Hi!
What are the specs or requirements for an open baffle midrange driver, i heard about qts and xmax but i think this is only for the bass end.
I am thinking of purchasing an 8" driver for use as a mid from 100 hz to 1 khz, then a smaller driver possibly a five inch to reproduce from 1 khz to 6 khz.
Can i use any driver or are there specs to be taken into consideration for midrange reproduction. Sorry, i know i have not given full details about this project, i would appreciate just an answer about mids
Thanks.
What are the specs or requirements for an open baffle midrange driver, i heard about qts and xmax but i think this is only for the bass end.
I am thinking of purchasing an 8" driver for use as a mid from 100 hz to 1 khz, then a smaller driver possibly a five inch to reproduce from 1 khz to 6 khz.
Can i use any driver or are there specs to be taken into consideration for midrange reproduction. Sorry, i know i have not given full details about this project, i would appreciate just an answer about mids
Thanks.
Others will be able to comment better than I but getting a 5" to reach up to 6khz may be a bit of a stretch and will be beaming by then and into cone break up territory, maybe a 2" dome (Morel EM1308 or MDM55) or 3-4" full range (Scanspeak 10F or TB w4-1337) would be better.
Just an initial thought.
Worth a read, looks like what you are planning - NaO Note II RS Details
Just an initial thought.
Worth a read, looks like what you are planning - NaO Note II RS Details
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Thanks!
I have a few drivers lying around and have the spec sheets for them, if you can tell me what specs to look out for i can see if they are suitable for open baffle use.
I have a few drivers lying around and have the spec sheets for them, if you can tell me what specs to look out for i can see if they are suitable for open baffle use.
It depends a large degree on the size of baffle you intend to use, if much EQ is required then excursion becomes an issue. Have you studied the Linkwitz Lab site?
Following on from post #2 I did a quick model of the NAO Note RS II is Boxsim 2 using 24db high and low passes at the cover frequencies points specified (110, 1k, 6k) and with only a minor tweak to the levels (no notch filter etc, just high/low pass bands) it is almost spot on as is. Brilliant example of how to choose drivers and crossover points/slopes that just work.
I think one of the best combinations is what S. Linkwitz uses in LX521.
Upper Midrange - SEAS MU10RB-SL, H1658-04,
Lower Midrange - SEAS U22REX/P-SL, H1659-08
Both with a minimum baffle for good polar response.
Upper Midrange - SEAS MU10RB-SL, H1658-04,
Lower Midrange - SEAS U22REX/P-SL, H1659-08
Both with a minimum baffle for good polar response.
As one of the earlier posters noted, you really cannot answer this question without also specifying how wide the baffle will be.
With the minimum of no baffle at all, the 8" driver will probably not be able to be used down to 100Hz. As the baffle is widened, you can get closer and closer to that target but may never really get there because the driver's own drooping low end may be in play below 150-200Hz.
At the upper end of the passband you mentioned (1kHz): with no baffle this is just at or above where I would expect the baffle peak to be found for an 8" driver. This often makes the crossover difficult to pull off well. In a larger baffle the baffle peak will actually decrease in frequency from where it is for a nude driver and above the peak there will be some undesired behavior off axis, so you cannot use too wide a baffle without some issues creeping in.
So I would suggest you use the 8" driver in a baffle not much wider than the driver, with the driver near the top of the baffle, and relax your passband requirements on the low end to 200-250Hz but still crossing over around 1kHz, or slightly lower, to the next higher band.
Thanks for the replies, much appreciated.
Sorry for the lack of detail. This is a project i am trying to get the details together for before purchasing the driver units, baffle boards, crossover etc.
Any more suggestions/ feedback please.
Thank you
Sorry for the lack of detail. This is a project i am trying to get the details together for before purchasing the driver units, baffle boards, crossover etc.
Any more suggestions/ feedback please.
Thank you
In any (loudspeaker) project, one must first define the goal. One must consider the size of the room and placement possibilities, max clean spl required and if subwoofer(s) will be used anyway. Open baffle/dipole speakers need space to breat, also sideways!
Next, if one decides to make an open baffle speaker, will it be just a plain board and WAW two-way or is the goal to det dipole dispersion in as wide range as possible.
Next choice is to use multichannel dsp or passive crossover. (fiirst one is warmly recommended, because the project will very much be trial and error...)
Next choice is to consider xo points and slopes - passbands for each "way". This must be in harmony with baffle dimensions and how lowest and highest bands will be mastered - dipole/closed box/cardioid bass, dome/horn/planar tweeters etc. and number of transducers for each way.
Finally comes the choice of transducer names for each duty. Quite soon you will notice that "the best speaker" doesn't exist, you must just avoid gross mishits!
Good pages to learn more:
Linkwitz Lab - Loudspeaker Design
Music and Design
Dipolplus
Prototyping a 4-way open-baffle speaker with the miniDSP 2x4
Next, if one decides to make an open baffle speaker, will it be just a plain board and WAW two-way or is the goal to det dipole dispersion in as wide range as possible.
Next choice is to use multichannel dsp or passive crossover. (fiirst one is warmly recommended, because the project will very much be trial and error...)
Next choice is to consider xo points and slopes - passbands for each "way". This must be in harmony with baffle dimensions and how lowest and highest bands will be mastered - dipole/closed box/cardioid bass, dome/horn/planar tweeters etc. and number of transducers for each way.
Finally comes the choice of transducer names for each duty. Quite soon you will notice that "the best speaker" doesn't exist, you must just avoid gross mishits!
Good pages to learn more:
Linkwitz Lab - Loudspeaker Design
Music and Design
Dipolplus
Prototyping a 4-way open-baffle speaker with the miniDSP 2x4
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Hi!
There are a few crossover calculators online, I enter the crossover frequency and it gives me the inductor and capacitor sizes required. Is it possible to do it the other way around, i enter the capacitor and inductor sizes and the progam tells me the crossover frequency, is there anything online or an equation i could use.
Thanks.
There are a few crossover calculators online, I enter the crossover frequency and it gives me the inductor and capacitor sizes required. Is it possible to do it the other way around, i enter the capacitor and inductor sizes and the progam tells me the crossover frequency, is there anything online or an equation i could use.
Thanks.
At that point I think you're better downloading XSim or VituixCAD and modelling properly. That also lets you account for all the other variables that a generic online calculator cannot - Bafflestep, real world impedance curve vs nominal, real world driver frequency responses etc.
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