Magnepan 3.7 attenuator resistors?

[Rayooo]

I was interested in getting ideas on values and types of resistors for the 3.7 mid and tweeter attenuation.

My 3.7's are roughly 7 months old now, I've been running the mid range with a jumper (not the stock Magnepan one ) and a 1 ohm Mills resistor in the tweeter spot. This has been the setup I've used since day one. I was wondering if anyone had experimented a bit and come up with different/better values. I should say I'm very happy with the speakers, but, a tweak now and then is always fun.

[Face]

Pick up a pair of Duelund resistors for a little more transparency.

[Rayooo]

Ah, very good, I'd seen those Duelund resistors recommended somewhere else and was considering giving them a try.

I see they have a standard and Cast versions, 'guess I'll just go with the Cast. expensive, but I only need 2.

Here is a vote for the duelund cast resistors. I have been using a duelund cast .6 resistor in my 3.7 tweeters (better by a wide margin to stock resistor partly because stock was dampening down too far). For jumper cables I bought the cardas GR jumpers for midrange and tweeter...better than stock - Smoothed things out almost like a resistor. But combination I am running now and like a lot is duelund .6 cast resistor (from partsxpress) in tweeters with custom Maggie jumpers from empirical design in the midrange when running CJ 350 amp (when running VAC tube amp may replace the resistor with jumper after Maggies break in).

Below is the note to me from emp designs owner - his obsessive attention to detail sold me. Super good guy to deal with. Jumpers align with fast open Maggie sound.

"Darrin,

I have indeed fabricated custom Magnepan jumpers for several customers. In order to avoid frequency-dependent phase shift due to skin depth, the jumpers are simply made of mil-spec PTFE Telfon insulated silver-plated copper wire, with the exposed ends doubled-back and tinned with silver solder.

Fortunately the Magnepan set-screws are long enough to compress the tinned ends against the opposite wall of the sockets when tightened snugly.

I recommend 18 gauge wire for the midrange jumper, and 22 gauge wire for the tweeter jumper, which insures that all phase shift is outside of each driver's effective passband.

Cost is $10 for each 4" jumper; i.e. $40 for a set of four jumpers, plus $6 for Priority Mail shipping.

Thanks for your interest in Empirical Design; just let me know if you'd like to order a set of the jumpers.

Sincerely,

Karl"

[audiot servant]

Originally Posted by dpod4

Here is a vote for the duelund cast resistors. I have been using a duelund cast .6 resistor in my 3.7 tweeters (better by a wide margin to stock resistor partly because stock was dampening down too far). For jumper cables I bought the cardas GR jumpers for midrange and tweeter...better than stock - Smoothed things out almost like a resistor. But combination I am running now and like a lot is duelund .6 cast resistor (from partsxpress) in tweeters with custom Maggie jumpers from empirical design in the midrange when running CJ 350 amp (when running VAC tube amp may replace the resistor with jumper after Maggies break in).

Below is the note to me from emp designs owner - his obsessive attention to detail sold me. Super good guy to deal with. Jumpers align with fast open Maggie sound.

"Darrin,

I have indeed fabricated custom Magnepan jumpers for several customers. In order to avoid frequency-dependent phase shift due to skin depth, the jumpers are simply made of mil-spec PTFE Telfon insulated silver-plated copper wire, with the exposed ends doubled-back and tinned with silver solder.

Fortunately the Magnepan set-screws are long enough to compress the tinned ends against the opposite wall of the sockets when tightened snugly.

I recommend 18 gauge wire for the midrange jumper, and 22 gauge wire for the tweeter jumper, which insures that all phase shift is outside of each driver's effective passband.

Cost is $10 for each 4" jumper; i.e. $40 for a set of four jumpers, plus $6 for Priority Mail shipping.

Thanks for your interest in Empirical Design; just let me know if you'd like to order a set of the jumpers.

Sincerely,

Karl"

Darrin - put in an order with Karl for a set of Empirical Design jumpers for the 3.7s.

I got a confirmation email on the 25th of December from Karl saying a set of his musical wires had been dispatched and were winging their way to me... sure he must have been wearing a big red suit at the time... what a fantastic joy he has been to deal with... many thanks for the recommendation... the Maggies look forward to getting their new jumpers - they are a christmas present just for them because they have been so very good this year.

Graham

Originally Posted by audiot servant

Darrin - put in an order with Karl for a set of Empirical Design jumpers for the 3.7s.

I got a confirmation email on the 25th of December from Karl saying a set of his musical wires had been dispatched and were winging their way to me... sure he must have been wearing a big red suit at the time... what a fantastic joy he has been to deal with... many thanks for the recommendation... the Maggies look forward to getting their new jumpers - they are a christmas present just for them because they have been so very good this year.

Graham

Congrats on the wise purchase. They beat the cardas golden reference jumpers made for Maggies. I am now running a duelund .6 cast resistor in tweeter and empirical design jumper in the midrange. Perfect for my ears. Although now that the CJ pr350 is warming up/breaking in I might try the emp designs jumper in the tweeter too. Let us know what you think when you get them!!

[audiot servant]

Originally Posted by dpod4

Congrats on the wise purchase. They beat the cardas golden reference jumpers made for Maggies. I am now running a duelund .6 cast resistor in tweeter and empirical design jumper in the midrange. Perfect for my ears. Although now that the CJ pr350 is warming up/breaking in I might try the emp designs jumper in the tweeter too. Let us know what you think when you get them!!

Have had the Empirical Design jumpers in for a week now, how can a few short pieces of wire make so much difference, mids opened right up... just where did that midrange come from... making the stock bridge seem so congested in comparison and the treble shimmers with the new jumpers... less grain, more detailed and extended... performance vs cost ratio for Karl's musical little wires is just off the chart, just $40 for a real big step up in performance for the mids and treble in particular... many thanks Karl for your fantastic wires and also for dpod for the recommendation, can I pass it on to ANY 3.7 owners... absolutely awesome

Graham

Originally Posted by audiot servant

Have had the Empirical Design jumpers in for a week now, how can a few short pieces of wire make so much difference, mids opened right up... just where did that midrange come from... making the stock bridge seem so congested in comparison and the treble shimmers with the new jumpers... less grain, more detailed and extended... performance vs cost ratio for Karl's musical little wires is just off the chart, just $40 for a real big step up in performance for the mids and treble in particular... many thanks dpod for the recommendation, can I pass it on to ANY 3.7 owners... absolutely awesome

Graham

Glad they are working out for you, Graham. I like your description esp of midrange opening up. Makes me want to buy some other empirical design stuff.

[Rayooo]

Thanks Much!

I've got a couple 1R0 Duelund's on order.
May give a shot at different different jumpers for midrange, currently using Cardas.

I could not find the duelunds on PartsXpress..? went with partsconnexion.

Originally Posted by Rayooo

Thanks Much!

I've got a couple 1R0 Duelund's on order.
May give a shot at different different jumpers for midrange, currently using Cardas.

I could not find the duelunds on PartsXpress..? went with partsconnexion.

Sorry yes parts connexion in canada