Collaborative Tapped horn project

[rhapsodee]

Hi,

I've been trying to sim this driver using Horn Response, but can't seem to get a flat output curve.

Am i doing something wrong with the parameters?

[rhapsodee]

This is the response.

The first peak is very low at 16 Hz, and low in magnitude as well...

[Don Snyder]

You're modeling the data as a front loaded horn, and it's doing exactly what you're asking it too. If you want a Tapped Horn
you need to tell it so ... see HornResp Help.

[MaVo]

Originally posted by rhapsodee
Am i doing something wrong with the parameters?

Hornresp->Tools->Driver Arrangement->Tapped Horn->OK

[2100]

Originally posted by MaVo


Lower the crossover point and use one with a higher order. What you hear are the high frequencies, bouncing around in the horn.

Ditto, I realised that the TH-112 is definitely not happy with a 2nd order xover even with a sharp BW-12, unless its crazy low (and then it won't gel with my Lambda TD15M-A). Its BW-24 varying between 80-90Hz now with some EQ to rid the peaks @ LP.

No felt or damping in my TH-112 though.

[2100]

Guys, my TH-112 uses a slightly modified LAB12 (but still 13mm Xmax probably), the cab is ~ 300L and I think some of you know the folding.
Do you think that Xmax is reached at 30Hz with 800W?

Here's some clues with the FR graph (28V 10m). Its 101dB @38 and drops to 95dB @ 30.

Thanks!

[rhapsodee]

Hi,

I have corrected the mistakes pointed out earlier, now seem to have a response that looks relatively like a tapped horn.

I'm concerned about the large 10dB dip at 40 Hz, as Tom Barker found out when he built his tapped horn that the dip did not fully fill out.

Comments and feedback appreciated!
http://www.lsdm.co.uk/doggspace/tappedhorns.html

[rhapsodee]

This is the input parameters.

Thanks!!

[jm_kzo]

Hi Tapped Horn gurus,

for this project, I will soon start investigating the bass element.

I have difficulties measuring how low my mains go (will go) but measures seems the show the go down to 100Hz and I think the go a bit below.

The use has shifted a bit, it was pure HT but is now back to 50% hifi/50% HT... I like the sound of the mains too much to use them only for HT .

I will need to cover from 100/80Hz down to 30Hz. I know I could target lower, but I am not too keen on having to deal with room modes and so on (if I understood correctly, they can be nasty below 30Hz).

I have not settled with a technology yet (I mean sub technology, sealed, veted, BP, TH), but I have been following the various TH threads with interest. As I am working on my mains, I have a Beyma 10G40 lying around doing nothing.

I got hooked by the extended response (is it unique to TH though ?) and (mostly ) by the "bass for money" ratio as TH seems to achieve the kind of output usually devoted to $$$ large speakers.


Playing a bit with HR, it could look like this in a 4m TH.


Question 1 : do you think it is worth the wood and time to give it a try or the curve is too uggly ? The driver might be a bit too luxurious for TH, but it is the one I have available for test.

Question 2 : Any chance to get rid of the spikes in the "red area". I tried changing various sizes at length, but the best I can achieve is compromising the rest of the response. I see some have added coils, is it the way to go ? (I assume it either change drive parameters or just act as a low pass filter).

Question 3 : I currently have no DCX or Reckhorn or thing of the sort, just an HT amp (and 2/3 old hifi stereo spare amps), how can I try this with my limited hardware ?

And I have to say I am a real noob, but willing to learn .


[EDIT] The simulation is for 20w where the driver seem to reach Xmax...
[EDIT 2] I used spec sheet parameters...

[tb46]

Hi raphsodee,
For what its worth: check the T/S parameters in your input data, there are disagreements between the factory data, the data you entered, and the data Hornresp calculates. Ideally you should measure the data for the unit you are using, otherwise you are just guessing.
Regards,