DIY PA Speakers Setup (Line Array)

[apexaudio]

Dear sir Apex,
I am using your design with 12 inch drivers.Response is very good with 3- way active crossover system.It is driven by your 'quasi amp for beginners' amplifier. I want to know that does it need any subwoofer filter circuit or fine with 3 way active crossover ? Also please suggest me anything suitable to cover front opening of this box.
thanks
sudhir.

Nice work, you need active crossover with high cut at 150Hz 24dB/oct and low cut at 40Hz for best response.
Regards

 

[sudhir kumar]

subwwofer

Nice work, you need active crossover with high cut at 150Hz 24dB/oct and low cut at 40Hz for best response.
Regards[/QUOTE]
Thanks for reply .Does your suggested circuit for subwoofer controller in mic,line eq. thread is suitable for this.
thanks.
sudhir.

 

[apexaudio]

Nice work, you need active crossover with high cut at 150Hz 24dB/oct and low cut at 40Hz for best response.
Regards

Thanks for reply .Does your suggested circuit for subwoofer controller in mic,line eq. thread is suitable for this.
thanks.
sudhir.[/QUOTE]

Yes, it have adjustable x-over frequency and is suitable for any subwoofer.

 

[apexaudio]

MB15

 

[apexaudio]

HF Protect with 2N3055

 

[rvrazvan]

Since the rear of the driver is much closer to the mouth of the
horn, at very low frequencies it is effectively de-coupled from the
system and its radiation does not affect the total output. As
frequency increases the situation changes and the rear of the
driver begins to be coupled to the horn.
When the frequency is such that the horn is one-half wavelength
long the rear of the driver is fully coupled to the horn. The pressure
from the front and rear of the driver are of reverse polarity; a 180°
phase shift at all frequencies. The pressure from the front of the
driver (at the throat) and the pressure from the rear of the driver
(close to the mouth) are now approximately one-half wavelength
apart. This represents a phase shift of 180°. At this frequency
both the front and rear of the driver are driving the horn in phase.
When this happens the driver’s radiating surface area (Sd), as far
is the horn is concerned, had significantly increased (almost
doubled). Since the driver radiates from the front and back of the
diaphragm, this yields very different driver parameters than when
at the one-quarter wavelength resonance condition.

In real world applications where the measured SPL is comparable
for a conventional vented horn and a tapped horn design, the
diaphragm excursion of the driver is greatly reduced due to the
acoustical loading of the horn. This decrease in excursion will
translate directly into lower distortion and far higher output
capability

Suranjan

I remember palying in horn response with a weird tapped horn that looked like this and the response was very good. Never build it

 

[apexaudio]

2181

 

[apexaudio]

Ported horn idea

 

[apexaudio]

Another horn idea...

 

[apexaudio]

Compact array
http://bmsspeakers.com/fileadmin/bms-data/downloads/bms_catalogue_2012-03-14_72dpi.pdf

 

[apexaudio]

Symmetrical Scoop idea

 

[apexaudio]

Advantage of folded horn is that the floor extended horn length.

 

[apexaudio]

Another version of symmetrical scoop.

 

[wattaniya]

hi apex sir,
this is ur 18inch sub design. 500w each.
is it need crossover for this sub, pls give a crossover sch.

 

[apexaudio]

hi apex sir,
this is ur 18inch sub design. 500w each.
is it need crossover for this sub, pls give a crossover sch.

Nice work, use x-over from posts #1o2 and #104 in thread:
http://www.diyaudio.com/forums/analog-line-level/167363-mic-line-eq-preamps-11.html
Regards

 

[wattaniya]

Nice work, use x-over from posts #1o2 and #104 in thread:
http://www.diyaudio.com/forums/analog-line-level/167363-mic-line-eq-preamps-11.html
Regards

thank u apex sir for the reply

 

[apexaudio]

Folded Horn idea for 15inch driver

 

[wattaniya]

hi apex sir,
i found one problem with 18 inch sub,
the sound is good without the plastic bottom corners(dirrectly keep the box in the floor),but when i fix the plastic four corners to the box and checked the sound , the sound is not hard, any solution?

 

[apexaudio]

hi apex sir,
i found one problem with 18 inch sub,
the sound is good without the plastic bottom corners(dirrectly keep the box in the floor),but when i fix the plastic four corners to the box and checked the sound , the sound is not hard, any solution?

There can't be any audable difference with plastic corners, check phase of drivers.

 

[wattaniya]

the drivers are same phase and the distance also same.
if i keep one feet distance from the floor the hardness is not good,but if i keep in the floor very good .
what will be the problem?