Everest dd67000

[boputnam]

New low frequency transducers. Fs is reported to be roughly 10 Hz lower.

Nice.

Can you 'splain what's going on with this LF network?

[Guido]

I haven't had time to put the networks into LEAP to show the voltage drive differences between the DD65000 and DD67000 yet, just not enough free time right now.

If we could have the EDS we could assist

[Guido]

Nice.

Can you 'splain what's going on with this LF network?

Bo, it's an 18dB low Pass.
Values would be nice though

[4313B]

If we could have the EDS we could assist

Ok. You might want to play around with them in LEAP. Rumor has it that the D66000 can be upgraded with the new 1501AL-3's without any network changes. It remains to be seen if the 1501AL-3's will become available over the counter (in Japan). Perhaps an upgrade "kit" in the same spirit as the L250 to 250Ti upgrade kit available back in the 80's.

[boputnam]

Bo, it's an 18dB low Pass.
Values would be nice though

Thanks, Guido...

I don't think it's quite that simple. The signal path is what intrigues.

Obviously simplified, but both LF don't see the same pass band - right?

Serial inductors on the "upper" LF (Gm/Wht) - it has a second HPF.
The "lower" LF (Blk/Blk) has a single HPF - looks like it's a "helper" [ (V)LF ] to the other?

That's what I would consider doing, but I don't know as much as all y'all...

[Guido]

Thanks, Guido...

I don't think it's quite that simple. The signal path is what intrigues.

Obviously simplified, but both LF don't see the same pass band - right?

For me it looks like the woofers are simply connected in parallel.

Gn - Blk and Wht - Blk

[4313B]

Can you 'splain what's going on with this LF network?

The dual tens are wired in parallel and roll off as shown in this voltage drive. They are nominal twelve ohm drivers resulting in a nominal six ohm load to the network.

I posted the values in the previous post above as requested.

[boputnam]

Gn - Blk and Wht - Blk

Got it.

[Ian Mackenzie]

Bit like them car puppy boxes that had you confused back in 2004..... Sir...puttin a oval port in a round role dang dain't right!

[boputnam]

Bit like them car puppy boxes that had you confused back in 2004..... Sir...puttin a oval port in a round role dang dain't right!

Dood - that is hilarious. I was cowering in the corner all-night, hoping you would NOT bring that up!

That schematic was SO not how my brain saw it. Glad to be back!

[Ian Mackenzie]

Dood - that is hilarious. I was cowering in the corner all-night, hoping you would NOT bring that up!

That schematic was SO not how my brain saw it. Glad to be back!

I thought the schematic was confusing "actually"

Life is sometimes about the "moment".

I mean the puchline on the last visit to SF was when Suz says ..Ian...how's the scoring going? A woman's inuition never fails.

[hlaari]

Dues anyone know the diffrents between 1501Al, 1501Al-1 and 1501Al-2?

[4313B]

Dues anyone know the diffrents between 1501Al, 1501Al-1 and 1501Al-2?

Differences to Original 1501AL design are as follows:
1) The 1501AL-1 uses a 25.4mm (1 inch) long voice coil compared to 30.48mm (1.2 inch) long voice coil on 1501AL. This change increased linear (peak-to-peak) coil excursion of the 1501AL-1 design by 50% over that of the 1501AL woofer.
2) New Nomex spider geometry with larger roll shape and softer material for more linear displacement with less restrictive motion.
3) SBR foamed rubber and new surround half-roll geometry.
4) Special stiffer paper pulp formulation with full rear cone side Aquaplas damping.
5) Stronger Dome pulp material (better resistance to damage).
6) Approximately 42% lower resonant frequency (Fs) of 19Hz compared to 27Hz of the 1501AL.

Differences to Original 1501AL design are as follows:
1) The 1501AL-2 uses a 25.4mm (1 inch) long voice coil compared to 30.48mm (1.2 inch) long voice coil on 1501AL. This change increased linear (peak-to-peak) coil excursion of the 1501AL-2 design by 50% over that of the 1501AL woofer.
2) New Nomex spider geometry with larger roll shape and softer material for more linear displacement with less restrictive motion.
3) Poly-Cotton cloth, Accordion pleated geometry surround with special adhesive damping.
4) Special 3-Layer Sandwich cone with pure paper pulp outer skins over foam injection inner core.
5) Stronger Dome pulp material (better resistance to damage).

[hlaari]

Thanks Giskard

It is strange at in the technical spec for the DD65000 (1501Al-1) dues the speaker not go as low like DD67000 and DD66000?

[4313B]

I believe the DD65000 (rubber surround) goes the deepest while the DD67000 has more impact (cloth surround). They both are nine cubic foot boxes tuned to 31.5 Hz.