Help me design this midrange only speaker

Status
Not open for further replies.
Jump to Latest
#41
Moondog55 said:
I've had [ and blown up] a couple of pairs of Auratone 5Cs.
As something to replicate the sound you could get from a portable transistor radio they were pretty good.
But the old standby and my favourite easy to use midrange is the Vifa P-13 and in a small stuffed cube would equal and better the Aurotone
Click to expand...


Is this driver still in production? I am having troubles finding it.....




On another Note, I found a very very promising driver:
https://www.falconacoustics.co.uk/downloads/Seas/h1152_datasheet.pdf
The SEAS CA12RCY H1125-08 (what a simple name...)


Looks like it almost replicates the auratone frequency response in a 2.5l closed box and it has a moderately low Qts.


Any oppinion/experience on this one?
 
Last edited:
#42
I calculated some volumes for final Qs in the following calculator for the above driver for a closed box: Speaker Box Enclosure Designer / Calculator

Total System Q 0.45 needs 4.5 liters
Total System Q 0.5 needs 3.12 liters
Total System Q 0.6 needs 1.82 liters (not gonna happen, just for reference)


Now the question popping up is, how does the listening room affect the system Q? Is it lowering it or increasing the System Q? In other words, if I aim for a real system Q (speaker, box and room) of 0.5, shall I overshoot a bit or shall I design for a lower Q?
 
Last edited:
#44
Datsun said:
Scan-Speak 15M/4531K00
Seas MCA15RCY (H1262)

Both have a very flat range of 100 Hz in a volume of 2-3 liters.
Click to expand...


Yes, I was looking at the Scan-Speak drivers, but was a bit concerned about the boost between 2khz and 8khz. This could sound a bit too stressfull over extended periods of time. I actually do not know if this actually reflects the real life experience with those drivers.... But the driver is a bit expensive.


I was looking at the Seas as well, but it looked to me like it has almost a bit too much of the highend, for a mid range only speaker.
 
#46
Schlumpfpeter said:
Yes, I was looking at the Scan-Speak drivers, but was a bit concerned about the boost between 2khz and 8khz. This could sound a bit too stressfull over extended periods of time. I actually do not know if this actually reflects the real life experience with those drivers.... But the driver is a bit expensive.
I was looking at the Seas as well, but it looked to me like it has almost a bit too much of the highend, for a mid range only speaker.
Click to expand...


I put both of these drivers in 3-way speakers, excellent in the middle.

The rise of the SS will be removed with a box and a filler, and the high frequencies of the Seas (it plays up to 9 kHz) will not be cut off for long.
 
#47
Datsun said:
Room separately, Qtc - separately, they are not connected.
Just when we calculate the volume, we always achieve Qtc = 0.707 - with such an indicator the most even pressure at low frequencies.
Click to expand...
I know that they are not connected, but they both influence the final q of the whole system. The room is part of it, question is, does it increase or lower the final q of the whole combined system?
 
#49
Sorry, I think it is funny to theoretisize frontside air pressure effect on Q measurement, when designing a deliberately bad loudspeaker.

So far no-one has mentioned baffle diffractions, in-box standing waves or desktop/boundary reflections, which have at least 100 times more effect on response and sound.
 
Last edited:
#50
Juhazi said:
Sorry, I think it is funny to theoretisize frontside air pressure effect on Q measurement, when designing a deliberately bad loudspeaker.

So far no-one has mentioned baffle diffractions, in-box standing waves or desktop/boundary reflections, which have at least 100 times more effect on response and sound.
Click to expand...


Yes, good points. Baffle will be modelled when I put it into a software. Standing waves cannot really be avoided but will be reduced with damping and with the right cabinet meassurements. Desktop reflections won't be there.


Please don't mistake this project for a normal loudspeaker project, and call it "deliberatly bad". This speaker is not meant to be a normal loudspeaker for normal use, therefore judging it by the same standards as a "normal" speaker does not really give it it's credit.
 
Last edited:
#51
ILikeFoodz said:
I'm theorizing here, but I suspect it will not impact the overall Q. I say this because it should be possible to model as just an infinitely large sealed box on the front side of the driver.
Click to expand...


This might be true, but maybe not... I read in several sources that speaker placement in teh room affects the Q of the whole speaker. I just never found a real explanation or any cooment whether it increases or decreases the Q.
 
#52
Placement in room will affect the sound certainly. Nearness to walls will affect the baffle step. Objects in the room will cause diffraction and reflections. There are any number of other room placement parameters that will affect the sound. Q is mostly based on pressure and volume though to the best of my knowledge, and since the room is very large relative to the speaker box usually, modelling as an infinite volume should be very close to accurate for your application, which doesn't involve PA level volumes from what I understand 🙂
 
Status
Not open for further replies.
Top Bottom