x1 is it needed

It's the Föön E920HL. 2 18LW1400 in a box of 119,5cm height, 50cm width and 79,5cm depth. Hornloaded as said, horn path is 1,65m, but I can't tell throat size, mouth size or flare rate. I know from guys who are using much of them that the speakers start to make problems after some time....

Interesting story: Föön now got a subbass horn very similar to the LAB sub. It even utilises the same speakers..... but has a slightly shorter horn.

G'day Mike

>And youl still require several units to acheive desired response in 1/2pi

I don't doubt that for one minute, I even mentioned the fact on my webpage. I doubt it would ever be flat to 36Hz, 1/2 space, with any reasonable number of boxes. It is a 40Hz, small mouth bass horn, but in my room it behaves the way I'd expect a 30Hz horn to behave.

I guess you understand that a domestic listening room is far more constrained than a 1/4 space environment? I just tryed to reflect that fact in my model. This sub was not designed for pro sound, it is a domestic bass horn, and as such works better than I could have imagined.

BTW I don't ever recall seeing a model of any of Bill F's horns? The extreme small mouths and claimed low extension of his bass horns suggests to me he is using similar reasoning. Did you try to model one?

Cheers

William Cowan

G'day Philip and Mike

I guess I'd better jump in here to dispel some rumours. If you have a look at the following three images, you will be able to compare the model for the hornsubJr as I modelled it, and without the room influence (still 1/4 space), and compare the models with the actual measured response at my listening position. You will probably come to the same conclusion I did and agree that my published model more accurately reflects the measurement. LF extension is actually better than predicted. BTW the black trace is the raw response, the other trace has been tweaked in the DCX2496 crossover with a few stages of parametric eq.

http://diy.cowanaudio.com/images/hornsubjr_response.GIF

http://diy.cowanaudio.com/images/Jr_nocnr.gif

http://diy.cowanaudio.com/images/Jr_cnr.gif

Philip, back to your question, this little sub would be worse than useless in a 1/2 space environment, when used on it's own. 4 or more cabs and you will start to get useful response. I mentioned this on my webpage to make sure no one would waste their time making just one pair.

Cheers

William Cowan

Do I need x1 sub?

I have a small system that I am making; so far I have for midrange 4 cabinets with 2 12inch speakers in each 400rms per cab in the old dual fane design and then a horn on top of each cabinet for the highs. So far so good for me.

Bass wise I want to make a horn with 15inch fane driver design is off of

William Cowan’s DIY home page The Horn Sub Jr This is a 40hz bass horn

I will use just 2 off these 1 each side    nice small size

Would the system be improved if I add to it?

 X1 with void 18 1000rms driver

I have an active crossover and 31 band EQ all digital and running on 3 amps

I could get hold of a Europower EP2500 to power 2 x1s

Not the best but might work

I guess the

X1 would cross at

65khz

Horn Jr

65 to 200hz

This part is already very good for me

Dual 12s Mid

200 to3.5khz

High horns

3.5 to 18khz

Thanks for any advice I am a novice that’s having fun.