Group-buy-2019-dreadnought-avel-lindberg-1000va-isolation-transformers

This thread needs more ****:





Edit: Apparently I need to get more creative in my misspelling of the word "pa-horn"

Nerds spell it: pron...

Nice to see yet another group buy moving forward. For anyone on the fence about it this is a major step forward for these fine old speakers.
I consider my dreadnaught and Larry's case from the last group buy quite possibly my best upgrade ever for my 1.2tl's. The removal of ground noise that I didn't know was there is noticeable from the very second the dreadnaught is plugged in.

In case there are folks who are new to the Dreadnought and would like to investigate in advance of joining @pitdogg2's 2019 Group Buy, here is some info:

PURPOSE
The purpose of the group is to purchase at a discount the Avel Lindberg 1000VA isolation transformer for use in the AI-1 Dreadnought developed by @DarqueKnight which greatly improves the sound quality that is possible from Polk's SDA speakers. See DarqueKnight's upgrade thread for details.

ORDERING
Cost is TBD, based on the soon-to-be-received quote and participation level. Historically, there are price breaks beyond the 10-unit minimum at 15, 20, 25, and 30. The quote at 10ea in 2016 was $292.88 plus $17.55 shipping & insurance. A-L will provide quotes for any shipping outside the CONUS.

Once the group buy goal is reached, full payments are collected from members. Once all payments are collected, the order is placed and payment made. Lead time has historically been quoted at 12 weeks which allows plenty of time for members to purchase cases and parts. Units are shipped directly to members via USPS Priority Mail. Packing is adequate but not luxurious.

DESIGN & ASSEMBLY INFO
Assembly is very easy and straightforward, and the end product is extremely rewarding.
Toolfan's 2017 Cases
F1's Neutrik Design
Parts Lists & Discussion (2016 GB p.10)
Bolt & Faston info + agfrost's use of slightly different Neutrik's
F1nut's outriggers and spikes

BINDING POST CONNECTIONS
DarqueKnight's original Dreadnought. Note this is using the 800VA, but the 1000VA is the same scheme.

DarqueKnight wrote: »

Right Pin = Red/Yellow
Right Blade (Negative Speaker Terminal) = Black/Orange
Left Pin = Grey/Brown
Left Blade (Negative Speaker Terminal) = Blue/Violet

NEUTRIK CONNECTIONS
F1nut's Neutrik Dreadnought (link above). I believe this arrangement is consistent with Larry's latest batch of cases. For same-side Neutriks with 90deg connectors, see below.

F1nut wrote: »

Red/Yellow (right pin) to 1+
Black/Orange (right blade) to 1-
Grey/Brown (left pin) to 1+
Blue/Violet (left blade) to 1-

@agfrost's Neutrik set (with spare direct interconnect cable) Note: Neutrik also makes a male-to-male lockable coupler that could be used with existing Dreadnought cables to bypass the Dreadnought.

@stainless0steel2's Same-side 90deg Neutrik design


DYNAMAT
DarqueKnight's Dynamatted base

F1nut's Dynamtted top


DARQUEKNIGHT'S DREADNOUGHT DEVELOPMENT
1000VA Upgrade (2012)
Original 800VA Dreadnought (2008)

PREVIOUS GROUP BUYS
2016 Group Buy
2014 Group Buy
2012 Group Buy

So with @daddyjt joining that makes it 14 official

Yes that is correct. The dreadnought is a larger isolation transformer which is placed inline in the crossfieed cable that connects Polk SDA loudspeakers to one another. The RTA’s are predecessors to the SDA’s and do not have a crossfeed cable connecting them like the SD’A’s do. So the dreadnought has no place to go.

I bought two 1000VA transformers on the last buy. I sold one of them and am using one currently. I sort of regret selling that second one. I would be in for buying another if the price is low enough (enough people). Count me in on the "possible" group. I hope this works out for everyone that does not have one currently.

@westmassguy Dave, should have realized you would have suggested it.

@pitdogg2 You are correct in the possible eventuality of acquiring a larger pin/blade model should one become available up here. Don't know about selling it later if not needed with shipping to/from AK being prohibitive for many things, but......... Keep me in as a 'possible' please. Has a 'critical point of no return' date to decide been chosen yet?

erniejade wrote: »

On the top of the page, there is a star. Click on it and it should change colors. That means you are subscribed to the thread.

Duh..... somehow missed that.
Thanks.