speaker imo.

 

[007india]

For cut off, I got this from wharfedale 9.6 which is 3 way, 150Hz, 1.0kHz, 6.0kHz. This is having 3 bands for a 3 way. Pardon my ignorance, im totally new and just started.

I see many commercial drivers use circular rubber pads or also called as suspension near cone. Is it useful?

 

[007india]

Sample cut off range: can we get a DIY cross over and driver to support this range ?

Super tweeter: 6..20khz
Tweeter : 4...6khz
Midrange : 250hz...500hz...2khz...4khz
Woofer : 60...250hz
Sub woofer : 20...60hz

 

[diyaudio]

Crossovers are necessary evil, theory is lot difference from practice, passive crossovers are part art part science, a 5 way is a strict no no for a DIYer, the lower the number of ways the better. Better to go active with a 2 way and then add a sub, amps are pretty economical these days so is DSP

 

[yogibear]

Another stint could be 3 way, with a 2 way passive and woofer active in separate cabinets.

 

[diyaudio]

Another stint could be 3 way, with a 2 way passive and woofer active in separate cabinets.

Much simpler and DIYable

 

[007india]

When I used wharfedale 9.6, I don't feel the need to have separate sub woofer. Is it possible to replicate 9.6 in DIY.