Speakerplans.com Homepage
Forum Home Forum Home > Plans > New Projects Forum
  New Posts New Posts RSS Feed - Dual 12+ HF
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Dual 12+ HF

 Post Reply Post Reply Page  123 5>
Author
Message Reverse Sort Order
smitske96 View Drop Down
Young Croc
Young Croc


Joined: 16 February 2016
Location: The Netherlands
Status: Offline
Points: 701
Post Options Post Options   Thanks (0) Thanks(0)   Quote smitske96 Quote  Post ReplyReply Direct Link To This Post Topic: Dual 12+ HF
    Posted: 12 April 2021 at 10:59am
Quick update:

Getting the tuning frequency a bit higher to around 70-80Hz is very difficult with the current port layout.
So for now I am going back to panels that close fully at the front, and drill or cut the ports in to the panel (like the T24N). 

Also busy with the bracket for the DCX464 and HF950 horn. I can't mount the HF950 just at the front due to the weight. And not only an the entry due to the extra ringing of the horn if its floating free in the air.
Back to Top
smitske96 View Drop Down
Young Croc
Young Croc


Joined: 16 February 2016
Location: The Netherlands
Status: Offline
Points: 701
Post Options Post Options   Thanks (0) Thanks(0)   Quote smitske96 Quote  Post ReplyReply Direct Link To This Post Posted: 22 March 2021 at 8:53pm
Originally posted by bob4 bob4 wrote:

Which 21" driver did you go for in the end? 



I settled on the SAN214.50. The 215.30 was still very hard to get.
Back to Top
bob4 View Drop Down
Old Croc
Old Croc
Avatar

Joined: 29 February 2004
Location: Finland/Germany
Status: Offline
Points: 1603
Post Options Post Options   Thanks (0) Thanks(0)   Quote bob4 Quote  Post ReplyReply Direct Link To This Post Posted: 22 March 2021 at 6:32pm
Which 21" driver did you go for in the end? 


Back to Top
smitske96 View Drop Down
Young Croc
Young Croc


Joined: 16 February 2016
Location: The Netherlands
Status: Offline
Points: 701
Post Options Post Options   Thanks (0) Thanks(0)   Quote smitske96 Quote  Post ReplyReply Direct Link To This Post Posted: 22 March 2021 at 5:42pm
@toastyghost
1m is indeed to short of a distance, last measurements I was bound by the weather conditions. Going for a larger distance would give me problems with other boundaries. In the coming weeks, weather is improving which gives me more freedom. A 244x122cm piece of wood will probably do the job as a reflective underground. For now that with a large grass field is the best I can do. A large concrete surface would be ideal, but not much of those in the neighborhood.

In the above pics, the IR window is set at the default values. So 125ms left and 500 right.


Btw thanks for that PDF, have not read that one yet Smile


Edited by smitske96 - 23 March 2021 at 11:34am
Back to Top
toastyghost View Drop Down
The 10,000 Points Club
The 10,000 Points Club
Avatar

Joined: 09 January 2007
Location: Manchester
Status: Offline
Points: 10160
Post Options Post Options   Thanks (0) Thanks(0)   Quote toastyghost Quote  Post ReplyReply Direct Link To This Post Posted: 22 March 2021 at 3:07pm
Originally posted by smitske96 smitske96 wrote:

New set of measurements done on the 4x10" with the different slots (as seen two posts above).
This time a GP measurement, mic @1m on the ground. Used space was an carport this time, so still some problems with lower frequencies

No EQ:

With EQ (5 PEQ) and off-axis (0/12/24/35 degrees):

With this info, I would chose a 650/700 Hz crossover (depending on the used type) between LF and the HF driver. Also raising the tuning a bit from 65Hz to 80Hz.  




Good start, 1 metre is problematic though. The typically accepted norm for ground plane (or other measurements) is to go ~3x the largest cabinet dimension:
http://excelsior-audio.com/Publications/AES137_PD16_Measuring_Loudspeaker_Systems_rev06a.pdf

Another useful tip is to put the most reflective thing you can between the cabinet exit and the mic. You'll likely find this smooths things out a little.

What windowing is in use, if any?
Back to Top
smitske96 View Drop Down
Young Croc
Young Croc


Joined: 16 February 2016
Location: The Netherlands
Status: Offline
Points: 701
Post Options Post Options   Thanks (0) Thanks(0)   Quote smitske96 Quote  Post ReplyReply Direct Link To This Post Posted: 18 March 2021 at 4:55pm
New set of measurements done on the 4x10" with the different slots (as seen two posts above).
This time a GP measurement, mic @1m on the ground. Used space was an carport this time, so still some problems with lower frequencies

No EQ:

With EQ (5 PEQ) and off-axis (0/12/24/35 degrees):

With this info, I would chose a 650/700 Hz crossover (depending on the used type) between LF and the HF driver. Also raising the tuning a bit from 65Hz to 80Hz.  

Back to Top
smitske96 View Drop Down
Young Croc
Young Croc


Joined: 16 February 2016
Location: The Netherlands
Status: Offline
Points: 701
Post Options Post Options   Thanks (0) Thanks(0)   Quote smitske96 Quote  Post ReplyReply Direct Link To This Post Posted: 12 March 2021 at 3:40pm
Spent 5 min measuring the Cubo sub (no callibration what so ever), rain and wind prevented any further measurements unfortunately:

Response is as expected rising in the upper part of the passband. Needs some out of band EQ to tidy it up. Nonetheless, I like the sound. 
Back to Top
smitske96 View Drop Down
Young Croc
Young Croc


Joined: 16 February 2016
Location: The Netherlands
Status: Offline
Points: 701
Post Options Post Options   Thanks (0) Thanks(0)   Quote smitske96 Quote  Post ReplyReply Direct Link To This Post Posted: 06 March 2021 at 3:28pm
V2 ready for testing:
Back to Top
smitske96 View Drop Down
Young Croc
Young Croc


Joined: 16 February 2016
Location: The Netherlands
Status: Offline
Points: 701
Post Options Post Options   Thanks (0) Thanks(0)   Quote smitske96 Quote  Post ReplyReply Direct Link To This Post Posted: 28 February 2021 at 10:12am
First connector panel done;
Back to Top
smitske96 View Drop Down
Young Croc
Young Croc


Joined: 16 February 2016
Location: The Netherlands
Status: Offline
Points: 701
Post Options Post Options   Thanks (0) Thanks(0)   Quote smitske96 Quote  Post ReplyReply Direct Link To This Post Posted: 19 February 2021 at 12:40pm
With that plate I create a half moon shape slot. With indeed the opening to the back maximizing the hornlength. If I go for a rectangular slot, there is more space left between S2 and S1. Due to the dimensions I cant place the drivers back any further.  The next panel will be fitted in the baffle cutout, and has a recessed ring for the driver to move freely.

As seen in the pic, it also helps with out of band peaks.
The DCX464 should be a nice combo. I already played a bit with the combo by ear, and it can certainly be loud. LOL
Back to Top
Teunos View Drop Down
Old Croc
Old Croc
Avatar

Joined: 23 November 2008
Location: The Netherlands
Status: Offline
Points: 1778
Post Options Post Options   Thanks (0) Thanks(0)   Quote Teunos Quote  Post ReplyReply Direct Link To This Post Posted: 19 February 2021 at 11:44am
Looking nice!
With plates covering the woofers, do you mean that they fire through a slot loaded chamber, creating a acoustical lowpass?
If so; it would likely benefit moving the slots towards the throat a little to maximize loading by the horn as well as provide a smoother horn profile to minimize reflections.
What are your plans for a crossover point? The 800Hz rolloff suggests a capable 1.4" should be ample to not require phase plugs, and the DCX464 should definitely be suited that low, or even lower.


Edited by Teunos - 19 February 2021 at 11:45am
Best regards,
Teun.
Back to Top
smitske96 View Drop Down
Young Croc
Young Croc


Joined: 16 February 2016
Location: The Netherlands
Status: Offline
Points: 701
Post Options Post Options   Thanks (0) Thanks(0)   Quote smitske96 Quote  Post ReplyReply Direct Link To This Post Posted: 18 February 2021 at 3:21pm
Due to the (to) small room, mostly everything under 300Hz is not really usable. So here is the first set of not really usable measurements: LOL


Red is without a plate covering the 10" cones, light blue is half covered, rest is in between.
As expected, it definately helps getting the LF go some higher. I suspect the dip at +-300 Hz to be from the rather large S1. 

Also did some measurements with 6 70mm BR ports (above pic is without). Definately more LF output (by ear) Tuning was measured around 65Hz, but my laptop crashed just after the measurement, so could not save them Angry

Next step:
-Make S1 smaller
-Mount phase plugs (already made)
-Outside measurements


Back to Top
 Post Reply Post Reply Page  123 5>
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 12.03
Copyright ©2001-2019 Web Wiz Ltd.

This page was generated in 0.078 seconds.