DIYMobileAudio.com Car Stereo Forum banner
1 - 13 of 13 Posts

· Registered
Joined
·
1,901 Posts
Discussion Starter · #1 ·
Is anyone on here building or 3d printing enclosures for their 2.5 to 3.5" midranges?

I see alot of these small little midranges like the Brax ML3 recommending a little enclosure.. im not sure I really follow... if you have a high pass crossover I thought an enclosure was not necessary.. maybe i am missing something?

Are people making enclosures for their low QTS midrange drivers? Or just a baffle and setting the high pass crossover?

The only midranges I've been able to find with a high QTS are the Audiofrog GB25 and Audible Physics Avatar 3.. Other popular ones like the Scanspeak 10f, Dyn E430, Brax GL3, ML3... they all have a very low QTS...
 

· Registered
Joined
·
2,950 Posts
I remember Andy saying that you should have an enclosure of some sort for the midrange but I would be interested to see what others have to say about this as I am going to start my build soon with the 3.5wm’s

Although these drivers should also work IB…


Sent from my iPhone using Tapatalk
 

· Registered
Joined
·
1,901 Posts
Discussion Starter · #3 ·
I remember Andy saying that you should have an enclosure of some sort for the midrange but I would be interested to see what others have to say about this as I am going to start my build soon with the 3.5wm’s

Although these drivers should also work IB…


Sent from my iPhone using Tapatalk
That's one I was also looking at.. the 3.5wm has a decent QTS 0.58
 

· Registered
Joined
·
1,901 Posts
Discussion Starter · #6 ·
How close are you planning to crossover vs Fs and how well sealed is the baffle/area behind the baffle?

It would be an A pillar so the back of it would be seperated from the front by the pillar... the FS of the ones im looking at are about 100-120hz... i would be crossing at 250hz 24/db at the lowest
 

· Registered
Joined
·
202 Posts
You can model a .707 enclosure vs IB, will most likely show zero difference from ~250hz on up especially bc signal will be 3db down @ crossover freq (if LR xo, so you shouldn't be remotely close to excursion limit etc.).
 

· Registered
Joined
·
1,901 Posts
Discussion Starter · #8 ·
You can model a .707 enclosure vs IB, will most likely show zero difference from ~250hz on up especially bc signal will be 3db down @ crossover freq (if LR xo, so you shouldn't be remotely close to excursion limit etc.).

I just tried it in WinISD.. it made almost no difference until i wanted to go up to 99+ decibels and 250hz.. but if i did 300hz or stayed below 99 decibels it did not reach xmax.. then in a little enclosure it let me go up a few more decibels before reaching xmax... so it looks like it can help but maybe not so critical with a reasonible crossover and volume..
 

· Registered
Joined
·
3,056 Posts
You would want to have an enclosure to control excursion/xmax. With mids playing 300/400Hz and up you dont need an enclosure since you will have hard time to come even close to drivers x-max if mid is capable of 3-5mm xmax. with open back panels (A-pillars/dash top) you will have less coloration, at least with majority of mids, and also there is no benefit pushing small mid too low, all you will get will be higher distortion in lower registers and lower power handling. Decent midbass driver with correct install will outperform small mid big time in the range arround 200-300Hz and bellow.
 

· Banned
Joined
·
811 Posts
Enclosures have two purposes:

1. Isolating the front of the speaker from the back of the speaker to prevent cancellation at low frequencies
2. Modifying the suspension of the speaker to achieve some target Q

The suspension operates mostly below resonance. At resonance, nothing is very good at controlling the motion of the moving mass (that's what resonance is) and above resonance, the motor controls the motion.

So, the box affects the speaker around resonance, but that resonance is Fc rather than Fs. There is no Fs for a speaker in a box.

So, if you're going to use a high pass filter, you should cross above resonance to minimize distortion. If you're going to follow this basic rule, then the box makes sense ONLY if you need it for purpose #1 above. If you don't need it for that, then it's better NOT to have an enclosure, because Fs is always lower than Fc.
 

· Registered
Joined
·
2,950 Posts
Enclosures have two purposes:

1. Isolating the front of the speaker from the back of the speaker to prevent cancellation at low frequencies
2. Modifying the suspension of the speaker to achieve some target Q

The suspension operates mostly below resonance. At resonance, nothing is very good at controlling the motion of the moving mass (that's what resonance is) and above resonance, the motor controls the motion.

So, the box affects the speaker around resonance, but that resonance is Fc rather than Fs. There is no Fs for a speaker in a box.

So, if you're going to use a high pass filter, you should cross above resonance to minimize distortion. If you're going to follow this basic rule, then the box makes sense ONLY if you need it for purpose #1 above. If you don't need it for that, then it's better NOT to have an enclosure, because Fs is always lower than Fc.
So open back of a A Pillar build does sort out your Point #1? Therefore you don’t need an enclosure?

Sometimes we try to build an enclosure but because the driver actually needs a much bigger enclosure than what can be achieved the net result is that your actually limiting the drivers ability to play close to the FS therefore it’s better to build an IB install and make sure it’s sealed from the backwaves ( as per point #1)

Is this this correct?

I am gonna start my build in the next month so this is something I have been thinking about - I think if I model the Focal Utopia 3.5mm the box would end up being unreasonable so IB may be better?


Sent from my iPhone using Tapatalk
 

· Banned
Joined
·
811 Posts
So open back of a A Pillar build does sort out your Point #1? Therefore you don’t need an enclosure?

Sometimes we try to build an enclosure but because the driver actually needs a much bigger enclosure than what can be achieved the net result is that your actually limiting the drivers ability to play close to the FS therefore it’s better to build an IB install and make sure it’s sealed from the backwaves ( as per point #1)

Is this this correct?

I am gonna start my build in the next month so this is something I have been thinking about - I think if I model the Focal Utopia 3.5mm the box would end up being unreasonable so IB may be better?


Sent from my iPhone using Tapatalk
Yes. So long as the baffle is sufficient. Putting a midrange in a box that's way too small is not a great idea because it dramatically raises Fc and also Qtc. If you're going to cross REALLY high, then it doesn't matter. That's rarely the case, though, because people often think the bigger speaker is going to play lower and louder, so they cross LOWER and wind up with a lot of ****ty distortion, no low frequency and a massive peak.
 
1 - 13 of 13 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top