6th order bandpass design for dual 6.5"

[permo]

permo,

I don't think you would run out of power, the drivers are small and can't push them that hard in the first place. The big avantage is they don't cost much, I would suggest using more of them, at least 4....maybe double Iso.

Just a thought here...did you ever measure the parameters of this driver?

 

[tb46]

Hi Y'all,

Here is a quick simulation for the 299-114 in push-pull using WinISd. The enclosure will be app. three times as large. I'd go with multiple of the smaller enclosures, using something like the Geddes multiple subwoofer approach.

Regards,

 

[permo]

Thats definetly too large. I will have to run 150 watts through your single iso 6th order box in winisd and see what the possible output at 1 meter would be....it's around 116 db with the dual driver setup, I am assuming 110 or so with the single iso. That may be adequate.

 

[ODougbo]

I think I did this right (plz check)

I put 2 pair Iso with a 10"PR, it looks pretty good, easy build!

Sorry about the word files...I don't know how you all post screen shots.

 

[permo]

I have been tinkering and tinkering and I am going to make two drivers work in around 2 cubic feet, but I am hard pressed to beat the 6th order. Here is a graph of 6th order vs vented...........

Now the question remains...pvc ports? Slot Ports? Down firing PVC ports into a slot? ETc...etc....

I am now aiming for a long, tall, narrow enclosure that I can fit between my couch and the wall. Maybe 10 inches in total width, 20 inches tall and long enough to get the volume.

 

[ODougbo]

I couldn't sim that in my WinISD program, even went back to perfect box, about the same resuts.





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"they're pretty....real pretty. But can they fight" Dirty Dozen 1967

 

[permo]

I couldn't sim that in my WinISD program, even went back to perfect box, about the same resuts.



_____________________________________________________________

"they're pretty....real pretty. But can they fight" Dirty Dozen 1967

I wonder if we shouldn't compare TH parameters? I will post what I am using when I get home tonight. I suspect that is the difference. I bet I entered something incorrectly.

 

[tb46]

Hi permo,

I think I got the T/S parameters correct. It definitely has a lot more output. This will give you something to compare to.

Regards,

 

[permo]

Hi permo,

I think I got the T/S parameters correct. It definitely has a lot more output. This will give you something to compare to.

Regards,

I am torn between this design and the TQWT......I haven't picked an amplifier for this yet, but I am again leaning towards the dayton APA150 with it's built in 20hz subsonic filter. So maybe the 30hz TQWT won't work so well with that amp.

 

[tb46]

Hi permo,

Both enclosures have similar size requirements, and similar output levels. The T-TQWT goes lower (T-TQWT: -3DB @ 26Hz, avg. SPL ~ 88.6dB v. PP-BP6: -3dB @34Hz, avg. SPL ~88.7dB). With both enclosure types you'll need a low-cut filter (high pass), 20Hz doesn't sound unreasonable (maybe you can modify it to 25Hz?).

Regards,

 

[permo]

Hi permo,

Both enclosures have similar size requirements, and similar output levels. The T-TQWT goes lower (T-TQWT: -3DB @ 26Hz, avg. SPL ~ 88.6dB v. PP-BP6: -3dB @34Hz, avg. SPL ~88.7dB). With both enclosure types you'll need a low-cut filter (high pass), 20Hz doesn't sound unreasonable (maybe you can modify it to 25Hz?).

Regards,

Shoot......T0TQWT or 6th order...both really cool designs.

 

[ODougbo]

you all fillter out below 20hz - 25hz? I simply set the xover at 80hz and that's it.

 

[permo]

you all fillter out below 20hz - 25hz? I simply set the xover at 80hz and that's it.

Yes, this is to protect the driver from overexcursion below the low frequency limit of the enclosure.

 

[ODougbo]

That's cool, never use one; haven't blown a speaker in years.
Actually the processor has a bass limit setting, but never set it up.

Not sure you would need a lower end xover for music, unless you like overtures or something.

 

[permo]

That's cool, never use one; haven't blown a speaker in years.
Actually the processor has a bass limit setting, but never set it up.

Not sure you would need a lower end xover for music, unless you like overtures or something.

I think a lot of hometheater content (explosions, jets,doors slammming) has the potential to be subsonic.

That being said, i have used 4th and 6th order bandpass with no subsonic and it was just fine...just tempting fate though.

 

[tb46]

Hi,

It is amazing how much less than "rated" power we normally use in the home. Anyway, a low-cut (high-pass, sub-sonic) filter is a good thing. You should really take a look at stuff like that in Hornresp. I'll attach an example:

Regards,

 

[permo]

Maybe I should change the tone/purpose of this thread:

Lets put size restrictions to bed. For two of these drivers, what would be the optimum enclosure from an efficiency and low frequency perspective?

On another note, I just picked up a NHT SA-2 to power this project. 125 watts rms.

 

[ODougbo]

Post #31, the t-TQWT goes 8db lower.

Here is another thought, if you build one and think you want more...can always add a second box to the bottom OR side (I did this 3 times).

Hard to keep quiet about the ones I built , I'm having a blast!!

 

[permo]

Post #31, the t-TQWT goes 8db lower.

Here is another thought, if you build one and think you want more...can always add a second box to the bottom OR side (I did this 3 times).

Hard to keep quiet about the ones I built , I'm having a blast!!

On another note, you figured out how to attach thumbnails!


I only have two drivers and 125 watts, I have no doubt that the single 1/4 pipe would be fine for my listening room. I also have no doubt that the 6th order would be fine too.

I think that the increased low frequency extension of the 1/4 pipe is sure nice. I am wondering how large a tapped horn would have to be for these two drivers? I am willing to go 48" in length for the enclosure as I am simply going to fit it behind my couch.

something like this....except with two drivers? I am afraid our poor little 6.5s don't have the excursion tho...

http://www.avsforum.com/avs-vb/showthread.php?t=1238398

 

[tb46]

Hi permo,

Let's compare the dual T-TQWT v. a (much bigger) TH-both @ Xmax-in Hornresp.

Regards,