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Multi-Way Conventional loudspeakers with crossovers

2.1 stereo console, need crossover advice
2.1 stereo console, need crossover advice
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Old 13th August 2019, 12:21 PM   #1
nas3000 is offline nas3000  Lithuania
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Default 2.1 stereo console, need crossover advice

Hi!


I am pretty new to designing crossovers, and want to make a stereo console. The idea is to have separate L, R channel speakers for mids and highs and single L+R subwoofer for both channels. Something like 2.1 computer speakers, just in one box and powered by simple stereo (2 channel, no separate subwoofer output) amplifier.


Schematics and view is attached.


Need advice how crossover will differ from 2.0 2way system.

Can I attach woofer like shown or do need something extra?



Willing to read, so if there is a good link about passive 2.1 systems - tanks in advance for sharing.
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File Type: jpg console_face-ld130-la-boite-concept.jpg (49.8 KB, 91 views)
File Type: png stereo_console.png (14.8 KB, 92 views)
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Old 13th August 2019, 03:37 PM   #2
giralfino is offline giralfino  Italy
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Don't take my answer to be definitive, but I think it won't work. The problem is that you want to mix L+R signals at power level into a single driver. The only way to do this should be with a dual voice coil woofer.
Besides that a passive crossover at around 100Hz is simply a non sense, as it will be very expensive and won't work as you expect.
So the best way to do what you want is to put L+R line level output into a plate amp with adjustable digital crossover (in frequency and phase), with a sub powered output that will go straight to the sub and two "satellite" output. If the latter ones are powered they will go to the speakers, if not they will go to a stereo amp. You then need to design the tweeter/mid crossover.

Ralf
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Old 13th August 2019, 05:01 PM   #3
Lojzek is offline Lojzek  Croatia
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A very good advice by Ralf.
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Old 13th August 2019, 07:36 PM   #4
nas3000 is offline nas3000  Lithuania
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Quote:
Originally Posted by giralfino View Post
Don't take my answer to be definitive, but I think it won't work. The problem is that you want to mix L+R signals at power level into a single driver. The only way to do this should be with a dual voice coil woofer.
Besides that a passive crossover at around 100Hz is simply a non sense, as it will be very expensive and won't work as you expect.
So the best way to do what you want is to put L+R line level output into a plate amp with adjustable digital crossover (in frequency and phase), with a sub powered output that will go straight to the sub and two "satellite" output. If the latter ones are powered they will go to the speakers, if not they will go to a stereo amp. You then need to design the tweeter/mid crossover.

Ralf

Ok, I am total noob, so please explain me in steps:


1. Dual voice coil woofer - is this one ok? Dayton Audio RSS265HO-44 10" Reference HO DVC Subwoofer
...its specifications are not bad at all

2. Why passive at 100Hz is nonsense??? If in this link for example this is ok, then it is not that much: 40 USD Parts Express 100 Hz Low Pass 4 Ohm Crossover


3. The whole idea is to avoid plate amps... In the worst scenario I can go with 2 subwoofers, but if they are meant to play in the frequency where direction of the sound is not recognizeable. The idea is to get 1 bigger subwoofer instead 2 a bit smaller ones.
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Old 13th August 2019, 07:42 PM   #5
adason is offline adason  United States
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1. yes, that would work
2. it's not a nonsense, it just needs big coils, but it will work
3. you can't connect one woofer to two amplifiers as your shown, forget that

seems option 1 is best for you, if you do not want plate amp
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Old 13th August 2019, 07:55 PM   #6
nas3000 is offline nas3000  Lithuania
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Quote:
Originally Posted by adason View Post
1. yes, that would work
2. it's not a nonsense, it just needs big coils, but it will work
3. you can't connect one woofer to two amplifiers as your shown, forget that

seems option 1 is best for you, if you do not want plate amp

Thanks for an answer:


No, there is only one amp!

My idea is dead simple - 1 STEREO amp, 2 channels, L and R, no separate sub output. I want to have 2 seaparate mid/high drivers (separate L and R) and just one woofer for L+R signal combined. No plate amps and etc. If there are 2 subwoofers then it is very easy, but how to make it work with 1 sub?


p.s. Seems there is a similar thread crossover for 2.1 setup
Dual voice coil subwoofer looks like the way to go, thanks everyone!

Last edited by nas3000; 13th August 2019 at 08:08 PM. Reason: similar thread found
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Old 14th August 2019, 08:44 AM   #7
nas3000 is offline nas3000  Lithuania
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Quote:
Originally Posted by giralfino View Post
The only way to do this should be with a dual voice coil woofer.

Ralph, sorry, just now saw that you first mentioned DVC woofer. Thank you!
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Old 14th August 2019, 09:59 AM   #8
AllenB is offline AllenB  Australia
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That is a good option. It can also be done passively, if you change your mind.
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Old 14th August 2019, 10:11 AM   #9
Lojzek is offline Lojzek  Croatia
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There is another approach to a solution in building this console. Instead of a 2.1, build a standard 2 way using midwoofer capable of outputting good midbass, namely Peerless by Tymphany SLS 3.5 inch 85s25cp04-04, for instance. Vented alignment might call for a passive radiator in case a vent could not be fitted. A simulation would help a lot.
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Old 14th August 2019, 10:25 AM   #10
nas3000 is offline nas3000  Lithuania
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Quote:
Originally Posted by AllenB View Post
That is a good option. It can also be done passively, if you change your mind.

How it is?

The tas is the same: no plate amps, 2.1 integrated stereo system.
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