Antony Bro can you make me a copy of the crossover network you will be making for this speakers ... i will happily pay the charges.... i am from a med field (a pharmacist) and no ideas about the making or how to calculate or what to calculate about a speaker
Collaborative two way bookshelf loudspeaker project
- Thread starter t.antony
- Start date
That wouldn't be a problem if there is sufficient interest to enable a group buy.
This is how I foresee the development of this project
- One of the volunteer's constructs the enclosures and hands it over to me along with the drivers
- I will build the first version of crossover and do the necessary crossover tweaks
- Enclosures and crossovers will be returned to the volunteer for final finish
- Take acoustical measurements and post it in the forum.
- Do a listening test and evaluate the project in the forum.
I think our volunteers are still lagging behind with the enclosure build. May be we can see some progress after the carpentry workshop
Enclosure size might work for both drivers but crossover won't.
From your quote in other thread:
"@Neeraj
I was not very convinced with the impedance response of this driver - the high freq extension looked good, may be slightly better than the M-130, but there seemed like some major cone breakup issues exist around 1.8kHz. As I was not interested in making the crossover design complex, focused more on the paper cone drivers.
I think it is a usable driver, but can't say anything conclusive as I have not tested it. "
As you are using this driver now are you facing any issues in crossover design or other cone break up issue. What is your suggestion on paper cone cutoff frequency.
Is the tweeter in My MTM thread is T25SN06?
Regards,
Vijay
"@Neeraj
I was not very convinced with the impedance response of this driver - the high freq extension looked good, may be slightly better than the M-130, but there seemed like some major cone breakup issues exist around 1.8kHz. As I was not interested in making the crossover design complex, focused more on the paper cone drivers.
I think it is a usable driver, but can't say anything conclusive as I have not tested it. "
As you are using this driver now are you facing any issues in crossover design or other cone break up issue. What is your suggestion on paper cone cutoff frequency.
Is the tweeter in My MTM thread is T25SN06?
Regards,
Vijay
My opinion changed after listening to the driver. Compared to the paper cone the upper midrange is much more detailed. I have not found the 1.8Khz peak causing any notable auditory discordance - may be my perception of the cone breakup translates as "details in music"?
. I will revisit it at the time of tuning the crossover after listening tests by fellow members.
The paper cone is very good till 1.5KHz, beyond that I tend to like the sound of the Kevlar.
I think I am using the same tweeter in my MTM, however the mounting plate looks a bit different in the picture.
babbudi85
New Member
My opinion changed after listening to the driver. Compared to the paper cone the upper midrange is much more detailed. I have not found the 1.8Khz peak causing any notable auditory discordance - may be my perception of the cone breakup translates as "details in music"?
I will revisit it at the time of tuning the crossover after listening tests by fellow members.
The paper cone is very good till 1.5KHz, beyond that I tend to like the sound of the Kevlar.
I think I am using the same tweeter in my MTM, however the mounting plate looks a bit different in the picture.
I am eagerly waiting to build these speakers. any updates.
I have already stocked the drivers.
keith_correa
Well-Known Member
Yes, where did this initiative go to?
keith_correa
Well-Known Member
Hi! was this built by the 2 folks who were supposed to procure drivers, build the enclosures, hand you the enclosures with drivers mounted for x-over tweaking?
babbudi85
New Member
Here is the enclosure construction plan, I will share the crossover details later
Thanks Antony. Will start enclosure very soon.
If you can post crossover. I can start procuring Components.
Cheers
That was the initial plan, but so far none in Bangalore built the enclosures so thought of posting the plan here for the benefit of others.
I will share schematic of simulated crossover, but as indicated before, actual enclosure is needed for fine tuning the crossover. Once a volunteer build the enclosures we will see how these things can be worked out.
keith_correa
Well-Known Member
Anthony, couple of questions:
What program/tool did you use to calculate the box volume?
What is the box tuned at?
How much of BSC is in your x-over?
What program/tool did you use to calculate the box volume?
What is the box tuned at?
How much of BSC is in your x-over?
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I often end up using multiple enclosure simulators for volume calculations. For this design it was mainly Unibox and Martin's Mathcad worksheets.
Box is tuned around 45Hz.
I used Jeff Bagby's passive crossover designer for modeling crossover and IIRC more than 8db attenuation is happening past 700Hz. Here is the simulated response of the crossover.
babbudi85
New Member
I often end up using multiple enclosure simulators for volume calculations. For this design it was mainly Unibox and Martin's Mathcad worksheets.
Box is tuned around 45Hz.
I used Jeff Bagby's passive crossover designer for modeling crossover and IIRC more than 8db attenuation is happening past 700Hz. Here is the simulated response of the crossover.
how much would be the difference between your stimulated crossover and and measured crossover.
If you can post Xover ,Parts can be sourced. Inductors are tough to source and will take time.
keith_correa
Well-Known Member
How much stuffing density does MJK's worksheet suggest?
Antony
If Box is tuned( Fb ) at 45 Hz , then -3dB frequency might be in range of 85-110 Hz depending upon Port length and damping for this particular kevlar driver.
Don't you think lower frequency will start sounding low when -3dB start rolling off(drop starting too soon ) so high than than Fb frequency or you have managed to compensate for this ?
How about reducing port length to say 5" and tuning box in region of 50-55 Hz that will bring cutoff frequency lower.
If Box is tuned( Fb ) at 45 Hz , then -3dB frequency might be in range of 85-110 Hz depending upon Port length and damping for this particular kevlar driver.
Don't you think lower frequency will start sounding low when -3dB start rolling off(drop starting too soon ) so high than than Fb frequency or you have managed to compensate for this ?
How about reducing port length to say 5" and tuning box in region of 50-55 Hz that will bring cutoff frequency lower.
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Tuning low doen't really warrant less gain at lower frequencies considering room gain into account.
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