Understanding John Dunlavy's Crossover Designs Crown Prince - Page 7

Remlab · 1st October 2012, 01:28 AM

Quote:

Originally Posted by Soundtrackmixer

I don't know what tweeter he finally settled on(never opened up the speaker), but I know it was different from the one first installed. So was the crossover once he finished tweaking.

One thing I love about John(and probably one of his biggest weaknesses as a businessman) was his almost compulsive nature at small detail in engineering, and in voicing his speakers. When he found an improvement to something, he would always come back to my studio and install and tweak it. As I said earlier, he came back to my studio four times before walking away from my SC-V - and then eventually getting too sick to return for good. When he told be that each SC-V spent 30hrs in the anechoic chamber, and being listened to and tweak, I was blow away. Makes it worth my investment to know this.

Back in 96, when I bought the SC-1's, I called up the company to see how they were coming along. The secretary put him on the phone. He spent about a half an hour in joyous conversation, talking about his design philosophy(And I was buying the cheapest speaker!). He was an extremely nice(And amazingly talented) guy..

Roxyab · 2nd December 2012, 12:48 PM

Updated crossover from Duntech.

Zero Cool · 2nd December 2012, 01:03 PM

wow that's not even the same PCB?? did yours have that burnt area damage before? totally different layout. I am going to have to study that photo a bit

Roxyab · 2nd December 2012, 01:12 PM

That not the actual one he sent. That is a picture he had sent me but they look the same. I still have my original crossovers.

Roxyab · 01:25 PM

Wiring layout.

Roxyab · 2nd December 2012, 01:27 PM

Please let me know what you think.

Zero Cool · 2nd December 2012, 01:36 PM

I'm stuck halfway through my project as my cap deal fell through. and they are the most expensive part! I would be curious how those Solen MKP caps sound?

Roxyab · 2nd December 2012, 01:45 PM

Its going to take some time before I get them installed. I have spade connectors coming so I can switch back easily before I make them permanent.

Roxyab · 10th December 2012, 09:49 PM

First impression is the space in the sound stage and between the instruments. The voice, no grain at all. The mids to highs smoother. Overall more transparency.

maxitonus · 12th February 2013, 10:15 AM

I'm a french audiophile ,i bought Duntech Crown Prince's used in 1992, switched 3 years later to MBL101's for some years,giving my C P's to my son..
But after some years,i was sooo deceived with the MBL's (and my son uninterested by the C P's)that i recovered my old CP's, changed the 4 woofers (the original model was not exactly the 75,the membrane was different, but impossible to get strictly the same then i bought 75 to Dynaudio..),changed all the caps to SCR MKP's (which is the trademark currently used by Duntech australia,fortunately of french origin, the price is very reasonable..).
About the caps ,i measured the values and adjusted them in order to reproduce exactly the indicated value of the old one..I didnt change resistors neither inductors.

My opinion is:
-extremely dynamic speakers,notably with AR amps (i used classic 60),the best speakers i've ever heard,in particular wide and deep scene,about transients,be careful, could reproduce explosions..
-extremely difficult to perfectly tune since very sensible to any detail,fr example cables.
The section of the low freq cable is very important since influences the recovering zone between woofer and medium..had to reduce section drastically to avoid too much high-bass.(i use bi-wiring flat silver cable for mass,unique fr both lows and highs,,single AWG24 for lows, litz (8X0,28+25X0,05)for highs, adapted to suit to the amp and the remainder..(very short cables, less than 1.3meters.
-Now the amp is a class D ( a classdaudio sds470) which sounds extremely good,better than the formers airtight ATM2 and Ayon TritonII..but difficult to optimize the sound, notably the influence of mains power supply cables is far from negligible.

I will (may be) try to bi-amp with a double classdaudio 4 channel amp,and try a Hypex n-core 1200.
Il any of yu know a speaker which is better, please let me know it...same if anyone has replaced the passive filter with a FIR (in tri-amping mode)

2nd December 2012, 01:03 PM	#63
Zero Cool Audio Junkie diyAudio Member Join Date: Sep 2004 Location: MN	wow that's not even the same PCB?? did yours have that burnt area damage before? totally different layout. I am going to have to study that photo a bit __________________ It's not about what you can BUY...It's about what you can BUILD!

2nd December 2012, 01:36 PM	#67
Zero Cool Audio Junkie diyAudio Member Join Date: Sep 2004 Location: MN	I'm stuck halfway through my project as my cap deal fell through. and they are the most expensive part! I would be curious how those Solen MKP caps sound? __________________ It's not about what you can BUY...It's about what you can BUILD!

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2nd December 2012, 01:27 PM	#66
Roxyab diyAudio Member Join Date: Jul 2012	Please let me know what you think.

2nd December 2012, 01:45 PM	#68
Roxyab diyAudio Member Join Date: Jul 2012	Its going to take some time before I get them installed. I have spade connectors coming so I can switch back easily before I make them permanent.

12th February 2013, 10:15 AM	#70
maxitonus diyAudio Member Join Date: Feb 2013 Location: Marseille, France	I'm a french audiophile ,i bought Duntech Crown Prince's used in 1992, switched 3 years later to MBL101's for some years,giving my C P's to my son.. But after some years,i was sooo deceived with the MBL's (and my son uninterested by the C P's)that i recovered my old CP's, changed the 4 woofers (the original model was not exactly the 75,the membrane was different, but impossible to get strictly the same then i bought 75 to Dynaudio..),changed all the caps to SCR MKP's (which is the trademark currently used by Duntech australia,fortunately of french origin, the price is very reasonable..). About the caps ,i measured the values and adjusted them in order to reproduce exactly the indicated value of the old one..I didnt change resistors neither inductors. My opinion is: -extremely dynamic speakers,notably with AR amps (i used classic 60),the best speakers i've ever heard,in particular wide and deep scene,about transients,be careful, could reproduce explosions.. -extremely difficult to perfectly tune since very sensible to any detail,fr example cables. The section of the low freq cable is very important since influences the recovering zone between woofer and medium..had to reduce section drastically to avoid too much high-bass.(i use bi-wiring flat silver cable for mass,unique fr both lows and highs,,single AWG24 for lows, litz (8X0,28+25X0,05)for highs, adapted to suit to the amp and the remainder..(very short cables, less than 1.3meters. -Now the amp is a class D ( a classdaudio sds470) which sounds extremely good,better than the formers airtight ATM2 and Ayon TritonII..but difficult to optimize the sound, notably the influence of mains power supply cables is far from negligible. I will (may be) try to bi-amp with a double classdaudio 4 channel amp,and try a Hypex n-core 1200. Il any of yu know a speaker which is better, please let me know it...same if anyone has replaced the passive filter with a FIR (in tri-amping mode)