Dipoles with a Direct twist

[Skoda]

Hello JBL fans

As they say I'am on a misson... I have some desing ideas and were I want to go with this but I feel I need some insight on what to do for some maters (aka the do's and dont's of DIY dipoles with a direct mode )

Design Goals:-Have a footprint no bigger then 23''(H)x14''(w)7"(D)
-Meet the requirments for a THX certified dipole speaker
-Timber match my current system
-Amazing performce in not only performence in Ht but in DVD
Audio as well
-Be switchable from cinema mode to music remotely

Current system:-Pioneer VSX84TSX
-JBL HT4H (center)
-JBL HT4V (fronts)
-JBL E10's (to be replaced with this spectacular project
, SR )
-JBL Tour (to be replaced by HT4V, SRB)

Drivers:-332241-001 (mid)
-336347-001 (tweeter)
-.......?........(woofer)
Horn:-Bi-Raidal 336363-001 (for tweeter)

As you can read its quite the misson but I got some snags... I dont have the white paper or datasheet not sure witch you call it So there for I need some generious member to provide some info, please or I'll not be able to work out the tunning box freq and tweeter horn configuration.

For the low frequency driver I'am not sure what to use I had some Ideas of using some venue or possibly even an extra 332241-001 driver?

I'am also not sure if it would be wise to use 2xHT5 X-over's and wire them out of phase, or DIY it also

any inquiries, thoughts or pms are most certainly welcome

Skoda

[Skoda]

been making some progress with the project

I have recently ordered the 6 horns to make the image come true. I'am aiming for a 3way dipole speaker and switchable into bipole mode plus direct. the idea came from the S4A from the synthesis line.

The horn can be seen below.

[Skoda]

I have made a rough sketch of what the design goal is but not 100% sure the mid rang drivers should be placed, some what higher then the LF woofer,(still havent found a sutable driver yet but progress is being made) the mid range driver is coming from the HT line as well and wil be crossed over at 2.5khz as for as for the LF I was thinking 300hz, but havent seen any dipole speakers x-over at this frequincy, can some one elaborate on this?

woofer below

[Skoda]

I was planing on using the cross overs from the HT5 for the mid and HF and using a saperate passive x-over for the LF basicly Biamping. (block diagram below)

I've been looking at tech sheets for some time now and found that the performance series 8" driver looks well suited for the job along with project array ceneter channel's 8" driver. My last resort would be a GTO 8" from JBL's car audio department would any one possibly have the specs for the performance series 8"?

Best Regards
Skoda

[mikebake]

Sounds very ambitious, and expensive. Let us know how it turns out. Good luck.

[Skoda]

Thanks Mike, I'll keep you posted and forum members posted on my progress.

"epensive" well yes, and no. The project's expected cost is going to be around $1100-$1600 dollars CDN depending on which 8" drivers I think can get the job done. Still will be half of what it would cost for any of the synthesis line dipoles $3600CDN for a pair of S4A and almost $4000 for the S1A's.

Though i find it defficult getting any information on dipoles or even DIY dipoles... There for not many have walked the plank

Best Regards
Skoda

[Robh3606]

I am not sure as to which vintage Synthesis System you are looking at. This is the old version dipole with 2118J's. I thought about doing a switchable Dipole Monopole but never followed through. Just did regular surrounds for discrete DD/SACD and let it go at that.

http://manuals.harman.com/JBL/HOM/Te...S%201%20ts.pdf


Rob

[Skoda]

I am not sure as to which vintage Synthesis System you are looking at. This is the old version dipole with 2118J's. I thought about doing a switchable Dipole Monopole but never followed through. Just did regular surrounds for discrete DD/SACD and let it go at that.

http://manuals.harman.com/JBL/HOM/Te...S%201%20ts.pdf


Rob

Rob The S1A was the overral look I was going for sence I dont have to mount them in wall but with the S4A's features bipole,direct...etc

http://manuals.harman.com/JBL/HOM/Te...t/S4A%20ts.pdf

picked up some wood today well, really hard wood flooring A bautiful 1 inch Birch with espresso color finish. Let the glueing begin


Best Regards
Skoda

[Skoda]

heres A schematic of the polarity switch for tweeter B in monopole mode and shut off of tweeter B/C for direct mode. Took some time to figure it out, lets just say an assignment like this isn't meant for late nights


Best Regards
Skoda

[Zilch]

O.K., how about a little tutorial here:

Dipole?
Monopole?
Bipole?
Direct?

I'm clueless what this is about.

Also, what's that horn and tweeter from?

[I don't do HT.... :dont-know ]

[Skoda]

quote=Zilch;135923]O.K., how about a little tutorial here:

Dipole?
Monopole?
Bipole?
Direct?

I'm clueless what this is about.

Also, what's that horn and tweeter from?

[I don't do HT.... :dont-know ][/quote]

I'am sorry Zilch... monopole and Bipole are the same, shit...just gave me a complex, maybe?!?! they must be ok I'am 99% sure they are. Dipole is alone Dipole (not sure how far I have to go into explaining?)
and direct is of course your convensional speaker, or direct radiating some call it.

heres a link to a site that shows moving images of dipole, direct, bipole/monopole, etc. wave pattern

http://www.kettering.edu/~drussell/Demos/rad2/mdq.html

Best Regards
Skoda

[Skoda]

"Also, what's that horn and tweeter from?"

There from the HT series

http://jbl.com/home/products/series....=CA&Region=USA

I beleiever there sound span(don't know the term for it:dont-know ) is 120degrees Width and 60degrees High

Still trying to figure out the quote system here...can't be that hard

Best Regards
Skoda

[Zilch]

S4S has different crossover frequencies for Dipole, Bipole, and Direct.

Bipole is three-way, apparently.

Dipole has no tweeter, and

Direct has no woofer?

I noticed phase reversals in the cinema layouts shown in the Pro tech references, but didn't understand what was happening there.

[Zilch]

I'am sorry Zilch... monopole and Bipole are the same, shit...

Well, that sums up my difficulty.

They do that stuff purposely to keep me in the dark.

[I just KNOW it.... ]

[Skoda]

"direct has no woofer" correct it doesn't it's 2way from what you see but I've been having problems with finiding driver's with the specs to work out box peramiteurs, and if they did...too big a volume or port(s)

up till now I have not found a 8" driver that can have a 1k cross over, with the specs need to work out the box volumes.

"Dipole has not tweeter" I'am sure there is then why would the design incorperate 2 tweeters in a "dippersion box" (thats what I call it)

"I noticed phase reversals in the cinema layouts shown in the Pro tech references, but didn't understand what was happening there." Not sure what you were looking at but if your referring to the synthesis line S1A, S2A I know what your talking about, personaly I think its a mistake because the spec sheet states the FR:100hz-17Khz