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philip banyer View Drop Down
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Joined: 27 October 2004
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    Posted: 16 May 2023 at 8:35pm
Hi im looking for some advice please. I have 8 pd 158s I would like to put them into double 15s cabinets total 4 cabnets. They would be crossed from 70hz or even a bit higher. For the high then crossed to a beyma cd10fe tweeter as I have a lot of these spare.                         
I release it's not perfect but most likely it could work somewhat.   
   Could someone please recommend me some plans that could use.
          
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Points: 338 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Xoc1 Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2023 at 9:43pm
I think a single 15 to 1" might work as the PD158 has a reasonable HF response but, any 15 to 1" combo is likely to be a compromise with beaming from the 15".
Trying to get a pair of 15" drivers to crossover to a 1" is likely to be very messy.

Then I thought of Graham Audio who use slot loading to improve dispersion from larger drivers. Maybe something like that could work, if you are determined to make something with the drivers you have!


Edited by Xoc1 - 16 May 2023 at 9:45pm
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philip banyer View Drop Down
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Points: 19 		Post Options Post Options   Thanks (0) Thanks(0)   Quote philip banyer Quote  Post ReplyReply Direct Link To This Post Posted: 17 May 2023 at 9:07am
Thank you for your reply. 
I had not thought much about the beaming problem.
Possibly joining 2 tweeters together with an y adaptor to a larger horn may help?
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levyte357- View Drop Down
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When you really power the 15s, overall sound will be terrible.

PD158 is one of my fav 15" drivers, but they are not designed to xover into a tweeter..
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Xoc1 View Drop Down
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Points: 338 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Xoc1 Quote  Post ReplyReply Direct Link To This Post Posted: 17 May 2023 at 10:00am
Not What PD themselves say ? 
But I have not used them personally

PD.158

SUB BASS DRIVER
  • Heavy-duty cast aluminium Chassis for increased rigidity
  • Double suspension system
  • Easy integration with 1″ or 2″ compression drivers
  • Effective transducer in a variety of versatile applications
  • Also suitable for 1×15″ or 2×15″ horn loaded/bandpass sub bass designs
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levyte357- View Drop Down
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Points: 8003 		Post Options Post Options   Thanks (0) Thanks(0)   Quote levyte357- Quote  Post ReplyReply Direct Link To This Post Posted: 17 May 2023 at 10:41am
Originally posted by Xoc1 Xoc1 wrote:

Not What PD themselves say ? 
But I have not used them personally

PD.158

SUB BASS DRIVER
  • Heavy-duty cast aluminium Chassis for increased rigidity
  • Double suspension system
  • Easy integration with 1″ or 2″ compression drivers
  • Effective transducer in a variety of versatile applications
  • Also suitable for 1×15″ or 2×15″ horn loaded/bandpass sub bass designs


OP say's he wants to crossover into a Tweeter !!!
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levyte357- View Drop Down
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Joined: 27 July 2012
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Points: 8003 		Post Options Post Options   Thanks (0) Thanks(0)   Quote levyte357- Quote  Post ReplyReply Direct Link To This Post Posted: 17 May 2023 at 10:43am
Originally posted by Xoc1 Xoc1 wrote:

Not What PD themselves say ? 
But I have not used them personally

PD.158

SUB BASS DRIVER
  • Heavy-duty cast aluminium Chassis for increased rigidity
  • Double suspension system
  • Easy integration with 1″ or 2″ compression drivers
  • Effective transducer in a variety of versatile applications
  • Also suitable for 1×15″ or 2×15″ horn loaded/bandpass sub bass designs



Originally posted by philip banyer philip banyer wrote:

Hi im looking for some advice please. I have 8 pd 158s I would like to put them into double 15s cabinets total 4 cabnets. They would be crossed from 70hz or even a bit higher. For the high then crossed to a beyma cd10fe tweeter as I have a lot of these spare.                         
I release it's not perfect but most likely it could work somewhat.   
   Could someone please recommend me some plans that could use.
          

OP say's he wants to crossover into a Tweeter !!!
Global Depopulation - Alive and Killing.
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Xoc1 View Drop Down
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Points: 338 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Xoc1 Quote  Post ReplyReply Direct Link To This Post Posted: 17 May 2023 at 1:10pm
The beyma cd10fe
Is definitely a 1" compression Driver.
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levyte357- View Drop Down
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Points: 8003 		Post Options Post Options   Thanks (0) Thanks(0)   Quote levyte357- Quote  Post ReplyReply Direct Link To This Post Posted: 17 May 2023 at 1:50pm
Originally posted by Xoc1 Xoc1 wrote:

The beyma cd10fe
Is definitely a 1" compression Driver.



Why did he say "Tweeter then" !?

Most cabs that have 15" and 1", have gap in freq between them, as most 15s dojn't sound too good over 1khz, and most 1" won't sound that great or last that long, coming in at 1khz.

Now 12" drivers run upto 2.4khz, and then crossed into 1",  different kettle of fish.
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snowflake View Drop Down
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if a 15" is beaming at 1kHz then a 12" will be beaming at 1.25kHz. 12" to 1.4" means better vocals with a little less top end response.
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levyte357- View Drop Down
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Points: 8003 		Post Options Post Options   Thanks (0) Thanks(0)   Quote levyte357- Quote  Post ReplyReply Direct Link To This Post Posted: 17 May 2023 at 2:40pm
Originally posted by snowflake snowflake wrote:

if a 15" is beaming at 1kHz then a 12" will be beaming at 1.25kHz. 12" to 1.4" means better vocals with a little less top end response.


I've always found it quite easy to get smooth sound, from 2x12 reflexs upto 2khz, with 1"/1.4"/2" above.

if not using bullets above 2" comps, then running 12s upto approx 2.4khz, allows Beyma CP750TI/B&C De85 2" Comps, to give just enough sparkle around 15khz.

With shaping eq, obviously.
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