Open source speaker project?

[Aatto]

It might be helpful to add some words describing each one instead of just the numbers, like:


Option 01: >90db - >60 Liter Classic Design F3 of 35-40HZ (loud, large, low)
Option 02: >90db - <60 Liter Classic Design F3 of 40-45HZ (loud, smaller, not as low)
Option 03: <90db - >60 Liter Classic Design F3 of 30-35HZ. (not as loud, large, very low)
Option 04: <90db - <60 Liter Classic Design F3 of 35-40HZ. (not as loud, smaller, low)


For me as a newbie who is interested in building these speakers some day, that helps me understand the essential trade-offs in the engineering, that I can't have small, loud, and very low all at the same time.


-Neil N0FN

thanks for your input, this is exactly what we need

 

[Aatto]

I m a bit frustrated, we are going backwards.
what drneilmb said is right, we may need to go with what mbrennwa suggested first.

(1) Should the speaker design focus on "amplifier friendliness + WAF (sacrificing deep bass)" vs "amp friendliness + deep bass (sacrificing WAF)" vs "WAF + deep bass (sacrificing amp friendliness)"?
(2) What is the largest acceptable size of the speaker (provide choice of different volumes)?
(3) Do you prefer the tower or "monkey box"/monitor format?
(4) What is the max. allowed parts cost?
etc.

 

[Aatto]

How about this ?

1-Classic - Amp Friendly - High Sensitivity (92db+), Higher Bass Extension (f3 of 40-45Hz), Cabinet Size of 60-80 Liter - Classic Design.
2-Classic - Bass Friendly - Deep Bass Extension (f3 of 35-40Hz), Lower Sensitivity (~88-90db) , Cabinet Size of 80-110 Liter - Classic Design.
3-Classic XL- Amp and Bass Friendly High Sensitivity (92db+), Deep Bass Extension (f3 of 35-40Hz), Cabinet size of 100-150 - Classic Design.
4-Tower - Amp Friendly - High Sensitivity (92db+), Higher Bass Extension (f3 of 40-45Hz), Cabinet Size of 60-80 Liter - Tower(Floor Standing) Design.
5-Tower - Bass Friendly - Deep Bass Extension (f3 of 35-40Hz), Lower Sensitivity (~88-90db) , Cabinet Size of 80-110 Liter - Tower(Floor Standing) Design.
6-Tower XL- Amp and Bass Friendly High Sensitivity (92db+), Deep Bass Extension (f3 of 35-40Hz), Cabinet size of 100-150 - Tower(Floor Standing) Design.

This may not have all the details we need, but it is much easier for voters, and will give us a pretty narrow range, and the design team can dictate the driver size, needed volume... based on the poll.
Please leave your feedback so we can get this off the way and keep it rolling

 

[montana1]

Aatto,
I like it! There should be enough information there to commence with the voting process.

Best,
Rich

 

[Aatto]

Thanks
and I forgot to mention that since the poll is pretty close between 500 & 500$+, the 1000$ max is for a pair(been discussed?), excluding XO parts and cabinet of course.

 

[KaffiMann]

Ok, thanks for clearing that up. (Budget)

That list of options in your post #543 is spot on Aatto! Fire away!

 

[drneilmb]

1-Classic - Amp Friendly - High Sensitivity (92db+), Higher Bass Extension (f3 of 40-45Hz), Cabinet Size of 60-80 Liter - Classic Design.
2-Classic - Bass Friendly - Deep Bass Extension (f3 of 35-40Hz), Lower Sensitivity (~88-90db) , Cabinet Size of 80-110 Liter - Classic Design.
3-Classic XL- Amp and Bass Friendly High Sensitivity (92db+), Deep Bass Extension (f3 of 35-40Hz), Cabinet size of 100-150 - Classic Design.
4-Tower - Amp Friendly - High Sensitivity (92db+), Higher Bass Extension (f3 of 40-45Hz), Cabinet Size of 60-80 Liter - Tower(Floor Standing) Design.
5-Tower - Bass Friendly - Deep Bass Extension (f3 of 35-40Hz), Lower Sensitivity (~88-90db) , Cabinet Size of 80-110 Liter - Tower(Floor Standing) Design.
6-Tower XL- Amp and Bass Friendly High Sensitivity (92db+), Deep Bass Extension (f3 of 35-40Hz), Cabinet size of 100-150 - Tower(Floor Standing) Design.

Those are amazing choices. I feel like they do a great job of expressing the trade-offs and if there is a clear top choice, then that will give the designers lots to work with.

 

[Paul Vancluysen]

1-Classic - Amp Friendly - High Sensitivity (92db+), Higher Bass Extension (f3 of 40-45Hz), Cabinet Size of 60-80 Liter - Classic Design.
2-Classic - Bass Friendly - Deep Bass Extension (f3 of 35-40Hz), Lower Sensitivity (~88-90db) , Cabinet Size of 80-110 Liter - Classic Design.
3-Classic XL- Amp and Bass Friendly High Sensitivity (92db+), Deep Bass Extension (f3 of 35-40Hz), Cabinet size of 100-150 - Classic Design.
4-Tower - Amp Friendly - High Sensitivity (92db+), Higher Bass Extension (f3 of 40-45Hz), Cabinet Size of 60-80 Liter - Tower(Floor Standing) Design.
5-Tower - Bass Friendly - Deep Bass Extension (f3 of 35-40Hz), Lower Sensitivity (~88-90db) , Cabinet Size of 80-110 Liter - Tower(Floor Standing) Design.
6-Tower XL- Amp and Bass Friendly High Sensitivity (92db+), Deep Bass Extension (f3 of 35-40Hz), Cabinet size of 100-150 - Tower(Floor Standing) Design.

Also ok for me.

 

[Drummer2005]

I think those are great choices, and several that I could live with as my own speaker. Glenn.

 

[NickOne]

1-Classic - Amp Friendly - High Sensitivity (92db+), Higher Bass Extension (f3 of 40-45Hz), Cabinet Size of 60-80 Liter - Classic Design.
2-Classic - Bass Friendly - Deep Bass Extension (f3 of 35-40Hz), Lower Sensitivity (~88-90db) , Cabinet Size of 80-110 Liter - Classic Design.
3-Classic XL- Amp and Bass Friendly High Sensitivity (92db+), Deep Bass Extension (f3 of 35-40Hz), Cabinet size of 100-150 - Classic Design.
4-Tower - Amp Friendly - High Sensitivity (92db+), Higher Bass Extension (f3 of 40-45Hz), Cabinet Size of 60-80 Liter - Tower(Floor Standing) Design.
5-Tower - Bass Friendly - Deep Bass Extension (f3 of 35-40Hz), Lower Sensitivity (~88-90db) , Cabinet Size of 80-110 Liter - Tower(Floor Standing) Design.
6-Tower XL- Amp and Bass Friendly High Sensitivity (92db+), Deep Bass Extension (f3 of 35-40Hz), Cabinet size of 100-150 - Tower(Floor Standing) Design.

Let's go polling

 

[mbrennwa]

1-Classic - Amp Friendly - High Sensitivity (92db+), Higher Bass Extension (f3 of 40-45Hz), Cabinet Size of 60-80 Liter - Classic Design.
2-Classic - Bass Friendly - Deep Bass Extension (f3 of 35-40Hz), Lower Sensitivity (~88-90db) , Cabinet Size of 80-110 Liter - Classic Design.
3-Classic XL- Amp and Bass Friendly High Sensitivity (92db+), Deep Bass Extension (f3 of 35-40Hz), Cabinet size of 100-150 - Classic Design.
4-Tower - Amp Friendly - High Sensitivity (92db+), Higher Bass Extension (f3 of 40-45Hz), Cabinet Size of 60-80 Liter - Tower(Floor Standing) Design.
5-Tower - Bass Friendly - Deep Bass Extension (f3 of 35-40Hz), Lower Sensitivity (~88-90db) , Cabinet Size of 80-110 Liter - Tower(Floor Standing) Design.
6-Tower XL- Amp and Bass Friendly High Sensitivity (92db+), Deep Bass Extension (f3 of 35-40Hz), Cabinet size of 100-150 - Tower(Floor Standing) Design.

This may not have all the details we need, but it is much easier for voters, and will give us a pretty narrow range, and the design team can dictate the driver size, needed volume... based on the poll.
Please leave your feedback so we can get this off the way and keep it rolling

Fine with me! Go for it!

Just to be clear about the sensitivity numbers: are these free-field (worst-case) values? I guess you took those numbers from the attachment in post 500. Taking into account the help of the walls and floor, the in-room SPL will be a bit higher than these numbers. This means we could get away with a smaller box at the given cut-off frequencies (80 L is still damn big according to my SWMBO).

 

[Paul Vancluysen]

Just to be clear about the sensitivity numbers: are these free-field (worst-case) values? I guess you took those numbers from the attachment in post 500. Taking into account the help of the walls and floor, the in-room SPL will be a bit higher than these numbers. This means we could get away with a smaller box at the given cut-off frequencies (80 L is still damn big according to my SWMBO).

IMO it is best to specify the sensitivity in full space (2.83Vrm, 1m) and take that as the reference. Behaviour in other domains like half and quarter space can all be simulated out of the full space sensitivity. Otherwise it will give confusion.
Remark that the full space sensitivity of the attachement in post 500 is calculated for a driver DC resistance value of 6 Ohm, typical value for a 8 Ohm driver.

 

[Aatto]

alright cool I ll let the Moderators know to edit the poll and I will edit the first post accordingly .
the numbers are not fixed and still flexible as design team needed, if we can pull a "bass friendly" unit in 60 liter why go bigger ? I never built or thought of an 80 liter cabinet either haha.

...
Just to be clear about the sensitivity numbers: are these free-field (worst-case) values? I guess you took those numbers from the attachment in post 500...

yes I got it from suggested numbers

EDIT: Can one of the moderators edit and reset the poll according to post #543 please

 

[jazbo8]

Unfortunately, it appears that the forum software does not allow those voted earlier, to vote again in the revised poll, therefore this poll/thread will be closed, and Aatto will start a new poll to keep the discussion going, see Open source speaker project - Part II for more information.