Cabs Recommendation for LE14

[ngccglp]

Hi,

I am thinking of starting a project based around the LE14. Anybody has a cabinet plan that I could used? I tried to look up the plans in the libarary but couldn't find any. Thanks.

[4313B]

1.8 to 4.0 cubic feet tuned to 28 Hz to 30 Hz.

[ngccglp]

Hi Giskard,

Could you also kindly advise on the port size and length? Actually, is there a baffle design that only has an opening (sort of like the Altec A7) but w/o any duct? It would be much easier to fabricate.

Thanks.

[Robh3606]

Hello ngccglp

You need the internal volume to calculate port size depending on the box tuning. You can get a free box program here WinIsd

http://www.linearteam.dk/default.aspx?pageid=winisd

Or use the clasic boxes JBL used from the plans section:

http://www.lansingheritage.org/html/.../jbl-plans.htm


Rob

[Hamilton]

I just built a pair on Zilch's recommendation using the L200t3 layout, but brought the internal specs down to 3.5 cu. ft, (2) 3" ports 8 ½" long for LE14As.

http://manuals.harman.com/JBL/HOM/Te...200t3%20ts.pdf

[ngccglp]

Thanks. Will give the software a go asap.

Hamilton, nice cabs.

[ngccglp]

I think I have figured out the way to design and tune a bass cab to the required freq. However, I need advice on the optimal shape of the curve. I noticed a hump around the tuning freq as I increase the freq values, same thing happens when I increase the volume.

Is the objective to smoothen out the hump or is it OK to have a bit of the hump?

Thanks.

[4313B]

These days the goal appears to be to get a nice banana curve that will self equalize when placed in a typical room.

I actually took a minute to run Hamilton's implementation mentioned above in BB6P and here's the result:

Usable response to ~ 25 Hz with a nice ~ 18 dB/octave rolloff as expected with a quasi-third order alignment.

[4313B]

I just built a pair on Zilch's recommendation using the L200t3 layout, but brought the internal specs down to 3.5 cu. ft, (2) 3" ports 8 ½" long for LE14As.

http://manuals.harman.com/JBL/HOM/Te...200t3%20ts.pdf

http://audioheritage.org/vbulletin/s...&postcount=295

http://audioheritage.org/vbulletin/s...&postcount=307

http://audioheritage.org/vbulletin/s...&postcount=308

[gerard]

Hello


Question for Le14 ?.

What is the best : 1 bigger port or 2 small ones like the picture ?

Gerard

[Titanium Dome]

The LE14H-3 is dual ported to the front in the PS1400 enclosure. It uses "Freeflow" flared tubes. The cab is approximatley 15x20x19.

[Hamilton]

Giskard, the stock nL200t3 was WAY too hot in HF, we ended up installing a fixed L-pad, around -6 db I believe; Zilch drew up the schematic.

[4313B]

Zilch drew up the schematic.

Post it.

Giskard, the stock nL200t3 was WAY too hot in HF, we ended up installing a fixed L-pad, around -6 db I believe.

There is absolutely no way the 14" LE14 is 6 dB less efficient than the 12" 120T3. What components are you using?

[4313B]

Hello


Question for Le14 ?.

What is the best : 1 bigger port or 2 small ones like the picture ?

Gerard

A single larger port is always the best bet, but multiple ports can be used if compensated for. I usually go with dual ports myself.

[Robh3606]

What's the DCR on L1 the coil across the driver?? Should be 7.5 ohms.

Rob