I'm thinking it would be good to try an open baffle speaker for my next project so looking for some suggestions/recommendations for potential designs.
Apart from, obviously, excellent sound being a requirement, I need to use them with my existing amplifiers (both SE-OTL designs, delivering about 1.5W pc) so high efficiency is key.
I've found this one at 98dB/W;
http://www.lowther-america.com/Cabinets ... en_Baffle/
Ideas.
Ray
Open Baffle Suggestions
#4
Hi Ray
I think SteveS has been down this road...currently with beyma TPL150(99db)
maybe he'll chip in
I think SteveS has been down this road...currently with beyma TPL150(99db)
maybe he'll chip in
There's nowhere you can be that isn't where you're meant to be
#5
Depends on your budget. Clive Meakins has had considerable success using his Bruce Rozenblit OTL's with Bastini open baffles.
See http://www.trans-fi.com/bastanispeakers.htm
Clive is a member here but does not contribute often these days. If you open the Prometheus Review link, that will give you access to his email address. I know he will be happy to discuss with you if you are interested.
See http://www.trans-fi.com/bastanispeakers.htm
Clive is a member here but does not contribute often these days. If you open the Prometheus Review link, that will give you access to his email address. I know he will be happy to discuss with you if you are interested.
Isn't it enough to see that a garden is beautiful without having to believe that there are fairies at the bottom of it too?
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#6
I had a couple of 12 inch goodman speakers with a pair of ex4's , they would have been better matched with ex/dx3's but i have the 4's .....
There was perfect cross over in my opinion with a simple 1st order crossover, it was just about impossible to hear the differences between the speakers.
As Ed said i moved to the beyma's as they are better in my voew, both pairs i have are again used with twin bass drivers crossing around 1k. There are lots of good technical reasons to use twin bass drivers....but they are worth a try, ther are some really good improvements over back horns, but you need to get the right drivers and spend your time getting the crossover right. I have found with simple 1 st order you quite often need wide spaced cross over points to overcome speaker peaks in the bass drivers, the drivers i use tend to be wide band types by nature, as they are originally pa type speakers.
There was perfect cross over in my opinion with a simple 1st order crossover, it was just about impossible to hear the differences between the speakers.
As Ed said i moved to the beyma's as they are better in my voew, both pairs i have are again used with twin bass drivers crossing around 1k. There are lots of good technical reasons to use twin bass drivers....but they are worth a try, ther are some really good improvements over back horns, but you need to get the right drivers and spend your time getting the crossover right. I have found with simple 1 st order you quite often need wide spaced cross over points to overcome speaker peaks in the bass drivers, the drivers i use tend to be wide band types by nature, as they are originally pa type speakers.
The tube manual is quite like a telephone book. The number of it perfect. It is useful to make it possible to speak with a girl. But we can't see her beautiful face from the telephone number
#7
Ray,
Nick has a Quasar derivative using a fostex FE167 and an Eminence Beta 15 that measures flat from about 38Hz to 20KHz and is about 94dB efficent. Its not small but its good - he demo'd it at several owstons so many here have heard it. Now-a-days the Fostex FE166eN would work well in it.
At more money the Quasar can be made using the Supravox GMF286 bass helper and the Voxitiv AC 1.5 as AER no longer seem to be around... 40Hz to 22KHz and about 96-98dB/1W/1M...
James
Nick has a Quasar derivative using a fostex FE167 and an Eminence Beta 15 that measures flat from about 38Hz to 20KHz and is about 94dB efficent. Its not small but its good - he demo'd it at several owstons so many here have heard it. Now-a-days the Fostex FE166eN would work well in it.
At more money the Quasar can be made using the Supravox GMF286 bass helper and the Voxitiv AC 1.5 as AER no longer seem to be around... 40Hz to 22KHz and about 96-98dB/1W/1M...
James
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IslandPink
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#8
Ooh ... Voxitiv ... looks quite a lot like Feastrex range ... 
"Once you find out ... the Circumstances ; then you can go out"
#9
Voxitiv history.
AER was founded by Fillip Keller who developed the speaker and owned the company. However he was helped by Ines Adler a Material Scientist. They had a parting of the ways and both continued to make the speakers. This ended up in court over the use of the AER name and trade marks and Fillip won.
Ines then set up Voxitiv making a better version of the AER seakers - she also engaged in an extensive development programme to improve the speakers and produce dufferent versions of the driver. She also developed finished Loudspeakers and valve amplifiers to drive them. She has been, and still is, very successful. Oh, Voxitiv won the Stereophile product of the year a couple of years ago.
Meanwhile AER Loudspeakers under Fillip seems to have dissappeared although the website is still up there is no activity. I have emailed Fillip three times in the last year about my AERs and have had no reply... So Voxitiv is the choice if you want to buld the Quasars today... and it might well sound better than the AER equipped Quasars!
Hope that helps
James
AER was founded by Fillip Keller who developed the speaker and owned the company. However he was helped by Ines Adler a Material Scientist. They had a parting of the ways and both continued to make the speakers. This ended up in court over the use of the AER name and trade marks and Fillip won.
Ines then set up Voxitiv making a better version of the AER seakers - she also engaged in an extensive development programme to improve the speakers and produce dufferent versions of the driver. She also developed finished Loudspeakers and valve amplifiers to drive them. She has been, and still is, very successful. Oh, Voxitiv won the Stereophile product of the year a couple of years ago.
Meanwhile AER Loudspeakers under Fillip seems to have dissappeared although the website is still up there is no activity. I have emailed Fillip three times in the last year about my AERs and have had no reply... So Voxitiv is the choice if you want to buld the Quasars today... and it might well sound better than the AER equipped Quasars!
Hope that helps
James
-
IslandPink
- Amstrad Tower of Power
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- Location: Denbigh, N.Wales
#10
Thanks ! Some nice lumps of alnico available there , at a price, I suspect .
"Once you find out ... the Circumstances ; then you can go out"
#11
UK Dealer Pricing:
http://www.howes-acoustics.co.uk/driveunits.html
£1,580 to £23,500 per pair... Alnico starts at £3050....
Of course thats 2012 pricing so they might be more now....
http://www.howes-acoustics.co.uk/driveunits.html
£1,580 to £23,500 per pair... Alnico starts at £3050....
Of course thats 2012 pricing so they might be more now....
#14
Well I guess £6k for a pair of field coil drivers is not that bad considering.JamesD wrote:UK Dealer Pricing:
http://www.howes-acoustics.co.uk/driveunits.html
£1,580 to £23,500 per pair... Alnico starts at £3050....
Of course thats 2012 pricing so they might be more now....
Whenever an honest man discovers that he's mistaken, he will either cease to be mistaken or he will cease to be honest.
#15
Attached is the Quasar design drawing.
And here is the recipe for Nicks version
This is still the best looking design I have for the 167 and Beta 15 - yer
tis:
a)Fostex FE 167E
b)Eminence Beta 15
c)Crossover at 150-200Hz 6DB octave
d)Series connection of drivers
e)inductor bypassing Fostex (value still being tweaked but about 8mH)
f)capacitor bypassing Eminence (value still being tweaked but about 80uF)
g)Front of baffle 450mm wide 135cm high sloped back 5 degrees
h)sides 500mm deep and sloping in a constant line up to the top of the
baffle
i)bottom piece 450mm by 500mm with an air tight seal to front and sides
(very important) - bottom shaped like Quasar is best but this is close
j) Fostex mounted about 750mm above floor
k) Eminence mounted about 100mm -150mm above the floor
And that is basically it for a starting recipe
Sensitivity is 94dB/1W/1m.
Hope that helps
James
And here is the recipe for Nicks version
This is still the best looking design I have for the 167 and Beta 15 - yer
tis:
a)Fostex FE 167E
b)Eminence Beta 15
c)Crossover at 150-200Hz 6DB octave
d)Series connection of drivers
e)inductor bypassing Fostex (value still being tweaked but about 8mH)
f)capacitor bypassing Eminence (value still being tweaked but about 80uF)
g)Front of baffle 450mm wide 135cm high sloped back 5 degrees
h)sides 500mm deep and sloping in a constant line up to the top of the
baffle
i)bottom piece 450mm by 500mm with an air tight seal to front and sides
(very important) - bottom shaped like Quasar is best but this is close
j) Fostex mounted about 750mm above floor
k) Eminence mounted about 100mm -150mm above the floor
And that is basically it for a starting recipe
Sensitivity is 94dB/1W/1m.
Hope that helps
James
- Attachments
-
- Quasar