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................
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................
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....
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....
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?
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?
"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...
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...
simon5 said:
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
My final idea is to forget the PRs.
Go vented with two 4" diameter pipes 28 inches long.
Put 5 XLS in there, with a full 1600W RMS.
180 liters box, tuned to 18.52 Hz.
127 dB at 20 Hz in room. No vent noise problems, because at 117 dB at 20 Hz in room you're below 5% speed of sound (175W RMS), at 123 dB at 20 Hz in room (700W RMS) you're still below 10% speed of sound. If you go full output at 127 dB (1600W RMS), I guess you can't hear the vent noise even if it's higher than 10%.
I would design it like this :
o...o
v.o.v
o...o
v = port and o = XLS
Nice front panel hehe, a big X of woofers with two vents!
Go vented with two 4" diameter pipes 28 inches long.
Put 5 XLS in there, with a full 1600W RMS.
180 liters box, tuned to 18.52 Hz.
127 dB at 20 Hz in room. No vent noise problems, because at 117 dB at 20 Hz in room you're below 5% speed of sound (175W RMS), at 123 dB at 20 Hz in room (700W RMS) you're still below 10% speed of sound. If you go full output at 127 dB (1600W RMS), I guess you can't hear the vent noise even if it's higher than 10%.
I would design it like this :
o...o
v.o.v
o...o
v = port and o = XLS
Nice front panel hehe, a big X of woofers with two vents!
iz said:
That's about a three times bigger box than recommended by Peerless. Have you modeled that alignment and looked at the FR response curve?
I made a sub using the same driver but with the 400 gram PR. The box is 26 liters after you subtract for speakers, shelf braces, etc. I used 3dB boost at 21Hz on the plate amp. The attached plot shows how it models with the boost included in the calculation. In the room where I use it, it's pretty darned flat to 20Hz.
I am completely satisfied with it.
With the 265 gram PR in the same size box with the same EQ, the modeled response is very flat to about 28 Hz, then falls of precipitously below that. I thought the gentler rolloff with the heavier PR would match up better with room lift. That's why I went with the 400 gram version.
DaHos, If you have an alignment in mind, I could model it.
Attachments
Dave,
Well Im sitting here messing with unibox and I am getting some interesting stuff. The design you have made is similar to what I have in mind but would like to use 2 Drivers per unit. As these will be used as bass units for a 2 way set up. I have to agree that the mid bass (30-150 is flat @ 112 db) I may just have to add a 15" to the mix for HT use. My test cab is 10"x24"x14" so about 50 ltr. max.
Gonna keep at it......
Well Im sitting here messing with unibox and I am getting some interesting stuff. The design you have made is similar to what I have in mind but would like to use 2 Drivers per unit. As these will be used as bass units for a 2 way set up. I have to agree that the mid bass (30-150 is flat @ 112 db) I may just have to add a 15" to the mix for HT use. My test cab is 10"x24"x14" so about 50 ltr. max.
Gonna keep at it......
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.