Is it better choice to have two 5 inch woofer with 8 ohm in parallel in sealed box or one 7.5 inch 4ohm woofer in sealed box? Mid tweeter will be SB SB65WBAC25 or Alpair 5. Crossover point will be around 400 Hz.
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I call 7.5" still a small woofer actually.
But it all depends on what woofer and their specs. In general, a bigger woofer often works better than a few smaller ones in one cabinet. But with two woofers you could do an MTM setup, which also has it advantages. But those are just general assumptions, it all depends on what drivers in what kind of cabinet.
But it all depends on what woofer and their specs. In general, a bigger woofer often works better than a few smaller ones in one cabinet. But with two woofers you could do an MTM setup, which also has it advantages. But those are just general assumptions, it all depends on what drivers in what kind of cabinet.
I did a FAST with the SB65 and four 5.25in woofers in a Trynergy type speaker. It had good bass and a good match after baffle step fall off to match the 82dB sensitive SB65.
Presenting the Trynergy - a full range tractrix synergy.
I don’t think two 5in are enough. I would go with a single 8in. Here is a XO for an 8in 4ohm woofer. You can replace the 8ohm full range with a 4ohm by using a bigger cap:
Presenting the Trynergy - a full range tractrix synergy.
I don’t think two 5in are enough. I would go with a single 8in. Here is a XO for an 8in 4ohm woofer. You can replace the 8ohm full range with a 4ohm by using a bigger cap:
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But with smaller woofers 1st order crossover work better than with 8 inch. Also preferred low mass membrane woofer.
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For a 400Hz crossover the MW19 is prety much perfect, but even the (much) cheaper plastic frame (PFC series) work pretty well. I have the SB20PFC in a small sealed box crossing to an L.Cao F6 and it is 'fast' enough for what I need it to do.
F6 Lii Audio is tapered box, sealed box or OB. I have tested PFC 6 inch woofer with Satori 6 inch but Satori is night and day compare with PFC.
We did just such an experiment going from a single 7” (SDX7) to a pair of Silver Flute W14 going from Tysen V1 to Tysen V2.
2 woofers push-push worked much better than the the single woofer. More extended top made the blending easier, and that 4 W14 can be had for what a single SDX7 cost does not hurt. As well they can be had at 4, 8, or 16 ohms to give lots of juggle room for sensitivity if attempting a passive XO. In its ML-TL it reaches 35 Hx (F10) with no boundary support.
One of the reasons is the active force cancelation that push-push brings. Not to mention, mounted on the side have no transition from 2π to 4π radiation.
I have not heard the SB, the Alpair is superb.
dave
2 of our other WAW are MTM (and given XO less than the quarter wavelength at the XO, a proper MTM without lobing), and one is TMM. And another, the one i am listening to now has push-push woofer support (A5.2eN in µMar-KenSET up top). 2 x 4” Peerless 830870 per side. Twice as pricey as the SF (at least this side of the pond), same extension, taller ML-TL.
I have another push-push woofer that just needs the drivers installed, it should be a versatile support for a wide range of small satelites
My subwoofers are push-push, i have an addiitonal set of push-push helpers downstairs with no top that can go to a new home.
I am decidely a fan of 2 small over 1 large.
dave
So your experience with two side mounted 51/2 inch woofer is better sounding than one 7inch woofer. Did you use sealed box design?
Due to the typically higher frequency extention capability. The helper woofer swe have used (in decreasing order) reach about 10k, 5k, 4k, 4k, 1.7k.
The 10k ones are best (and more or less tied at biggest at 6.5).
dave
Yes. The boxes were suited to the driver. Th e7” worked well sealed (a rare occurance these days) the W14 were in an ML-TL. Our other bass helpers have been ML-TL or more exotic reflex enclosures.
dave
Just a quick FWIW that I've paired an SB65 with a Kartesian Sub120. Excellent results, from a really small box. Only down-side is the Sub120 needed around 5R in series with the SB65 to get the overall balance - overall sensitivity is low.
2x Sub120 in a W/FR/W format would improve sensitivity, and make it acoustically coaxial.
Chris
2x Sub120 in a W/FR/W format would improve sensitivity, and make it acoustically coaxial.
Chris
Chris. What is the crossover point from Sub120 and SB65.
I am also thinking about two 5 inch SBacoustic CAC 8 ohm in parallel.