Different sized drivers in a sub? - Page 2 - AVS Forum
Forum Jump: 
Reply
 
Thread Tools
post #31 of 44 Old 07-19-2013, 07:23 AM
AVS Special Member
 
steve nn's Avatar
 
Join Date: Aug 2003
Posts: 6,207
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 428
Quote:
Originally Posted by Bill Fitzmaurice View Post

I see nothing to be gained from that. It verges on voodoo engineering.

Ok.. Do you see how there might be any “disadvantage” from doing so (mixing differently tuned subs)

Klipsch RB-75
Klipsch C-7
Klipsch RB-35
On-going SW management class
Denon
PS3
steve nn is offline  
Sponsored Links
Advertisement
 
post #32 of 44 Old 07-19-2013, 07:25 AM
AVS Addicted Member
 
Bill Fitzmaurice's Avatar
 
Join Date: Nov 2009
Location: New Hampshire
Posts: 10,231
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 1688
Quote:
Originally Posted by steve nn View Post

Ok.. Do you see how there might be any “disadvantage” from doing so (mixing differently tuned subs)
Trying to get the different phase and frequency responses to play nice would be a processing nightmare.

Bill Fitzmaurice Loudspeaker Design

The Laws of Physics aren't swayed by opinion.
Bill Fitzmaurice is online now  
post #33 of 44 Old 07-19-2013, 07:36 AM
AVS Special Member
 
oztech's Avatar
 
Join Date: May 2005
Location: Houston Texas
Posts: 7,662
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked: 93
Velodyne tried this some years back and dropped it in favor of their DD18.
oztech is offline  
post #34 of 44 Old 07-19-2013, 07:43 AM
AVS Special Member
 
steve nn's Avatar
 
Join Date: Aug 2003
Posts: 6,207
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 428
Quote:
Originally Posted by Bill Fitzmaurice View Post

Trying to get the different phase and frequency responses to play nice would be a processing nightmare.

Yes that has been my experience. I’m not saying it can’t be done! I still get blasted now and then for stating such though. It would be nice if those who state how wonderful it is, to actually be able to plot it out and see what they’re hearing and at what expense imo.

EDIT> Sorry to the OP for all the questions, but I feel the info contained relates to your original question.

Klipsch RB-75
Klipsch C-7
Klipsch RB-35
On-going SW management class
Denon
PS3
steve nn is offline  
post #35 of 44 Old 07-19-2013, 09:47 AM
AVS Special Member
 
bass addict's Avatar
 
Join Date: Dec 2003
Location: A padded room
Posts: 4,157
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 224 Post(s)
Liked: 327
Quote:
Originally Posted by braveheart123 View Post

You having gazillion drivers doesn't mean they sound as good as they may look.

No, taking your advice that a 10" is a better driver than an 18" would require a gazillion drivers. I only needed 6. rolleyes.gif

Considering I can play near reference, +- 3db's to almost the single digits; I'd say they sound as good as they look. cool.gif

Achievement Unlocked

Psychotic Episode Averted

bass addict is offline  
post #36 of 44 Old 07-19-2013, 10:02 AM
AVS Addicted Member
 
Bill Fitzmaurice's Avatar
 
Join Date: Nov 2009
Location: New Hampshire
Posts: 10,231
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 1688
Quote:
Originally Posted by steve nn View Post

Yes that has been my experience. I’m not saying it can’t be done! I still get blasted now and then for stating such though. .
It makes about as much engineering sense as putting a snow tire on one wheel of your car, a rain tire on another, a summer tire on the third and a racing slick on the fourth. The intent would be to have good performance in all road conditions, the result would be bad performance in any.
bass addict likes this.

Bill Fitzmaurice Loudspeaker Design

The Laws of Physics aren't swayed by opinion.
Bill Fitzmaurice is online now  
post #37 of 44 Old 07-19-2013, 10:23 AM
AVS Special Member
 
steve nn's Avatar
 
Join Date: Aug 2003
Posts: 6,207
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 428
Quote:
Originally Posted by Bill Fitzmaurice View Post

It makes about as much engineering sense as putting a snow tire on one wheel of your car, a rain tire on another, a summer tire on the third and a racing slick on the fourth. The intent would be to have good performance in all road conditions, the result would be bad performance in any.

LOL.. Oh that's a perfect analogy that I can sink my head in. No beating around the bush! Thank you! Hope you don’t mind, but I’m going to use it in the future. I can quote if called for?

Klipsch RB-75
Klipsch C-7
Klipsch RB-35
On-going SW management class
Denon
PS3
steve nn is offline  
post #38 of 44 Old 07-19-2013, 10:40 AM
AVS Addicted Member
 
Bill Fitzmaurice's Avatar
 
Join Date: Nov 2009
Location: New Hampshire
Posts: 10,231
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 1688
Quote:
Originally Posted by steve nn View Post

LOL.. Oh that's a perfect analogy that I can sink my head in. No beating around the bush! Thank you! Hope you don’t mind, but I’m going to use it in the future. I can quote if called for?
Quote away.

Bill Fitzmaurice Loudspeaker Design

The Laws of Physics aren't swayed by opinion.
Bill Fitzmaurice is online now  
post #39 of 44 Old 07-19-2013, 11:42 AM - Thread Starter
Member
 
tknx's Avatar
 
Join Date: Dec 2009
Posts: 42
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
Liked: 11
That is what I figured... Well, back to trying to decide how to maximize WAF, accuracy, and depth.

Denon 4520ci | Salk Veracity ST | OSD WPA-650 | Roku 3 | U-turn Orbit turntable | Roomie Remote | Heir Audio 4.A CIEM
tknx is offline  
post #40 of 44 Old 07-19-2013, 11:51 AM
AVS Special Member
 
steve nn's Avatar
 
Join Date: Aug 2003
Posts: 6,207
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 428
Quote:
Originally Posted by tknx View Post

That is what I figured... Well, back to trying to decide how to maximize WAF, accuracy, and depth.

Yeah the problem is they don’t always coincide. mad.gifsmile.gif

Klipsch RB-75
Klipsch C-7
Klipsch RB-35
On-going SW management class
Denon
PS3
steve nn is offline  
post #41 of 44 Old 07-19-2013, 02:14 PM
AVS Special Member
 
braveheart123's Avatar
 
Join Date: Jul 2011
Location: Lone Wolf McQuade from Islamabad Pakistan
Posts: 1,832
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 11 Post(s)
Liked: 116
Quote:
It makes about as much engineering sense as putting a snow tire on one wheel of your car, a rain tire on another, a summer tire on the third and a racing slick on the fourth. The intent would be to have good performance in all road conditions, the result would be bad performance in any.

Utterly inappropriate example strictly speaking in the context of two sub boxes both serving different pass bands and used within the same room. I did it a couple of years ago. One box (10" driver) was playing frequencies from 80Hz to 50Hz and another (12" Driver) playing 50Hz and below. I did that coz the right side of my room was offering great depth but very ruffled up upper bass; while the left side offered completely opposite. Hence the need for two separate boxes serving different pass bands.

Somewhat the same thing is very much possible within one enclosure housing two different size drivers in their own completely isolated enclosures within the same box. One can use an iNuke DSP amp for splitting the bands at DSP level and employ two channels of iNuke to serve separate compartments within the same box. One can be assigned to play upper bass while the other can handle the ULF.

Not a big deal.

History is written by those who have hanged heroes ...

The best EQ is no EQ ...

Alpine SWR-1223D Slot Ported HT Sub

Dual Dayton RSS390HO-4 Reference 15 Build For HT

Main System: Klipsch RF-82 II, Klipsch RC-62 II, RS-52 II, Onkyo 5010, Rythmik FV15HP, PSB S300
braveheart123 is online now  
post #42 of 44 Old 07-19-2013, 02:30 PM
AVS Special Member
 
oztech's Avatar
 
Join Date: May 2005
Location: Houston Texas
Posts: 7,662
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked: 93
IMO the dips and peaks are room related so having two drivers in the same box does not address either but will add to db output hence the reason some rooms require two subs in different locations as some are finding out XT-32 is not a cure all.
oztech is offline  
post #43 of 44 Old 07-19-2013, 03:55 PM
AVS Special Member
 
steve nn's Avatar
 
Join Date: Aug 2003
Posts: 6,207
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 428
Quote:
Utterly inappropriate example strictly speaking in the context of two sub boxes both serving different pass bands and used within the same room.

I don’t get it! That’s not what he was addressing.. he was commenting on four differently tuned subs.. say like two 18Hz tuned subs playing along with two 25Hz tuned subs... Not splitting the bands/spectrum between the two.

Klipsch RB-75
Klipsch C-7
Klipsch RB-35
On-going SW management class
Denon
PS3
steve nn is offline  
post #44 of 44 Old 07-19-2013, 04:39 PM
AVS Special Member
 
braveheart123's Avatar
 
Join Date: Jul 2011
Location: Lone Wolf McQuade from Islamabad Pakistan
Posts: 1,832
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 11 Post(s)
Liked: 116
Quote:
I know too little about sound design to answer this, but is there a reason sub designers don't use different sized woofers that roll-off to each other to keep things tight and optimized across the bass spectrum? Is it just too difficult to cross-over without significant artifacts? Seems like you would get tight upper bass with an 8-10" and get the deeper stuff with a 15" or something like that.

I was responding to the starting comments from the OP, so, it is very much doable if he wishes so. I just gave a re-engineered approach to the OP to address his concern.
No more from my side in this thread.

History is written by those who have hanged heroes ...

The best EQ is no EQ ...

Alpine SWR-1223D Slot Ported HT Sub

Dual Dayton RSS390HO-4 Reference 15 Build For HT

Main System: Klipsch RF-82 II, Klipsch RC-62 II, RS-52 II, Onkyo 5010, Rythmik FV15HP, PSB S300
braveheart123 is online now  
Reply Subwoofers, Bass, and Transducers

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page


Forum Jump: 

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off