I still think the WAF153.00 seems like a better purchase, much cheaper and not that big of a difference In SPL.
WAF153.00 specs seem like the Celestion FTR18-4080FD
i got some idea and i do not know if it feasible or now
you guys tell me
there is the thread
i can live with the freq and SPL specs of that one, but want to minimize weight
or to say it in another manner, if we filter out the ferrite drivers and leave the light ones only
can we get something to the LAB12 tapped horn but lighter in weight ? 15"'s and 18's drivers welcome
i got some idea and i do not know if it feasible or now
you guys tell me
there is the thread
$325 Lab 12 based PA tapped horn ~ 35Hz extension
it uses the LAB12 , is there something similar in neodymium ?i can live with the freq and SPL specs of that one, but want to minimize weight
or to say it in another manner, if we filter out the ferrite drivers and leave the light ones only
can we get something to the LAB12 tapped horn but lighter in weight ? 15"'s and 18's drivers welcome
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For 150$? Buy them before they go extinct! This is two per 266 liters:
You MUST have Aero ports with those drivers! And you need a 2KW output amplifier as well.
900W per driver.
Two of those boxes (4 drivers) go like this:
150$ each PRV 15SW2000 Clearance at PE is a lot of air shoving ability for the money.
You MUST have Aero ports with those drivers! And you need a 2KW output amplifier as well.
900W per driver.
Two of those boxes (4 drivers) go like this:
150$ each PRV 15SW2000 Clearance at PE is a lot of air shoving ability for the money.
actually 190
they changed the price... just now
very flat to 100 i cross the tops at 125 normally and sometimes i do not give a s,.... about the 25hz gap
so there is this type of vents for dual BR design
the below one is from 18sound for 18" drivers
can we use this for the 15"'s ?
beyma uses ports at the corners in single box and on dual box uses rectangular
they have plans for dual 15's
maybe we can adapt one of those plans , the beyma drivers are $$$
they changed the price... just now
very flat to 100 i cross the tops at 125 normally and sometimes i do not give a s,.... about the 25hz gap
so there is this type of vents for dual BR design
the below one is from 18sound for 18" drivers
can we use this for the 15"'s ?
beyma uses ports at the corners in single box and on dual box uses rectangular
they have plans for dual 15's
maybe we can adapt one of those plans , the beyma drivers are $$$
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You do know that this forum is DIY Audio?
The boxes will have to be planned for the driver you wish to purchase, if you have finally decided which drivers you want to order then we can make actual suggestions and/or building plans.
It takes a bit of time and effort to consider all the various options, so the sooner you make a decision the sooner you can get specific plans.
You can make the design in a number of different ways, the look and layout can be adapted somewhat, but it has to be planned and simulated so you have a basic idea of what to expect.
The boxes will have to be planned for the driver you wish to purchase, if you have finally decided which drivers you want to order then we can make actual suggestions and/or building plans.
It takes a bit of time and effort to consider all the various options, so the sooner you make a decision the sooner you can get specific plans.
You can make the design in a number of different ways, the look and layout can be adapted somewhat, but it has to be planned and simulated so you have a basic idea of what to expect.
I know, just pasted those to ask if we can use those types of vents, those are not the regular tube round vents other BR have.
i think i will got with the PRV 15SW2000 now they are at 190 bit still i think they are good for what they offer
what you think
Hard to beat those for the money.
The vents can be calculated in many different ways, the dimensions have to be adapted a bit but shape does not carry much significance other than perhaps enhanced structural integrity for some types which allow for less bracing. If looks are important to you then I guess it's possible to get the numbers right in some way or the other. Just say which one you want.
The vents can be calculated in many different ways, the dimensions have to be adapted a bit but shape does not carry much significance other than perhaps enhanced structural integrity for some types which allow for less bracing. If looks are important to you then I guess it's possible to get the numbers right in some way or the other. Just say which one you want.
Question
dayton UM18-22 is for HT only?
or can be used for PA
as it came bundled with a sealed sub flatpack kit
dayton UM18-22 is for HT only?
or can be used for PA
as it came bundled with a sealed sub flatpack kit
You can use any speaker for anything within its passband. Efficiency is the issue for PA. HT is about getting low.
HT drivers are around 90db.
PA drivers are closer to 100db.
HT drivers are heavy.
PA drivers are lighter.
HT drivers have big enclosures.
PA drivers have smaller enclosures.
Hofmann's Law...loud, low, small...pick 2.
HT drivers are around 90db.
PA drivers are closer to 100db.
HT drivers are heavy.
PA drivers are lighter.
HT drivers have big enclosures.
PA drivers have smaller enclosures.
Hofmann's Law...loud, low, small...pick 2.
Hofmann's Iron Law is actually: efficient, low, small, pick two.
High excursion drivers in small boxes can go loud, but are not efficient.
If you are willing to pay for the loss in efficiency, loud, low and small are possible.
Most of the speakers Hofmann designed at KLH, Advent, and AR sacrificed efficiency for small size with low frequency extension.
Loudspeaker efficiency is the ratio of total acoustical output power to electrical input power, measured in watts, expressed as a percentage. A 1% efficient loudspeaker uses one watt at one meter to produce 92dB SPL, 95dB 1w/1m is 2%, 98dB is 4%, and so on.
"Loud" is a relative term, but lets agree that a higher SPL (sound pressure level) is louder.
Efficiency does not equal SPL, they are different terms in Hofmann's Iron Law: efficient, low, small, pick two.
A speaker with less efficiency, but more displacement capability can put out more low frequency SPL using a small enclosure, it simply requires more electrical input power to achieve the same or greater SPL.
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best explanation in simple terms on what is eficiency!!! you rock welter!
why you dont write a 101 note book about this things. aka SUB DESIGN FOR DUMMIES,
or
(i use to have several of the following)
Radio Shack use to sell:
741 op amp cookbook
TTL logic cookbook
555 timer cookbook
and so on, those things flew of the shelf every weekend.
those was the 80's
i missed them.
Ok Kaffi, 2 PRV 15SW2000 , if we use lets say the size of a srx828 can we hit 30hz?
How about an audio technical Encyclopedia?
Audio calculations
Efficiency
Site search engine for so much more
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Those drivers are very hard to persuade to go lower in a good way, putting them in a bigger box at 330 liters or so and tuning it lower will make that particular hump more pronounced:
It is a bit on the edge of what a high FS + high QTS driver like that is able to do.
If we apply a 30Hz 4th order Butterworth filter at 30Hz we get this:
And as long as you apply the 30Hz HP you do not have to worry about chuffing either, it will be just about inaudible at this SPL, and 30Hz notes at full voltage are a bit rare:
Group delay will increase because of the filter, but it is still below 20msec at 40Hz so it is not noticeable.
From 50Hz up it should be just about impossible to tell this box apart from a closed box, from 50 hz down you get a lot more SPL and compared to a Linkwitz Transform solution this bassreflex will have better power handling and much higher spl. The difference in group delay between this and previously mentioned closed box with LT would be negligible at best.
Edit:
And driver power is around 600-1000 Watts at this level, so you need 2kW per sub.
Edit2:
After applying a 150Hz 4th order low pass you get this:
You get slightly more breathing space for your tops than if you choose another type of design.
Edit3:
Two of those boxes, so 4 drivers in total, gets you just over 131dB/30Hz:
Edit4:
Sorry about all the editing, just wanted to show the power per driver after applying active filters:
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