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I know the aluminium diaphragms were intended for use 500hz & up only. Are there diaphragms out there that'll do 300hz in a 311-60 horn with the larger (288-16G size) pot? 290 pots are different rightand the diaphragms aren't interchangable right?
Ken http://www.hostboard.com/forums/
I think that you are beginner and Hi Fi consumer to the Altec VOT.
Who told you 288s aluminum coils use for 500Hz or up only? Have you tried?
The 311-60 horns are designed for 300Hz but not exacted. Then to down to 300Hz is not depended from coil. The active crossover or custom crossovers (not any N500s) and technical you must have. The experienced of Hi Fi audio are also needed.
Many VOT users were succeeded to set their 311s or 803 horns with 288 drivers (included16G) down to around 250Hz. Then some users could set their 1505B horns with 288s(Alnico) to down to 200Hz! However, 288s also have a limit. Cause those are not full range. Just you are quail.
Alright Mr Smartypants read this!! http://www.hostboard.com/forums/
300hz & 288 drivers
Read Todd White's response on 31 Oct. Troll http://www.hostboard.com/forums/
And yes I have tried. I use 288-16G drivers on Vitavox 220hz multicell horns. I don't know what you settle for but, this setup is not good enough for me! BTW, I don't care for HF, I use them up to 5khz only, so I('d rather have the phenolic diaphragm 290 drivers. And I biamp.
As for the name calling.... You are chicken http://www.hostboard.com/forums/
Hi, Two factors to consider here. If your crossover is just a simple single capacitor then you are doing 6 db per octave. With this type of crossover a 500 hertz signal will have quite a bit of energy flowing to the driver even at 250 hz and could cause damage. If on the other hand you have a 12 or higher db per octave crossover then the energy flowing at the low frequencies tapers off quickly and you can safely run down to the 300 hertz range.
The second factor is the horn. The horn provides load and control down to the horns lower limit. So the driver on an 800 hz horn if driven too far below the lower limit of the horn will not be properly loaded and can be damaged.
So, with your 288 bolted to a 311-60 you should be able to go down to 300 hz safely if you have a crossover that is at least 12 db per octave. It would be preferable to use an 18 or 24 db per octave crossover if you are going to crossover at the lowest possible frequency of 300.
Regards,
Dave,
Is using a 288 w/311 horn with a N500 crossover defeating the advantage of using that setup over a 511B/802 setup, since the crossover is 500Hz in either case?
Hi Charles, I believe it would. I suspect that the 511/802 would probably be preferable if crossing over at 500 hz because of the HF response. I think you will find the 288 probably tapers off much sooner than the 802.
Regards,
I remind that the contents of my previous mention are for the home use only. Not suits for the real theaters and out door use. I suppose that although you have built a home theater. You never need higher power signals to fill with any 288s driver in your room. So, set the crossovers to lower frequency to intend to get the better result is possible but dangerous. Just see how much courage you have and how much money you willing to pay. Cause just a pair great matched coils are not cheap and many parts will be wasted when the final version of passive crossovers are complete to built. Otherwise, you needed be very carefully, cause you maybe never hear anything again if you make any mistake on your system setup.
If you feel interested to improve the sounds quality of your system. You do not just always concerned how many amplifiers have connected to use for, neither to care about how greater look for the other peoples. You should clearly to read again the previous explanations by Dave. That is very useful and good suggestion at you. And to understand what Hi Fi is. Too many quality audio systems have been wasted, just like you. I have heard that more systems could just provide about 10% only of result. (Don?t feel laughably or wondered) There caused by the users without did any effect improvement for their Hi Fi systems. Depended to the adverts in magazines only. Especially they lacked exactly adjustment and experienced. Anyway, some of basically instruments are must if you never know how to taste to the music. More peoples can be able to let their systems provide greatest sounds of music without any instruments helped. And more what $50,000 new Hi End systems were knockout by their old things. There are the reasons what I have interested to come here. And why I was give up to the new audio products and then to collecting a lot of vintage speaker units to combine with by myself. To think about why some old used speakers can be selling such expensive in present. Why others just can selling lower then $10?
I preferred 311-60. Causes it can provide more exactly focus at home space then the 311-90. Except your home is too big as theater. If not, you cannot reject to my viewpoints. Again, my ideas just suit for the home use as Hi Fi system only. Cannot to compare with Todd?s professional opinions. You must know that he needs to consider to all probabilities as theaters, outdoors, and also home use etc, not merely to the HiFi. Cause I agreed he is a specialist of Altec VOTT certainly. So, he cannot just to publish any audio literatures those are talking about home use only. But I just only point to the Hi Fi sounds without any tenders that included systems be burned away? understand?
Dave, I agreed your opinions so much. But I think this Charlie unable to handle the 288s. You should know those (288s) not easy to control. It would be roll off between 11.5kHz to around 12kHz in many cases. Therefore, I think 802+511+N500 may be a very good choice for him. Then he can get more choice to the woofer to match with.