Jean Michel on LeCleac'h horns

[jzagaja]

I have simulated several pro drivers and this one from STX seems good for this task? I could get better only with a large closed box. Isn't better show combined path at 2m at listening position?

This is 16Ohm woofer so Eg=4V.

[revintage]

Hey Jean-Michel,
I guess corner loading is mandantory for this concept as you also recommended that in my 414 project a few posts back? Think this also incorporated an added R that made sensitivity low?

Hey Jack,
Find a driver with lower Mms. This will give you a bandwith so you can go for a 1" inch driver and a smaller horn, like your JMLC-400. What was wrong with the low cost 12" you suggested me? It will not need the high compression the 15" gives together withe the JMLC-200.

[Jmmlc]

Hello Jack,

The difference of path we indicate in the "combined response" module of Hornresp is not related to the listening distance.

It is the difference of path travelled by the rear wave compared to the front wave. In the case of the Horn Open Baffle the difference of path is roughly a bit larger than the distance between the troat of the horn and the edge of its mouth + some additional.

See attached Hornresp help file related to the combines response.

Best regards from Paris, France

Jean-Michel Le Cléac'h

Originally Posted by jzagaja

I have simulated several pro drivers and this one from STX seems good for this task? I could get better only with a large closed box. Isn't better show combined path at 2m at listening position?

This is 16Ohm woofer so Eg=4V.

[revintage]

Jack,
I just simmed the gdn30-400-8SE and it didn´t sim as good as I remember.

[jzagaja]

Yes you need a typical large woofer optimized for OB

[revintage]

Do you? This is the 414 with 10ohm in series....



Low sensitivity though.

[jzagaja]

Uhmm can't we find modern replacement ?

[revintage]

This is the "El Cheapo" STX with 6ohm! Used the wrong "path difference" before.

[jzagaja]

Question remains why we use a half of available JMLC200 mouth area and can we improve performance a little bit with lower cut-off.

[jamikl]

Probably off topic here but I would like to ask jmmlc whether the above is taken into account in horn response calculations. I ask because I have been modelling some front loaded horns working off an offset H baffle type open baffle and the results look good. I have used eminence beta 15A in the models as that is what I have and find difficulty in using them.

With two in an H baffle,8"or 20cm deep to the rear and a port opening equal to the H baffle cross section but .01cm deep and the front part of the H baffle about 8cm. deep but closed off to make a chamber with a throat area to the horn of 480 - 500sq.cm, mouth area 5000 - 600 sq.cm depending on profile, results look quite good. The lack of xmax shows up low down. I have modelled path difference as the length of the baffle plus the length of the horn. Is this correct.

This seems, generally to give better results than a bass reflex/horn combination. I suspect that better speakers would model quite well in this type of setup.
jamikl