comparing J2 and M2

[Milkduds]

I've got a factory made J2 in my system doing some fun comparisons with a M2 I built from help here. The first thing very surprising is a big difference in gain. The M2 has way more gain and this seems inconsistent with what I read at Nelson's First Watt page. Am I missing something here? The J2 needs more gain than my 6.7 dB transformer coupled tube linestage can deliver. The M2 OTOH has room to spare.

I'll share some amateurish thoughts on differences in sound for my rig later for those who are interested.

Jim

 

[Milkduds]

I think I may have figured out my problem. When in doubt READ the manual! I see there is a jumper that needs to be installed between pins 1 and 3 of the XLR if using the unbalanced inputs. Am I on the right path here?

Jim

 

[Zen Mod]

yup

bummer without jumper , when using RCA in

 

[Milkduds]

Thanks ZM. Wish I had deleted this post!

 

[Zen Mod]

why ?

this way you can save some other newbie ......

if I had a dime for my every ookup with connections .......

 

[zman01]

Milkduds,

Look forward to more listening impressions. What speakers are you using?

And btw, lucky you - both J2 and M2 in da house!

 

[2 picoDumbs]

Now get back to doing that comparison

 

[Zen Mod]

J2 and M2 are for Sissies

 

[Milkduds]

Look forward to more listening impressions. What speakers are you using?

My speakers are very high efficiency horns which is probably why I like the M2 so much. Mid-range is Edgar wood salad bowl with JBL 2441 compression drivers (500 hz and up), Mid-bass is front loaded straight horn (68 to 500 hz) using Great Plains 15" woofer, Subs are 7 ft tall diy tapped horns with Definimax 4012HO drivers. Subs are driven by pro Peavey amp and Welbourne active xover at around 60 hz. FW amps drive the mid-range and mid-bass, passive xovers. I also have the fancy Fostex magnesium tweeters but they are sitting disconnected at the moment. All in all big huge dynamics that can fill up a room so they work better in bigger rooms.

Sissy

 

[grimberg]

Is there a Babbelfish J2?
I think it is time you publish "The Hitchhiker's Guide to Zen Mod's Creations".

 

[Milkduds]

Pic of my horns. I built the mid bass and tapped horns from sims that John Hasquin did for me.

 

[Zen Mod]

naah

not good

pic is too small and it's just one



ZM, Master Sissy


(there is Babelfish J2 , but J2 is still in production )

 

[zman01]

Pic of my horns. I built the mid bass and tapped horns from sims that John Hasquin did for me.

Cool setup Milkduds! Listening to Motorhead now, wondering how that might sound through the horns...

 

[kbergsson]

Cool setup Milkduds! Listening to Motorhead now, wondering how that might sound through the horns...

Loud

 

[zman01]

Loud