Thanks. Yes, one stereo amp. It is a DIY Nelson Pass A40 that I put into three chassis to look similar to the Dynaco ST-70 tube amp. It's 40 watts of Class A per channel.
For BMS the 4550 1" would be a better selection than the 4554, 1.4"
The 4550 will crossover lower.
Hi Helmuth, I think Mr. Crites makes some pretty good xovers with Sonicaps... Or at least in my research, I have not come across anyone complaining about them.
My comment is based on the 1" Selenium D220Ti, which sounds harsh to my ears and measures higher distortion than the CP27 driver that I just put in my system and changed nothing else.
Attached are two distortion measurements with the only change being the 1" compression drivers. As mentioned, they xover at 5 kHz. There is a big rise in distortion at 6 kHz on the D220Ti compared to the CP27. It is quite audible.
Maybe I got a bad batch of 220Ti, or this is the way they are, I don't know...
I am looking forward to installing the BMS 4540ND to see what they sound like and measure.
Cheers!
Attachments
When they distort the cause is clear
I own a pair of bms 4540. They are good but in the long run I did not like them enough a bit to thin.
A popular 1" is the RCF cd350 polyester.
RCF - CD350
I had the chance to test the DE25 very nice clear sound on janzen superior-Z.
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I was reading more about the Cornscala design.
Have a fun club, people says have good bass performance of Klipch Cornwall, and good mid high qualities of La Scala.
It's a >100db design. My amplifier has 0.7W with 71A and 1.5W with 45 so sensitibity is very needed.
To be honest, it's a bulky design, is harder to make it look nicer.
I am thinking about starting my own project (not an identical copy) based on the general aproach of the Cornscala.
1. Use my Eminence Omega 18A Pro in a Bass reflex config. front vented.
2. Put the horns outside the enclosure, probably this reduces coupling, but in really I think it will look better and can make it modular, so will be easier to change components.
3. I will look for the tweeter later, It could be the 2405.
4. So the Job now is to define what wooden horn and what compression driver should I use.
Note1: Eminence Omega 18A pro, doesnt have 100db. And my understanding is that a BR only will give more bass extension. At the moment I will think on attenuating more the highs, until I get a better bass. But I still would like to think in options for the bass, to start planning ahead.
Note2: I have a pair of 41hz SS 20W and 100W amplifier, another option would be use that for the woofer. I m just afraid of loosing phase integrity when using two amplifiers.
Please let me know any concerns about this thinking.
Best,
Charly
Have a fun club, people says have good bass performance of Klipch Cornwall, and good mid high qualities of La Scala.
It's a >100db design. My amplifier has 0.7W with 71A and 1.5W with 45 so sensitibity is very needed.
To be honest, it's a bulky design, is harder to make it look nicer.
I am thinking about starting my own project (not an identical copy) based on the general aproach of the Cornscala.
1. Use my Eminence Omega 18A Pro in a Bass reflex config. front vented.
2. Put the horns outside the enclosure, probably this reduces coupling, but in really I think it will look better and can make it modular, so will be easier to change components.
3. I will look for the tweeter later, It could be the 2405.
4. So the Job now is to define what wooden horn and what compression driver should I use.
Note1: Eminence Omega 18A pro, doesnt have 100db. And my understanding is that a BR only will give more bass extension. At the moment I will think on attenuating more the highs, until I get a better bass. But I still would like to think in options for the bass, to start planning ahead.
Note2: I have a pair of 41hz SS 20W and 100W amplifier, another option would be use that for the woofer. I m just afraid of loosing phase integrity when using two amplifiers.
Please let me know any concerns about this thinking.
Best,
Charly
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can that sound better than horns?
remember everything started with the idea of having CDs and Horns.
Speaker Detail | Eminence Speaker
An externally hosted image should be here but it was not working when we last tested it.
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JBL wave guide.
QSC PL-000446GP Replacement Waveguide Horn for HPR152i 245-625
Not expensive and better then a horn.
Denovo SEOS-12 Waveguide 2/3 Bolt Gloss with Adapter 300-7069
celestion
Celestion CDX1-1425 Neo 1" Compression Driver 25W 294-2132
QSC PL-000446GP Replacement Waveguide Horn for HPR152i 245-625
Not expensive and better then a horn.
Denovo SEOS-12 Waveguide 2/3 Bolt Gloss with Adapter 300-7069
celestion
An externally hosted image should be here but it was not working when we last tested it.
Celestion CDX1-1425 Neo 1" Compression Driver 25W 294-2132
An externally hosted image should be here but it was not working when we last tested it.
Attachments
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looks like a nice mid.Eminence LA6-CBMR 6
http://www.eminence.com/pdf/LA6_CBMR.pdf
See the response.
http://www.parts-express.com/pe/showdetl.cfm?partnumber=290-542
http://www.eminence.com/pdf/LA6_CBMR.pdf
See the response.
http://www.parts-express.com/pe/showdetl.cfm?partnumber=290-542
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Yep, I know I am difficult and going around circles, but I am really biased towards a Bin Bass (Bass reflex for instance) and a Horn that can do all the work.
Helmuth proposed that at the start of the tread, but then I started arguying about highs dispersion. and we started adding more drivers.
When I talked about JBL 2405, to improve dispersion, we start talking about combing filtering.
I like the original 2 way proposal. And if I want to add a tweeter later, seems like combing filtering shouldnt be an issue at arround 10khz.
For me, adding a paralel tweeter with a cap, doesn't look like adding another way to the XO....
The other important thing to remember is that I need speakers for a 71A tube amplifier, that is 0.7W rms.
So I need >100db of sensitivity.
I think I can start experimenting with my current OB bass bin (Omega18) and change that later.
I will use my DAC and a small SS to power the bass.
That will give 0.7W for Mid and Bass.
So I should be basicallly looking just for a good Mid/High Horn that can matches a 15inch/18inch driver.
And also, a nice waveguide for this.
Helmuth proposed that at the start of the tread, but then I started arguying about highs dispersion. and we started adding more drivers.
When I talked about JBL 2405, to improve dispersion, we start talking about combing filtering.
I like the original 2 way proposal. And if I want to add a tweeter later, seems like combing filtering shouldnt be an issue at arround 10khz.
For me, adding a paralel tweeter with a cap, doesn't look like adding another way to the XO....
The other important thing to remember is that I need speakers for a 71A tube amplifier, that is 0.7W rms.
So I need >100db of sensitivity.
I think I can start experimenting with my current OB bass bin (Omega18) and change that later.
I will use my DAC and a small SS to power the bass.
That will give 0.7W for Mid and Bass.
So I should be basicallly looking just for a good Mid/High Horn that can matches a 15inch/18inch driver.
And also, a nice waveguide for this.
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Charley when you make up your design goals, then it will become automatically clear witch options will be Left.
100dB 1Wmtr
40Hz-20000Hz
1-2-3-4way?
max dimensions, height, with, deepness?
max power 10W?
steepness filter first,second or fourth order filter.
Maximum cost?
Point to concider:
Waveguide compared to horn is short and wide that will cause less coloration with about same efficiency.
The short wave guide will better match a super tweeter less time delay closer ctc.
A front-loaded bas horn like la scala will make 100-106dB 1wmtr possible and even 110dB in a corner that even with your current omega 18 that does surprisingly well in the simulation. Will make it hard to go 2 way it will become a 3 Way.
A high efficiency mid cone driver is very robust when crossed low. And cost much less then a horn high-frequent driver combination . And it is also much more compact. So you can buy a better 1" HF driver and capacitors.
100dB 1Wmtr
40Hz-20000Hz
1-2-3-4way?
max dimensions, height, with, deepness?
max power 10W?
steepness filter first,second or fourth order filter.
Maximum cost?
Point to concider:
Waveguide compared to horn is short and wide that will cause less coloration with about same efficiency.
The short wave guide will better match a super tweeter less time delay closer ctc.
A front-loaded bas horn like la scala will make 100-106dB 1wmtr possible and even 110dB in a corner that even with your current omega 18 that does surprisingly well in the simulation. Will make it hard to go 2 way it will become a 3 Way.
A high efficiency mid cone driver is very robust when crossed low. And cost much less then a horn high-frequent driver combination . And it is also much more compact. So you can buy a better 1" HF driver and capacitors.
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