Isobaric - less then $20

[NEO Dan]

TC Sounds? Here's an 8" version:

http://www.amazon.com/gp/product/B0...&pf_rd_t=101&pf_rd_p=470938631&pf_rd_i=507846

Nope, it's an ancient Chinese secret. I've not had any TC Sounds OEM product in many many moons. I dunno if they are even a build house anymore.

 

[ODougbo]

Somebody must be building them...there's a whole page of them on PE.

That magnet/frame/surround have similar features to your 15".

They look interesting; check out the 10", the $$ is reasonable.

http://www.parts-express.com/wizard...pe=main&WebPage_ID=3&searchFilter=alltcsounds

 

[2009thread1]

i just finished building a T-line enclosure for one of my jbl gto804's, sounds great so far !

 

[ODougbo]

Pics?

My tiny 6.5 woofers were sounding great last night, they surprise me every time I hear them. (some rain yesterday).

I might have to up the ante and install 3 double boxes (12 drivers).

I may never go to work again,,,,,,,,,,,,,,

 

[2009thread1]

check out transmission line subwoofer testing - YouTube it's there 😀

 

[ODougbo]

Hey my speaker's big brother...Very cool.

Is the amp across the room? You may be losing some bass if so.

Best to keep the amp close to woofer - and still use 12gauge (min).

 

[2009thread1]

my amps inbetween both subwoofers, about 3m away from the subs

 

[ODougbo]

New Pics

I hope this works

 

[2009thread1]

I hope this works

what's the point in placing the woofers like that ? it looks amazing though ! 🙂

 

[ODougbo]

I get looking at it;optical illusion, but it is square.

The woofers are suppose to cancel out something...Oliver will tell us.

Curious if a straight box has an advantage over a pin-ball machine design????

Btw, It was not hard to build. On a 1 -10 scale, I'd give it a 4. About $60 into this.

They sound nice, go deeper than expected, not hard hitting, more of a "soft" bass; very easy to listen too........

 

[tb46]

Hi ODougbo,

"...Oliver will tell us..."

Just two quick references:

Push-pull Slot Loading (PPSL) sub drivers? - AVS Forum

and

http://www.diyaudio.com/forums/subwoofers/177905-thread-those-interested-ppsl-enclosures.html

I really like what I see in Post #288. 🙂 Very well done.

Regards,

P.S.: One minor suggestion:

 

[tb46]

Hi,

I'll add one more note that I think applies to this design, it's by djk:

Regards,

 

[ODougbo]

Yes - more good ideas. I've looked at both those areas a couple of times.

Will do.

Hi ODougbo,

"...Oliver will tell us..."

Just two quick references:

Push-pull Slot Loading (PPSL) sub drivers? - AVS Forum

and

http://www.diyaudio.com/forums/subwoofers/177905-thread-those-interested-ppsl-enclosures.html

I really like what I see in Post #288. 🙂 Very well done.

Regards,

P.S.: One minor suggestion:

 

[2009thread1]

Yes - more good ideas. I've looked at both those areas a couple of times Will do.

with my current setup at the moment my book shelf speaker (q acoustics 2020i) will bottom out before my subs do, meaning i cant turn it up as much, is there anyway of cutting the low frequencies of to my bookshelf speakers without doing the same to my subs ?

 

[ODougbo]

Sounds like you need a active crossover.

You'll have to go intot more detail on your equipment on hand (or willing to buy).

Never bottom out speakers :-\

 

[bjorno]

2009thread1

..is there anyway of cutting the low frequencies of to my bookshelf speakers without doing the same to my subs ?..

Hi,

Why not just plug the ports on your box-shelf's. Start testing with a filling that do not produce a wheezing sound..This would move the f-3dB up to a better integrating point and protect the driver from over-excursion.

BTW. I thought you have built a T-TQWT...Do you have any simulation script of your TL?

b🙂

 

[ODougbo]

BTW....I watched the 1/2 hour of original Ghost Rider last night. The voulume was louder than I though and it about threw me out of the chair when it got going....the system roars like a lion.

The mini 6.5" don't sound mini (using 8)

 

[2009thread1]

Sounds like you need a active crossover.

You'll have to go intot more detail on your equipment on hand (or willing to buy).

Never bottom out speakers :-\

my stereo amplifier is a denon pma710ae, with the q acoustics 2020 bookshelf speakers, and ixos champagne speaker cable, the subwoofer amplifier is a pa amp i bought for £110 which is 250 watts rms two channels, 500 total.
i never bottom them out but the subs will reach half excursion when the bookshelfs are as loud as i'll push them

 

[ptempel]

Mini house wrecker?

Would be interesting to use all four 6.5" drivers in a smaller version of this enclosure:

HWK15

Anybody ever try something like this? Read about it in another thread from 60ndown:

http://www.diyaudio.com/forums/subwoofers/198175-isobaric-lovers-only.html#post2741693

Looks cool but more complex to build, unfortunately.

 

[ODougbo]

ptempel....Did you see Post #14 here:

http://www.diyaudio.com/forums/subwoofers/205896-6th-order-bandpass-design-dual-6-5-a-2.html