Dual Opposed Subwoofer project (2x RSS210HO8)

[diyhobby]

Ppataki Hi

How do you rate this Dayton DOS vs 8" DOS with LaVoce. pros and cons.

regards
anand

 

[ppataki]

Ppataki Hi

How do you rate this Dayton DOS vs 8" DOS with LaVoce. pros and cons.

regards
anand

They are totally different, for different use-cases
The Daytons are suitable for high SPL - great for movies
The LaVoce are budget PA speakers, they are great for music but not really suitable if you need high SPL below 40Hz. Even for music I would use at least 4 of them

 

[Kalasbarnet]

hello and congrats on the build, looks really good!

I am interested in your design philosophy with regards to room gain!

you stated something like"room gain is +15db at 24hz, so the -15db point is 0db in reality"

does this mean that you factor in the room gain already during design stage and designed it to roll off so that the -15db point was exactly at the same freq that the room gain increases by 15db???

This sounds super smart and i have not read about this approach before (but i am a noob).

Can you please expand on this and correct me if my assumption is wrong? would like to learn since i am planning on building something similar (but with reckhorn d250 or d200 drivers) and when simulating it is really difficult to get a f3 below 30hz

 

[ppataki]

hello and congrats on the build, looks really good!

I am interested in your design philosophy with regards to room gain!

you stated something like"room gain is +15db at 24hz, so the -15db point is 0db in reality"

does this mean that you factor in the room gain already during design stage and designed it to roll off so that the -15db point was exactly at the same freq that the room gain increases by 15db???

This sounds super smart and i have not read about this approach before (but i am a noob).

Can you please expand on this and correct me if my assumption is wrong? would like to learn since i am planning on building something similar (but with reckhorn d250 or d200 drivers) and when simulating it is really difficult to get a f3 below 30hz

Yes, that is correct!

Whenever I design speakers into a specific room, I measure the room first: I place the mic in the planned listening position, place some existing speakers (that go reasonably low) in the planned speakers position (can be/shall be multiple) and use them to measure the room response

Then I can tell how the new, to-be-built speaker will behave in that particular room, in those positions

This way I can tell that in my living room there is a huge +15dB peak at 24Hz - this basically means that I can place almost whatever speaker there, they will go down to 24Hz

We used the same approach in a different room in this project: https://www.audiosciencereview.com/forum/index.php?threads/diy-2-2-living-room-project.57939/

 

[Kalasbarnet]

wow thanks for the quick reply and detailed description of your approach, as i noted earlier that's really super smart and i guess one of the perks of diy when you can tailor it to your room in such a way! i must measure my rooms now before i make any fruther decisions on builds haha

 

[diyhobby]

They are totally different, for different use-cases
The Daytons are suitable for high SPL - great for movies
The LaVoce are budget PA speakers, they are great for music but not really suitable if you need high SPL below 40Hz. Even for music I would use at least 4 of them

Oh ok Now understand. Once last question my dealer has Peerless 830452 10" XLS drivers in stock at a decent price. Dayton is higher priced for me and its 8" where as peerless is 10" can you suggest if this peerless simulates well. whast your view

regards
anand

​

 

[ppataki]

Oh ok Now understand. Once last question my dealer has Peerless 830452 10" XLS drivers in stock at a decent price. Dayton is higher priced for me and its 8" where as peerless is 10" can you suggest if this peerless simulates well. whast your view

regards
anand

​

If you plan to put them in a sealed box you can use a 15 liter cabinet
The xmax limited max power will be 500W and that will provide you with 99.5dB at 1 meter at 25Hz

 

[Kalasbarnet]

Oh ok Now understand. Once last question my dealer has Peerless 830452 10" XLS drivers in stock at a decent price. Dayton is higher priced for me and its 8" where as peerless is 10" can you suggest if this peerless simulates well. whast your view

regards
anand

​

what dealer is this if i might ask haha? 30 liters for a dual opposed sub sounds fantastic, i would go for 4 of these (8 drivers total) then integrated into a 4 way floor standing stereo pair (living room situation, multiple spread out subs is a no go from mrs)

 

[diyhobby]

If you plan to put them in a sealed box you can use a 15 liter cabinet
The xmax limited max power will be 500W and that will provide you with 99.5dB at 1 meter at 25Hz

View attachment 510625

View attachment 510626

15 litre for dual opposed ?

 

[ppataki]

15 litre for dual opposed ?

15 liter each
So 30 liter for a DOS config
And in that case you will need 1000W to take them to xmax (at 20Hz)

And that will give you 103dB SPL at 1 meter

Cabinet details: