john@aespeakers.com

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Viewing 15 posts - 1 through 15 (of 57 total)

  • Keymaster
    john@aespeakers.com on · in reply to: Dipoke15 vs lo15 #51469

    Hello Eric,

    The LO15 have about 9-10mm Xmax compared to 15mm Xmax on the Dipole15’s. This allows the Dipole15 to play lower due to more volume displacement. How low and loud is really determined mostly by the baffle size and style. I typically target about 35hz as the minimum for the LO15. At 2 per side, you would have good output to that point.

    If you wish to go below that, the Dipole15 or even Dipole18 is the better option. Typically only going up to 250-300hz, the Dipole will be the best option so you also get more low end extension.


    Keymaster
    john@aespeakers.com on · in reply to: Dipole 18 Measuring data and facts #51468

    Hello Hörby,

    We do not currently have a good data sheet that has all of this information. It is something I do plan to do, but I can’t currently find the time. It has not been a top priority as no other woofers have this data done in any kind of valid comparable format. The only real way to get this data in comparison to other drivers is to measure them all in the same enclosure. I can guarantee you that no others go through the efforts to reduce distortion that we do.

    Frequency response on these woofers is very hard to provide to customers because the low end response is primarily determined by the baffle used. I can measure an infinitely baffled response. However, this typically confuses people as there is no rolloff from the baffle. They expect to see the same response when putting a driver on a small baffle but that is just not possible.

    The upper end of our response is really determined by the driver diameter. Above about 600hz an 18″ driver narrows to less than 90 degrees. Typically you wouldn’t use them higher than that, but on an open baffle you likely won’t need more than 60 degrees so you can go a little higher. The Dipole18 are however flat on axis to over 2KHz. Here are a few measurements on U, H, and open baffles. You can see they all extend very well to that 2KHz point. Below 200hz is primarily due to the baffle response.

    Dipole18 UHO Comparisons

    The Bl curve being extremely linear is critical in keeping distortion down. This also means that T/S parameters will not change throughout the excursion of the driver. It is nearly perfectly flat throughout the +/-15mm range. You can see a measured Bl curve from our Dipole woofers. The measurement on the right is the second sample.

    Dipole BL Curve

    Impedance is also perfectly linear within this range due to the Full Copper Faraday Sleeve. You can see several of our 15″ drivers measured here and all have flawless Le(x) curves that do not change even at extreme excursions. This is a characteristic of all of our woofers.

    https://sites.google.com/site/drivervault/driver-measurements/15

    The Bl and Le linearity are significant in reducing the odd order, especially 3rd order harmonic distortions. No other motors out there go through these efforts. Solid material design is critical in addressing the even order distortions. We have fully optimized our spiders, cones, surrounds, and voice coils to be free from resonance. We also hand seal and treat the cloth surrounds to further damp resonances.

    All of these are reasons some of the best systems in the world use our Dipole woofers. Spatial just recently began using the Dipole18 in their new X-1 for all of the above reasons.

    http://www.spatialaudio.us/x1-main

    Best Regards,
    John


    Keymaster
    john@aespeakers.com on · in reply to: Aperiodic venting, driver recs #51467

    Hello,

    Figured I would reply here also in case others wish to see. The aperiodic will smooth the impedance peak and lower the Qtc some. However, this comes at a loss of output as well. This will also decrease the max output of the system as it is really like a lossy enclosure. More power would be needed to compensate. I see EQ and larger power a more useful option. The overall maximum SPL would not be decreased.


    Keymaster
    john@aespeakers.com on · in reply to: TD12M or TD15M for low midrange application #51455

    Any 15″ driver is going to narrow to less than 90 degrees between 800-900hz. Typically you wouldn’t want to go higher than that with any 15″. A 12″ driver gets up a little higher to around 1200hz. If you are wanting to get to 1800hz, then a 10″ or 8″ driver is more ideal.

    If your waveguide happens to be only 60 degrees, then you can push any of those options higher in frequency. A 15″ could get you to 1200hz or so and 12″ up to 1800hz range.

    Best Regards,
    John


    Keymaster
    john@aespeakers.com on · in reply to: Need surrounds to go with TD15M but 10" #51450

    Yes, vented cabinet with 60hz tuning.


    Keymaster
    john@aespeakers.com on · in reply to: Need surrounds to go with TD15M but 10" #51448

    If you go with a 20L enclosure, tuned to 60hz, this gives an F3 of 65hz. This would work out very well to get down to 80hz. It also keeps the peak in group delay and vent velocity down under the intended passband.

    Best Regards,
    John


    Keymaster
    john@aespeakers.com on · in reply to: TD12M or TD15M for low midrange application #51447

    Hello,
    Yes, the TD15M is going to be an even better option. More efficiency and more overall displacement with the larger diaphragm. Crossing at 600-700hz is not a problem at all. We routinely cross between 800-900hz and even higher if less than 90 degrees dispersion is required.
    If you have DSP, you could likely get away with a sealed cabinet. The midrange domes will likely limit the system before the TD15M. If you want more overall SPL down lower, I would go with a vented box tuned to about 50hz. This keeps the bump in group delay and peak in vent velocity low and out of the passband.

    Best Regards,
    John


    Keymaster
    john@aespeakers.com on · in reply to: Need surrounds to go with TD15M but 10" #51441

    Hello, The best option to match with the TD15M will likely be the TD10M. However, this won’t get you the 80hz sealed. If that is the biggest determining factor, the TD10S will be the one to go with. It should get close to 80hz.

    Best Regards,
    John


    Keymaster
    john@aespeakers.com on · in reply to: AE LO15 vs. Dipole Push Pull or UB151 #51433

    Hello,

    1) The LO15 is going to be the most ideal to go up to 800hz. If you are only going down to 80hz then it is ideal. It is more efficient and has smoother upper extension.

    2) Placemet along the side wall is a good thing. It eliminates the side wall reflection completely. It also smooths the bump in the baffle response as the side against the wall appears infinitely large while the other side still appears as an open baffle.

    3) We can still make the UB151. These range around $1500 for a completed unit with driver, depending on the finish chosen. They are very difficult to assemble with the rounded corners. They take a lot of filling and detailed cuts because the tolerances on the corners are not good. Making a simple rectangular U baffle from MDF would provide the same results though.

    4) If you did do one firing back and forward, I would align the base of the cone where it meets with the coil. If you want perfect time alignment it is a good idea to measure the impulse response. Depending on listening distance/height you would need to make some minor adjustment.

    5)If you used an angle, that will greatly affect the upper end response. At 45 degrees off axis, the response will drop quite a bit before 800hz.

    Regarding the other question, yes, a 2.5way is the best option. Both woofers would play up to about 250hz but only the top one would continue up to 800hz. You can either do this actively, or put a 1st or 2nd order lowpass on the bottom driver to roll it off about 250hz. This does however add in a bit of delay, although at this frequency it isn’t much of an issue.

    Best Regards,
    John


    Keymaster
    john@aespeakers.com on · in reply to: TD6M #51432

    Hi Donc, I do have parameters and response curves. If you want to email us I am happy to send them to you. We have been selling some recently. I have not yet had time to get good pictures taken and edited to get them on the website though.

    Best Regards,
    John


    Keymaster
    john@aespeakers.com on · in reply to: I have (4) PR15-700 #51398

    We do not have any specific plans for something using the at the moment. A pair of PR15-700 would work very well in 3 cubic foot with a single TD12H though. This would be a great music subwoofer, quite efficient that would extend to around 25hz. If you wanted to do a single subwoofer, you could use 2x TD12H in a 6cf enclosure. Two woofers on the front and two PR’s on each side.


    Keymaster
    john@aespeakers.com on · in reply to: Project with SBP15 and TD6: Which Tweeter? #51380

    Hi Sascha, Unfortunately our forum doesn’t get a large amount of traffic. I would expect 300hz and 3000hz xover points to work well. I sent you contact info for Bo at SB Acoustics. You may be able to contact him for some arrangements on a sample to evaluate.

    Also there is some information on the Hiquiphon here by Jeff Bagby. I will contact him and see if he has any additional thoughts.

    http://www.ellisaudio.com/hiqcomments.htm


    Keymaster
    john@aespeakers.com on · in reply to: ob for line array #51365

    Hello Brian,

    Hoping you received the email replies we sent you in regards to this as well. If you did not, please check your spam folder. We do not make an OB15 or OB18 but do have the Dipole15 and Dipole18. Both have linear Bl out to 15mm each way. You could get very good output with either option.

    We currently have a 8pcs of the Dipole15-D16 available for immediate shipment. We also have 6pcs of the Dipole18-D8 available. I don’t expect either to last long.

    The Dipole15-D16 have the 10mm rear mounting hole tapped in back to bolt the motor to a support. I would use 4 per channel with coils in series for 32ohm per woofer. Then all 4 in parallel for 8ohm overall. I would say the 8pcs Dipole15 is the preferred option. This gives closer center to center distance and also a slightly longer line.

    With the Dipole18-D8 I would wire coils in series for 16ohm. Then the 3 woofers in parallel for 5.66ohm overall.

    This would be a similar approach to what Soulsonic does. Or the Ronald Wanders system. Using the larger drivers though you will get significantly more low end than they do with the 12’s.

    http://www.soulsonicspeakers.com/impulse_se.html

    Ronald Wanders Open Baffle with Dipole12’s and DIY ribbons

    Best Regards,
    John


    Keymaster
    john@aespeakers.com on · in reply to: 2-way using Dipole15 and horn compression drivers #51363

    I understand now. Yes, this could work well. With having 2 Dipole15 next to each other horizontally you would want to make sure to cross one of them lower. Otherwise you will have cancellations between them. You could actually do this passively by putting an inductor on one woofer on each channel. This creates a slight bit of delay as well. I would run each outside woofer all the way up to the crossover to the horn. Then the inside woofers could get cut about 200hz. This would put a slight bit of delay on the inside 2 which would work well with the listening position in the middle. Your amp with 2 channel crossover then would work simply as a 2way.


    Keymaster
    john@aespeakers.com on · in reply to: Pro Audio Use #51362

    Hello, We have had many people use our TD woofers in live sound applications. Specifically the TDM series. They are a pro-style midbass driver with good high end extension. A pair of TD10M would get you levels that should fill any needs for the wedding applications. You could get great results in an MTM with 2x TD10M and an AMT like the Beyma TPL150 or a horn/compression driver. The Faital HF108 with their LTH102 would be a great option.

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