Celestion Ditton 15 or 15XR Crossover

Bennyboyph · 2nd January 2006, 08:33 PM

Does anyone know the original capacitor and inductor values used in the Celestion Ditton 15 or 15XR? I've replaced the original HF1300 tweeters with Morel MDT-30se tweeters, to extend the frequency range of my Ditton 15's.

I would now like to build a new crossover for my ditton 15's, suitable for the new tweeter.

Any ideas??

Cheers,
Ben P

dnsey · 2nd January 2006, 09:06 PM

Do you still have the original crossovers? They're rather well made, so I'd be inclined to keep them, and tweak the C values to suit your new drivers, at the same time using modern plastic film types.
If you don't have them still, let me know - I have a pair doing nothing, so we could sort something out

Bennyboyph · 2nd January 2006, 09:26 PM

Yeah I've still got them fitted inside the cabinets. I'm thinking of removing the crossovers from the cabinets, and placing them into an external box with much better binding posts etc. My problem is that I don't really have an idea what capacitor values to use. Should I replace the inductors with more modern designs too? Treble is sounding a bit harsh at the moment.

Cheers!
Ben

sreten · 4th January 2006, 10:39 AM

Hi,

start off adjusting the treble level with resistors in an L-pad arrangement.

Adjusting capacitors without doing this is pointless.

/sreten.

dnsey · 4th January 2006, 03:10 PM

FWIW, the caps in mine are 12uF

Bennyboyph · 4th January 2006, 03:22 PM

Cheers for the capacitor value!! I am a complete newbie to loudspeaker design, what is an L-pad arrangement? I have got these old speakers from my dad, as my old ones were rubbish. I really like the bass on these, and they respond well with my Cyrus II amp +psx. I got the idea for modifying them from a previous thread on this site, though the guy gave some dubious crossover values.

He was recommending wiring a mid/bass driver into the cabinets instead of the ABR, and just wiring onto exisiting crossover.

What do you guys reckon?

Cheers!
Ben

sreten · 4th January 2006, 03:36 PM

Quote:

Originally posted by Bennyboyph
what is an L-pad arrangement?
Ben

Using a series and a parallel resistor to reduce output whilst
maintaining the same input resistance as the raw driver.

For further info do some searching.

Removing the ABR and inserting an extra driver will completely
change the bass and the sound of the speaker, not likely to
be cost effective or even effective IMO.

/sreten.

Bennyboyph · 4th January 2006, 08:26 PM

Cheers for all this help, it is much appreciated!

2nd January 2006, 08:33 PM	#1
Bennyboyph diyAudio Member Join Date: Apr 2005 Location: Manchester	Celestion Ditton 15 or 15XR Crossover Does anyone know the original capacitor and inductor values used in the Celestion Ditton 15 or 15XR? I've replaced the original HF1300 tweeters with Morel MDT-30se tweeters, to extend the frequency range of my Ditton 15's. I would now like to build a new crossover for my ditton 15's, suitable for the new tweeter. Any ideas?? Cheers, Ben P

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2nd January 2006, 09:06 PM	#2
dnsey diyAudio Member Join Date: Mar 2004 Location: Shropshire, England	Do you still have the original crossovers? They're rather well made, so I'd be inclined to keep them, and tweak the C values to suit your new drivers, at the same time using modern plastic film types. If you don't have them still, let me know - I have a pair doing nothing, so we could sort something out

2nd January 2006, 09:26 PM	#3
Bennyboyph diyAudio Member Join Date: Apr 2005 Location: Manchester	Yeah I've still got them fitted inside the cabinets. I'm thinking of removing the crossovers from the cabinets, and placing them into an external box with much better binding posts etc. My problem is that I don't really have an idea what capacitor values to use. Should I replace the inductors with more modern designs too? Treble is sounding a bit harsh at the moment. Cheers! Ben

4th January 2006, 10:39 AM	#4
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, start off adjusting the treble level with resistors in an L-pad arrangement. Adjusting capacitors without doing this is pointless. /sreten.

4th January 2006, 03:10 PM	#5
dnsey diyAudio Member Join Date: Mar 2004 Location: Shropshire, England	FWIW, the caps in mine are 12uF

4th January 2006, 03:22 PM	#6
Bennyboyph diyAudio Member Join Date: Apr 2005 Location: Manchester	Cheers for the capacitor value!! I am a complete newbie to loudspeaker design, what is an L-pad arrangement? I have got these old speakers from my dad, as my old ones were rubbish. I really like the bass on these, and they respond well with my Cyrus II amp +psx. I got the idea for modifying them from a previous thread on this site, though the guy gave some dubious crossover values. He was recommending wiring a mid/bass driver into the cabinets instead of the ABR, and just wiring onto exisiting crossover. What do you guys reckon? Cheers! Ben

4th January 2006, 08:26 PM	#8
Bennyboyph diyAudio Member Join Date: Apr 2005 Location: Manchester	Cheers for all this help, it is much appreciated!

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