Daydreaming again

[AllenB]

Hmmm, it got me thinking as people are talking about the bass. The reproduction drivers are $50 (yeah postage could be the killer though) and we could use any horn/s we wanted. Could do one of these for my son-in-law, he is into this kind of bass.

[dave_gerecke]

Hello Moondog, AllenB, et al in Oz' perhaps if there were enough of you, you could order a rather large quantity of the drivers and have them delivered to one chaps abode. That way you could possibly exploit the value of bulk shipping. Then you can ship them around the continent as needed. And if you bought a few extra, you could sell them to other needy beggars down under!

Peace,

Dave

[Moondog55]

SWMBO says "NO!!!"

But I am very tempted, very

[Johno]

I would buy a pair if we collaborate the freight cost down.

[dirkwright]

Originally Posted by dave_gerecke

Hello Moondog, AllenB, et al in Oz' perhaps if there were enough of you, you could order a rather large quantity of the drivers and have them delivered to one chaps abode. That way you could possibly exploit the value of bulk shipping. Then you can ship them around the continent as needed. And if you bought a few extra, you could sell them to other needy beggars down under!

Peace,

Dave

It also might be cheaper to have them sent to an American first, then have that American ship them to OZ as cheaply as possible... (rowboat?)...

[GM]

Originally Posted by Moondog55

A big mid-bass peak or did they truly rumble and thunder as I remember??

Both, it has a mid bass hump due to its high inductance and a box tuned to extend it down to ~ 40 Hz which in-room with a bit boundary gain typically meant covering everything on vinyl/tape back then except for a few specialty RTR tapes. Its high Vas to keep efficiency acceptable also allows it to play at low power/SPL without any loudness control, hence its 'effortless' presentation.

FWIW, I tried several different vented alignments based on various touted design routines of the day with ~9.46 ft^3 MLTL tuned to ~16 Hz being the best trade-off between size/gain BW in-room, but overall, putting it in a heavy, well constructed 4-5 ft^3 sealed cab is the way to go IMO except for serious HT sub duty and even then I'd probably just add more of the same spread around the room.

Anyway, it's the second best consumer bang/buck driver I've used with the RS 18" 40-1309 being numero uno.

GM

[Moondog55]

Thanx GM You are truly a font of knowledge and wisdom
In its current iteration which driver performs better, the 4R or the 8R; in your opinion??

I would have trouble getting any more subs into the room but there is an ongoing project by another member who is on the hunt for the perfect .5 subwoofer for a 3.5 box

[GM]

You're welcome! Well, when you've been dinking around with audio as long as I have, some of it was bound to 'stick'.............

Being ‘old school’, I prefer a higher impedance to keep current, inductance as low as practical which in turn of course lowers any thermal power compression issues, minimizes wire, electronic components, etc. size requirements and maximizes usable BW. Note that my remarks were based on my experience with the original 8 ohm driver, I don’t recall there being a 4 ohm variant.

Looking at these driver’s published specs though, to the first approximation, the 4 ohm with its super high inductance would be strictly for ‘sub’ duty and the cab should be designed based on its heated up specs to keep thermal power distortion at a reasonable level and neither is even remotely suitable for your friend’s app due to their low excursion capability and need for a L-R transform ckt.. Really, at this price, a damped [4] driver OB array placed near a corner or at least a two boundary junction might be the ‘hot ticket’ for an inexpensive high SQ music ‘sub’ as gainphile alluded to.

WRT a 'perfect' 0.5 in a minimally damped 3.5 ft^3 net sealed, to my way of thinking this would theoretically require a ~20 Hz Fs/0.312 Qts/5.46 ft^3 Vas/400 W [peak]/1.5" Xmax [min. based on a single 15"], though no clue if such is available or at least close enough once specs are 'juggled' to arrive at the same net Vb and/or desired low corner and/or desired peak SPL at 'X' frequency or range of frequencies, i.e. too vague a description to 'ballpark' the needs of his app once HT movie soundtracks and pipe organ symphonies are removed from the 'mix'.

GM

[Moondog55]

Well then maybe he needs to blank off the hole and use a 12 then, or even a 10inch; but between us we have been playing with his build for about 3 years now LOL
None of my 15inch drivers come close to your "Ideal" 15
Building speakers remotely is a fascinating exercise in theory and frustration