5-XLS's, 4-PR's, Adcom Mono Blocks and 1" MDF - diyAudio
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Old 8th March 2005, 02:24 PM   #1
DaHos is offline DaHos  United States
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Question 5-XLS's, 4-PR's, Adcom Mono Blocks and 1" MDF

Gee, now what can I do with all this stuff? The subs are 10" (home version) the PR's are 265g, and the Amps have LOTS of power.

I'm Looking for a well blended design for Music, HT and DVD/SCAD audio use. The only x-over/EQ I currently have is the low pass of my Denon 3803. I would be open for a over the counter active unit as my DIY skills in this area are none.

The mains are the Proac clones and the surrounds are a SS 8545/9500 combo.

I have also concidered selling the Adcoms and using the Adire ADA600 plate amps as they seem to be pritty nice.

The room is aprox 4m x 8m.

So any ideas, I am open to anything as no WAF is required ???????????

Thanks Much................
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Old 8th March 2005, 11:30 PM   #2
iz is offline iz  Denmark
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put the xls's in sealed Vas enclosures..... if it's the 10" XLS the enclosures should be 89ltr. pr. driver.... the good thing is that they have a gentle rolloff so you can place them near walls/corners..... like in the real world...

i guess that by PR's you meen passive radiators..... i don't like PR's so i would suggest not using them.... they are good for reducing the size of enclosures.... but not good for the sound of the sub...

build an active 24dB/oct crossover acoording to this http://sound.westhost.com/project09.htm and...... happy camping!!

did that myself for a friend.... never heard anything like it..... and i've heard quite alot i the past 20 years....
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Old 9th March 2005, 03:52 AM   #3
simon5 is offline simon5  Canada
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Well you could go for max SPL or a smaller design.

I would use the PRs to tune very low.

You could do two small subwoofers with an isobaric pair in each one, or a big box with 5 drivers and 4 PRs hehehe!

iz, did you hear a sub tuned under 20 Hz? Maybe not, maybe that's why you hate PRs so much.

Do you have the T/S parameters of your PRs?
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Old 9th March 2005, 08:56 AM   #4
iz is offline iz  Denmark
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"iz, did you hear a sub tuned under 20 Hz? Maybe not, maybe that's why you hate PRs so much."

i'm not sure what you mean...

yes i've heard sub with useable output below 20Hz... the 2001 overture is a must in sub tests... ....

the PR equipped speakers i've heard have a problem "stopping" after transients... almost like a bit of reverb... but i'm pretty openminded so the day i hear a really "tight" system i will (maybe) change my mind...

i think that PR's and ports are just there to ensure the WAF rather than the highest fidelity...
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Old 9th March 2005, 08:11 PM   #5
Raoul is offline Raoul  United States
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Hi iz. I think what simon5 is trying to accomplish by tuning under 20Hz is tucking the group delay, etc. below audible limits. The idea, then, is less about getting a response below 20Hz, and more about getting clean, tight output above 20Hz.
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Old 10th March 2005, 04:10 AM   #6
DaHos is offline DaHos  United States
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Quote:
Originally posted by Raoul
The idea, then, is less about getting a response below 20Hz, and more about getting clean, tight output above 20Hz.
This sounds interesting, Keep it up guys..............

PS: 89ltr sealed, Thats one I didn't think of.........






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Old 10th March 2005, 07:44 AM   #7
simon5 is offline simon5  Canada
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Do you have the T/S parameters of your PRs?
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Old 10th March 2005, 12:40 PM   #8
DaHos is offline DaHos  United States
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Quote:
Originally posted by simon5
Do you have the T/S parameters of your PRs?
No, I have been unable to define/confirm the following:

Fsp - PR free air resonance frequency =?
Mmp - Mechanical mass of PR diaphragm=265g
Qms - Q of driver at Fsp considering mechanical losses only=?
Sdp - Effective area of PR diaphragm=?
Xpmax - Peak linear PR excursion =?

I checked the D-S-T website with no luck.....


I am still searching and reading all I can to try to get a grasp on all this.

The designs I have seen all seem to use 1 driver or 1 driver with 1 or 2 PR's in a vol of 20-35 ltr.

So I can follow the norm or try to do somthing a little different....with the help from whom ever can help.

I am going to slap together a 28 ltr test box for the 5th sub just to get a feel for whats going on...

I thank you all again... D
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Old 10th March 2005, 06:23 PM   #9
simon5 is offline simon5  Canada
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Found it for you, so it'll be easier for us now...

Peerless XLS 10" Passive Radiator (830481)

Parameter Value
Fs 13.7 Hz
Qms 11.4
Vas 80 l
Rms 2 Kg/s
Mms 265g
Cms 0.508 mm/N
Sd 333 cm2
xmax 22 mm
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Old 10th March 2005, 09:02 PM   #10
simon5 is offline simon5  Canada
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Do you know if you can add mass to the passive radiators? If yes, how much?
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