SPL max and dipoles XLS

[Raka]

Hi,

I've saved the money, and I'm about to buy the drivers for my dipoles project.
The tweeter is a 9700 I already have a pair. The doubts are the midrange and woofer, as you can expect in a dipole the problem is the xmax and SPL max.
I'm almost decided to use the XT18WO09-08, with Sd=129cm² and Xmax=5mm (I think peak to peak). In a narrow baffle, the max spl I can get within the linear excursion at 100Hz is 90dB, and at 120Hz is around 95.

My question is: Are those 90dB and 95dB good enough?

I'm going to use XLS from peerless, but don't know if the XLS10" or the 12". The 10" unit will go higher, but don't think more than 120Hz.

My problem is: How is the max spl I use at home, if I listen to chamber music, some classic, without disturbing a "standard" neighbour?

[BillFitzmaurice]

One of the things I do as an audio engineer is to monitor sound levels at a 6,000 seat pavilion. At the FOH high energy acts average 105-110dB; middle of the road rock and country/western runs from 95-100 dB, and orchestral music 85-90dB. If you can expect to get 85dB at the listening position with 5dB headroom you should be fine. Less than that may put a strain on your speakers and amp.

Disturbing your neighbors is a matter of how thick/heavy the walls are in your domicile.

[Raka]

Thank you very very much, this was exactly the answer I was looking for.

Linkwitz suggests using the 830500 as high as 150Hz, so if I cut there the max spl for the XT would be much more interesting.

Has anyone used the XLS10" and the 12"?

[5th element]

IMO you can probably take the XLS up to 200hz without any problems, they measure perfectly flat to 500hz so with a steep xover. Obviously flat doesnt describe how they sound at 200hz, but id guess OK. - My measured results and listening.

Another thing the XT woofer has 5mm xmax one way = 10mm p-p so you can squease summore SPL outta it.

[Sjef]

Using it up to 200Hz will only be possible with very steep crossovers like 60 or preferably 90db/oct. Not because of the driver but because of the very strong and long decaying resonace at about 230~250Hz of the Linkwitz open baffle woofer construction.

[Raka]

Originally posted by 5th element


Another thing the XT woofer has 5mm xmax one way = 10mm p-p so you can squease summore SPL outta it.

Are you sure? I read 5mm air gap height, I suppose that means peak to peak. Would be a great nice surprise if it's 10mm!!

[454Casull]

A cheaper alternative to the XT18 is the Peerless 850439.

The Peerless HDS 850439 is the definite leader in the performance versus price category for this group. It is well designed and built.

http://www.linkwitzlab.com/x-mid_dist.htm

http://www.partsexpress.com/pe/pshow...number=297-638

[Rudolf]

Using it up to 200Hz will only be possible with very steep crossovers like 60 or preferably 90db/oct. Not because of the driver but because of the very strong and long decaying resonace at about 230~250Hz of the Linkwitz open baffle woofer construction.

While I am NOT using the XLS:
If it is a H-frame dipole the resonance may be at about 230~250Hz, but not very strong.
If it is a W-frame the resonance will be stronger, but almost certainly way up in the range 330-360 Hz.

I got acceptable results with a H-frame and 24 db/200 Hz lowpass. Room modes do MUCH more to contort SPL levels around 200 Hz in my room than the H-frame resonance.

Rudolf

[5th element]

Originally posted by Raka



Are you sure? I read 5mm air gap height, I suppose that means peak to peak. Would be a great nice surprise if it's 10mm!!

Yes your are correct that the gap height is infact 5mm (the other XT woofs is 4mm) but the coil height is 14mm. Now these are overhung motor systems so to get p-p xmax you tak the coil length and take away the gap height. So 14-5 = 9mm p-p or in the case of the other XTwoofs 14-4 = 10mm p-p.

[Raka]

Originally posted by 5th element


Yes your are correct that the gap height is infact 5mm (the other XT woofs is 4mm) but the coil height is 14mm. Now these are overhung motor systems so to get p-p xmax you tak the coil length and take away the gap height. So 14-5 = 9mm p-p or in the case of the other XTwoofs 14-4 = 10mm p-p.

Oh yes!! I like to be wrong this way!! Certainly, those are good good news. Thanks 5th element!!

454Casull, I also studied this driver, and looks good, but I have a friend that recommended me the XT as he told me it sounds very good, very good.