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Rogers AB3a clone for the ls3/5a

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  • Rogers AB3a clone for the ls3/5a

    Rogers AB3a clone for the ls3/5a

    Hi! Got a vintage Rogers LS3/5a in transit, I’ve heard this speaker before and they have excellent mids but are lacking in the critical 60-80hz bass region for kick drums.

    Came across the Rogers Ab3 and I don’t think the price tag is justified ($4000++ WTF).

    I do like the idea of of a bass unit that can also serve as the stand of the LS3/5a since my space is quite limited but due to the size of the driver it can accommodate it would be a stretch to call it a subwoofer. That is okay though since I would just like to hear a proper kick drum and don’t feel the need for subterranean lows nor high spl since the Rogers are not amenable to being driven to deafening levels.

    So. How do we clone the AB3a? Do I wire the woofers in Parallel or Series?

    Seems doable as I plan to make a passive version with and just have a minidsp and a Plinius SS amp to drive them. I can probably track the B110 woofers via ebay and have a carpenter build out the sealed cabinets.

    But it says on the Rogers site that it’s a “special” doped version of the b110 woofer (doubt it) to give it bass.

    So my question is: with the AB3a dimensions (H 23.62” x W7.48” x D6.5”) would I be better off just using a more modern woofer in a sealed enclosure or should I just stick to using two pairs of B110 woofers like the ab3a.

    Any driver or build suggestions? Would want to maintain the dimensions for aesthetics and space and the thin wall sealed construction of the AB3a


    PS: Also aware that the plans for the AB1 passive (the ported one woofer predecessor of the AB3a) are floating in the internet and that is also an option, but I think I will have better luck with a sealed implementation to integrate it better to the LS3/5a for when I want to listen to rock music.​

  • #2
    The late Jeff Bagby designed a clone of the generic BBC monitor, the Continuum. It continues as the updated Continuum II. He also designed a bass module / stand for the Continuum. Kits are available. I would suggest you research this subject. I would insert a link, but the host of this forum, Parts Express, forbids linking competing businesses.



    • #3
      Using two of the same woofers, in a sealed cabinet roughly twice the volume (the AB3a), will have the same low end as the LS3/5a's. The AB3a is under .5 cubic feet internally, which can work with some drivers. A pair of these in parallel, vented might suffice: Or just one of these in each:

      Tang Band W6-1139SIF 6-1/2" Paper Cone Subwoofer SpeakerThe Tang Band W6-1139SIF 6-1/2" subwoofer's wide half-roll surround, raised flat spider, and large 1-1/2" 4-layer voice coil ensure exceptional output and high power handling. Boasting 11.5 mm of Xmax, the W6-1139SIF is capable of producing prodigious amounts of deep, low-distortion, punchy bass. A vented pole piece and vented spider promote voice coil cooling by improving heat dissipation and reducing efficiency-robbing power compression. This 4 ohm driver also features a rugged stamped steel basket and bumped back plate.

      Tang Band W5-1138SMF 5-1/4" Paper Cone Subwoofer SpeakerAmazing bass in a compact package! The one-of-a-kind Tang Band W5-1138SMF 5-1/4" subwoofer has a generous 9.25 mm of Xmax. A wide roll surround, raised flat spider, and large 1-1/4" 4-layer voice coil ensure impressive bass performance and high power handling. The vented pole and vented spider allow good airflow around the coil to improve heat dissipation and reduce power compression. The ultimate miniature subwoofer driver!

      Dayton Audio DCS165-4 6-1/2" Classic Subwoofer 4 OhmDayton Audio's rugged DCS165-4 6-1/2" subwoofer has all of the performance-enhancing attributes you would expect from a larger high-output subwoofer. With a vented pole piece and 4 ohm, 4-layer voice coil, this driver can handle up 100 watt RMS. The non-pressed paper cone is reinforced with Kevlar to increase stiffness, which promotes linear travel through the limits of its excursion. In addition, the pole piece includes a copper cap that keeps inductance to a minimum. The DCS165-4 driver is ideal for use in small multimedia speakers, portable speakers, or even automotive systems where space is at a minimum.The Dayton Audio DCS165-4 is used in the following kits:Dayton Audio 6-1/2" Down Firing Active Mini Subwoofer Kit with 2.1 Channel AmplifierThis compact active subwoofer kit is perfect for powering a compact 2.1 channel speaker system. The Dayton Audio DCS165-4 6-1/2" subwoofer is driven with 60 watts RMS for powerful output and incredible low frequency extension. The Lepai LP210PA amplifier also has 2 x 30 watt RMS outputs to power your left and right speakers. This kit is the perfect start to building your own amazingly convenient self-contained 2.1 channel system.View KitDayton Audio 6-1/2" Down Firing Passive Mini Subwoofer KitWith an elegant compact enclosure, this 6-1/2" down-firing subwoofer kit is a great addition to any small stereo or home theater. Using a Dayton Audio DCS165-4 woofer in a vented down-firing configuration, this kit will fit low-key into any décor or under a desk to add high quality bass response and extension to your system.View kit SpecificationsQ&AReviewsManuals & Resources

      If you increase the cabinet depth that opens up options for larger woofers that may work sealed.


      • #4
        On the cheap, you could do a combo of Dayton ND140 woofers and passive radiators. On a higher budget, the new Epique 5 1/4" or 7" subs and passive radiators.