Go Back   Home > Forums > Loudspeakers > Multi-Way

Multi-Way Conventional loudspeakers with crossovers

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 5th February 2013, 12:21 AM   #1
diyAudio Member
 
Join Date: Jan 2013
Default Stacking speakers

This probably a newbie question, but I'm a newbie, so I hope you all are forgiving.

I'm considering building a pair of 2-way kits (SEAS Idunn kits) and combining them with a pair of SB or Scanspeak 12" subwoofers (also kits).

Would there be any prob using the subs as stands for the Idunns (with an additional supporting post, about 6" high, to bring the Idunns to ear level)?

I'm worrying about transmitting vibration form the subs to the Idunns. But most 3-way systems use drivers which are all bolted to the same baffle, so I wondering whether this worry is idle.

Any advice?
  Reply With Quote
Old 5th February 2013, 01:13 AM   #2
diyAudio Member
 
Join Date: Sep 2012
Location: Maine, Bangor-area
The question is whether or not the two systems can be practically integrated, in terms of frequency range and sensitivity. Most likely the low-frequency cut-off the two-way or f3 is compatible with the upper frequency limit of the sub-woofer, but that might be a problem. Is the sub-woofer a passive speaker system only, or is a dedicated amplifier included?

If you are willing to work with separate power amplifiers for the two-way and sub-woofer, that would make integrating them easier. On the downside, then, however, you are dealing with more equipment than if the same amplifier drives the two-way and sub-woofer.

If you use the same (power) amplifier to drive both sub-woofer and two-way (per stereo channel), then relative sensitivity is a big question. Usually a sub- woofer will have much less sensitivity than a two-way. As the idea is to have flat frequency response, that presents a problem.

I don't think that vibration from the sub-woofer to the two-way would present a problem, but I could be wrong, not having much experience in that area. If that is a problem, I'm sure that there is some way that you could isolate the vibration while still using the sub-woofer as a stand.

-My two cents. I'm sure that many others with more experience will chime in about your query.

Regards,
Pete
  Reply With Quote
Old 5th February 2013, 01:32 AM   #3
diyAudio Member
 
Join Date: Jan 2009
Default Pole mounting

Quote:
Originally Posted by GaryM44 View Post
This probably a newbie question, but I'm a newbie, so I hope you all are forgiving. I'm considering building a pair of 2-way kits (SEAS Idunn kits) and combining them with a pair of SB or Scanspeak 12" subwoofers (also kits).Would there be any prob using the subs as stands for the Idunns (with an additional supporting post, about 6" high, to bring the Idunns to ear level)?

I'm worrying about transmitting vibration form the subs to the Idunns. But most 3-way systems use drivers which are all bolted to the same baffle, so I wondering whether this worry is idle.Any advice?
Hi there: G: Go to search and look-up "The Blackmores", post #26, to see multiple drivers (including a 12") on a frame. I've run a bare TB Full Range, pole attached to an OB bass section with out problems. Try out your concept, should work. ...regards, Michael.
  Reply With Quote
Old 5th February 2013, 02:21 AM   #4
diyAudio Member
 
Join Date: Jan 2013
Thanks, guys.

cT --

Yes, the subs are powered. Each has a 300W plate amp. The sub amps have a pass-through, so I plan to run the pre-outs to them, then back to the Emotiva XPA-2 amp from the pass-throughs to power the Idunns. The plate amps have variable xovers.

The Madisound Speaker Store
  Reply With Quote
Old 5th February 2013, 04:25 AM   #5
diyAudio Member
 
Join Date: Feb 2002
Location: Western Sydney
re: "worrying about transmitting vibration form the subs to the Idunns" - shouldn't be a problem unless you have a party, that's the only time I've caused the mid/tweeter box in my system to move...
__________________
Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency
  Reply With Quote
Old 5th February 2013, 11:54 PM   #6
diyAudio Member
 
Join Date: Sep 2012
Location: Maine, Bangor-area
further on sub-woofer to 2-way vibration transmission

Does anyone understand the mechanics of spikes or spiked feet on floor-standing speakers? The spikes are meant to prevent the vibrating speaker system from vibrating the floor, is that correct? I wonder if spikes on the 2-way supported on the sub-woofer (ouch!) would in a like manner block vibration from the sub-woofer to the 2-way? -Just a thought.
  Reply With Quote
Old 6th February 2013, 12:01 AM   #7
tvrgeek is offline tvrgeek  United States
diyAudio Member
 
Join Date: Dec 2009
Location: Md
There is no better place for subs than as stands for the mains. Some may say you don't get enough "air" around the mains, but I will give that up for the ease of integration and freedom to pick a crossover point much higher.

All the transmission issues are only an issue if you don't know how to build cabinets. You can always put the mains on their own stand, not touching the subs.

Works for Wilson.
  Reply With Quote
Old 6th February 2013, 12:02 AM   #8
diyAudio Member
 
KMossman's Avatar
 
Join Date: Jan 2013
Location: now in Suzhou, China
Send a message via Yahoo to KMossman Send a message via Skype™ to KMossman
Why 2 subs?!
  Reply With Quote
Old 6th February 2013, 12:08 AM   #9
diyAudio Member
 
KMossman's Avatar
 
Join Date: Jan 2013
Location: now in Suzhou, China
Send a message via Yahoo to KMossman Send a message via Skype™ to KMossman
Quote:
Originally Posted by cT equals piD View Post

I don't think that vibration from the sub-woofer to the two-way would present a problem, but I could be wrong, not having much experience in that area.

Mmmmmmmmmmmm

My sister's system - the sub, that is, WILL shake the floor - yes, the floor!


My sub will shake things off my desk!!

So the sub may not affect the other speakers directly but you may have artifacts introduced from the cabinet being banged about.
  Reply With Quote
Old 6th February 2013, 03:50 AM   #10
diyAudio Member
 
Join Date: Jan 2013
Quote:
Originally Posted by KMossman View Post
Why 2 subs?!
Actually, there will be 3.

The 2 new ones will simply serve as woofers for a pair of SEAS Idunns I plan to build. I'll roll them off below 30Hz and try to blend them into the bottom end of the Idunns. They will be used for music.

I already have another sub, which will continue to handle the cannon fire and explosions (LFE stuff) in movies.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Stacking two minidsp's for 2-way plus sub. dabbler miniDSP 3 14th November 2011 07:02 AM
Stacking Cores uzernaam Power Supplies 87 5th January 2011 02:04 AM
Stacking a LOT of 3" speakers? Mikael Abdellah Multi-Way 34 22nd August 2007 07:08 AM
Stacking Opamps?? fmak Digital Source 4 13th August 2004 07:02 AM
Stacking toroids - Ok? harvardian Solid State 23 11th September 2002 05:40 AM


New To Site? Need Help?

All times are GMT. The time now is 05:55 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2