Pontus

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  • Participant
    Pontus on · in reply to: 2-way using Dipole15 and horn compression drivers #51360

    Thanks for answering me John, I appreciate it!

    The system you linked to is quite close to what I have in mind except that in my case the woofers would be positioned horizontally and very close to the floor..

    I need to keep the system as invisible as possible. The bench would be white on all sides with the woofers covered by acoustically transparent cloth. The electronics would be placed on shelves behind doors between the bass drivers. The whole thing would look like two horns on top of an elongated box. The whole front would be a one big baffle. This system is for our living room.

    This is a rough sketch of the bench that I have in mind (front view):

    _o_________o__ <– horns
    O O O O <– Dipole15

    The bench itself has a wide front and top. It can have sides. It doesn’t need to have a bottom or a back and it can have internal bracing or whatever is needed. As long as it looks as a simple wide bench. A bit like this but with doors for the electronics: http://www.ikea.com/gb/en/images/products/byas-tv-bench-white__0144833_PE304277_S4.JPG

    I don’t think that I am ready for a 2.5 system. One of the main aspects of this project is the simplicity. As I wrote, my amplifier has built in 2 way crossovers. Going 2.5 would increase the complexity very much. Or could the 2.5 part be implemented with passive components so that the amplifier still would see the system as a 2 way system? An extra power amplifier would not be a problem but I don’t like the idea of dealing with complicated external electronic crossovers.


    Participant
    Pontus on · in reply to: 2-way using Dipole15 and horn compression drivers #51357

    Also:

    5) Could anyone recommend a horn that would play nicely in a smallish room


    Participant
    Pontus on · in reply to: Subwoofer for KEF LS50 monitors #11386

    The KEF LS50 is a small high quality 2-way coaxial minimonitor. At some point in the future I plan on using the subs as stands for the LS50’s and to use a relatively high crossover setting.

    I’m using the Lyngdorf TDAI-2170 (sold the AntiMode) all digital integrated amplifier which has built in DAC and room correction plus electronic crossover for stereo subwoofers. The amplifier allows for an amplifier delay in order to properly time-align the subwoofer with the main speakers. The amplifier comes supplied with a microphone and the DSP does correction to cancel out room modes.

    The stereo crossover allows for the following settings:

    Low pass filter
    Linkwitz Riley 2nd, 4th or 8th order
    Butterworth 1st, 2nd or 4th order
    Crossover frequency 20-9999Hz

    High pass filter
    Linkwitz Riley 2nd, 4th or 8th order
    Butterworth 1st, 2nd or 4th order
    Crossover frequency 20-9999Hz

    Where would you start experimenting with stereo TD18+ drivers? How high would you cross over and what filter settings would you use?


    Participant
    Pontus on · in reply to: Subwoofer for KEF LS50 monitors #11384

    Are there any reasons why I would want the Apollo upgrade taking into account that I will be listening at moderate levels? If the SQ is better, then yes I will go for it, but if the difference is audible at high SPLs only then I will probably skip this option.


    Participant
    Pontus on · in reply to: Subwoofer for KEF LS50 monitors #11382

    Thank you for taking the time to answer!

    I wrote dipole when I meant bipole. Opposing drivers to cancel out net forces sound like a good idea.

    I think that I would like to try dual opposed subfoofers. At the moment I only have room for one box in my living room but if I move to a larger house I could build new enclosures and go for a stereo single driver solution. This way I get to use both drivers right away.

    I’m afraid that I still have a lot of questions.
    1) Should I get the 4 ohm or the 8 ohm versions? I’m not sure but I think it goes like this: If I use the 4 ohm drivers I would connect them in serial for the dual opposed sub for an 8 ohm load. For single driver stereo use I would end up with 4 ohm loads. If I use 8 ohm drivers I would connect them in parallell for the dual opposed sub (4 ohm load) and for single driver use I would end up with a load of 8 ohms per subfoofer. How should I choose?
    2) Is the recommended volume 150 liters for dual opposed subs as well?
    3) Should the drivers share the same volume? If not, the total volume of the box with two chambers would grow to 300 liters which is starting to get big.
    4) Is the 150 liters net volume or gross volume? Should the displacement of the driver be taken into account?
    5) You wrote that 150 liters vented would be perfect. Did you mean to say closed? If you meant vented, what should the tuning frequency be? 25hz?

    I hope that you can find the time to answer my questions, I know it is a lot to ask. I should be able to design my own subs If I want to DIY but I’m not knowledgeable enough. I do love putting the things together though, and to proudly use something that I have built myself. Thanks again!

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