High Efficiency Speaker Asylum

Need speakers that can rock with just one watt? You found da place.

Return to High Efficiency Speaker Asylum


Message Sort: Post Order or Asylum Reverse Threaded

Which 2" horn for Pyle PDB 752 to get the best of the mid lows ?

85.19.92.6

Posted on July 14, 2014 at 22:54:30
beppe61
Audiophile

Posts: 4705
Joined: January 29, 2004
Hi ! i have just received my first pair of compression drivers ever !!!
It has a 2" exit throat, differently from what reported in some web pages (they mention only 1.4" exit).
This is very good for me.
I was quite excited ... but of course the cheapness shows ... nothing strange about this. I have paid them new for almost nothing.
Anyway ... curious to see the 75 mm dome i removed the back cover and the diaphragm is glued to the plastic cover !!!!!
This i do not like at all really ... and i wonder why they have decided for this construction

By the way ... i bought this pair after seeing a spectacularly extended freq response in the datasheet down to 500 Hz !!!!
Unfortunately I have been not able to understand which horn they have used ... another situation that i find sincerely confusing ... why they do not mention the horn used ???

Then my question ... to be able to use this horn below 1kHz is it true that the horn must be huge ?
Which horn would you use and which low cut frequency would you select ?
I was looking at some 2" throat horns from 18sound or B&C ... but i do not understand how low they could go with this driver.
Once that i will have also the horns i will have to decide for the xover to use ... like active or passive to begin with.

I would like to add that i would need 100 dB max during peaks at 2 meters
My goal is to get very low distortion above everything else
I think it is the very secret for spectacular sound ... to keep distortion as low as possible i mean.

Thanks a lot for any kind suggestion.

Kind regards,
bg

 

Hide full thread outline!
    ...
RE: Which 2" horn for Pyle PDB 752 to get the best of the mid lows ?, posted on July 15, 2014 at 13:08:55
moray james
Manufacturer

Posts: 1599
Location: Calgary on the Bow
Joined: May 19, 2002
if yo want to go low look at the EV DH1A as a minimum (3 inch diaphragm)and the four inch JBL units. what you have is only good to about 1KHz. a 1.4 - 1.5 inch exit will insure the best high end response. yes you will need a two foot to three foot square mouth to do 500 Hz and lower well. Best regards Moray James.
moray james

 

RE: Which 2" horn for Pyle PDB 752 to get the best of the mid lows ?, posted on July 15, 2014 at 23:09:02
beppe61
Audiophile

Posts: 4705
Joined: January 29, 2004

Hi and thanks a lot for the valuable reply
The 4" JBLs like the 375 are my dream ... a friend of mine have them
Unbelievable.
What impressed me is the response curve in the Pyle driver datasheet
Unfortunately the info about the horn used are missing ... how can be that i do not know.
And it goes quite low.
I will not need high level and i could use a eq to level the curve
My goal would be the 7-800 Hz reproduce by the Pyle driver.
The exit throat size is 2" on this driver.
Another weird solution is the diaphragm glued to the plastic cover.
I risked to ruin everything because i wanted to see the dome and everything came up together ... is this not weird ?
The price is also unbelievably low by the way.
It is my first experience with HE driver.
Thanks a lot again.








Kind regards,
bg

 

RE: Which 2" horn for Pyle PDB 752 to get the best of the mid lows ?, posted on July 15, 2014 at 23:20:12
djk
Manufacturer

Posts: 6135
Joined: June 17, 2000
" risked to ruin everything because i wanted to see the dome and everything came up together ... is this not weird ?"

EV DH1A is built the same way.

 

RE: Which 2" horn for Pyle PDB 752 to get the best of the mid lows ?, posted on July 15, 2014 at 23:36:44
moray james
Manufacturer

Posts: 1599
Location: Calgary on the Bow
Joined: May 19, 2002
http://www.audioheritage.org/html/history/jbl-pro/beginnings.htm

newer versions of JBL would be worth your consideration. They have a three inch diaphragm unit with Be diaphragm and a number of the four inch diaphragm units will accept aftermarket Be diaphragms also. As I mentioned the EV DH1A is a fine driver also. remember you get what you pay for and true quality and consistency do not come cheap so if it seems too good to be true than it probably is. the higher you want this driver to play the smaller the exit you want. spend you money of the real deal not knock off off shore stuff. I bought a pair of used DH1A for $260.00 delivered they are in excellent condition and they sound superb. With the extender nose cup removed the DH1A has a 1.4 inch exit otherwise 2" nominal (1.94"). Best regards Moray James.

http://www.audioheritage.org/html/projectmay/technology/435be.htm
http://www.jblpro.com/pages/components/componts.htm
www.electrovoice.com/downloadfile.php?i=971741
moray james

 

RE: Which 2" horn for Pyle PDB 752 to get the best of the mid lows ?, posted on July 16, 2014 at 01:00:41
beppe61
Audiophile

Posts: 4705
Joined: January 29, 2004

Hi and thanks for the info
I wonder if there is a technical reason
I like so much the replacement parts ... i like the domes in general as i like also the sferical woofers/mid
there is something fundamentally right and beautiful in these shapes.
Next time i will check better
Thanks a lot.

Kind regards,
bg

 

Thanks again and clearly i have to study a lot, posted on July 16, 2014 at 01:21:07
beppe61
Audiophile

Posts: 4705
Joined: January 29, 2004

Hi again and thank you very much indeed for the valuable advice
I will be "playing" with cheap things for a while to understand a little
Then i will go and hunt for something serious
The big JBL are amazing.

Speaking of 4" diaphragms i read a very interesting article on a pubblic demo of the Everest speakers by JBL
They have a 4" mid if i remember right.
At a certain point they put a blanket covering the tweeter
What was left was felt quite complete by the listeners
I am approching the mid 50 and my ears are now limited to 14-15 kHz ?
If i can get 50-15kHz i am happy ... but i would like to get them with very low distortion.
I am looking for the least distortion and possibly nice efficiency.
To end i am not ready for the serious stuff. I am still playing.
Thanks a lot again.
Kind regards,
bg

 

RE: Which 2" horn for Pyle PDB 752 to get the best of the mid lows ?, posted on July 22, 2014 at 20:52:16
hollowboy
Audiophile

Posts: 263
Location: Melbourne
Joined: June 26, 2007
The azura horn website shows the 340hz horn (600mm mouth) playing down to 500hz with small drivers.

On a budget, one can make a similar horn by making a frame from light ply and forming the smooth inner curve from paper mache.

You may as well give it a shot while you save for premium drivers.

 

RE: Which 2" horn for Pyle PDB 752 to get the best of the mid lows ?, posted on July 25, 2014 at 01:07:27
beppe61
Audiophile

Posts: 4705
Joined: January 29, 2004

Hi and thanks a lot for the very interesting advice
This horn here with a 2" throat is really impressive ...
http://www.azurahorn.com/tad_on_204.pdf
Great response indeed.
Ok they are not small by they go impressively low.

" On a budget, one can make a similar horn by making a frame from light ply and forming the smooth inner curve from paper mache "

is there a site/video explaining how to do this ?
I am not that good at DIY ...
Thanks again.
Kind regards,
bg

 

RE: Which 2" horn for Pyle PDB 752 to get the best of the mid lows ?, posted on July 26, 2014 at 01:29:51
hollowboy
Audiophile

Posts: 263
Location: Melbourne
Joined: June 26, 2007

I've given a link to a site showing excellent looking paper horns.

The cruder method I've tried is:

-Cut a horn throat from thick MDF / ply.

-Put spacers (scrap wood) about 5cm thick onto that throat plate, and mount a thin sheet of ply on the spacers, then more spacers, another sheet of ply etc.

-Each of these thin ply sheets has a circle cut into it, of increasing size, which in totality give the contour of the horn. The paper mache fills the gaps.

It's a nice, quiet way to build a speaker - only a couple of steps with tools / dust. You can make it from scraps and a 3 dollar bag of wallpaper glue.
I had a site with construction pics; some glitch deleted most of the photos, so I've attached is the only one I have left.
When I tried it, I used B&C DE950 drivers with a low, 1st order crossover, and they were fine that way (at home listening levels).

 

RE: Which 2" horn for Pyle PDB 752 to get the best of the mid lows ?, posted on July 26, 2014 at 06:42:39
beppe61
Audiophile

Posts: 4705
Joined: January 29, 2004

Hi and thanks a lot again for the very interesting advice
As i said i ma very bad at diy
I will think about it seriously
Thanks again
Kind regards,
bg

 

Page processed in 0.023 seconds.