Thank you Paul and Vladimir. You both raise crucial points and ideas which further lead me to the following conclusions-
1. In order to achieve the true bass sound , larger reeds must be used . Based upon sketches of the Jupiter metal bass reed plate ( sent to me today by- Harmonikas.cz) and Sergey Semanov ( bayan repair man - in Lancaster, PA, USA) the reed length of the lowest bass note ( E1) should be close to 9 mm high. My current Dallape -lowest bass note - C2 has a height of 6.4 mm.
2. Having all bass reeds riveted onto one metallic bass plate-as opposed to single ( one reed per bass note) reeds - waxed into a wooden reed block should yiels more resonance , richer overtones and louder volume.
I have a few ways to go-
1. I have ordered 2 bayans from Ukraine ( via Ebay) and in a few weeks, when they arrive I will look inside and see if I can use the big bass reed block or possibly the individual bass reeds . Problem- My dallape bass reed block starts ( from Left) with C2( lowest bass note) and moves to the right ( as the notes become sharper-C#2 etc) and the reeds become smaller. The Russian bayan bass reed block also starts on the left and gradually decreased reed height as you move to the right EXCEPT that the bayan Left-most note is E1. Therefore I can not simply "transplant" the bayan bass reed block into my Dallape. I may need to build a new bass reed block ( definitely taller ) so that the Left-most bass note is still C ( in order for my Dallape basses to work properly -otherwise -I will be playing a C bass note but hearing an -E note !!)
2. I will have to extend the Dallape bellow height, somehow- to accomodate the taller new reed block.
3. Another option- buy a "complete" Russian bayan left side. Zenano Accordion has a YasnayaYasnaya onto the Dallape. An iteresting "mixed marrige" of Russian/ Italian nature with an adptor as a "marrige -match-maker". I have written the owner Novikov about my idea. He has not yet answered. He may never answer, if he think That I am crazy enough.
Just as abackground , since Vladimir mentioned the context of usage of the "Deep bayn type bass" which he called 'monumental" ( I can not stop smiling !).
Anyway, over 60 years ago a Ukranian folk group called "The Chorus of the Volga" recorded a wonderful song called 'In our Kuybishev". I was still a teen-ager , living in Israel , when it played on the radio. It became an instant hit ( they still sing it there- now with Hebrew words). Shortly, when we immigrated to USA , I found the whole album. I cherish it till today. On that album I first heard the bayan. The deep bass sounded nothing like the 80 bass Scandalli and Paolo Soprani that we used in Israel. I always wonedred how that bass was produced. I am resolved on getting it now.
I can not attach mp3 songs here from that album, where you can hear the "monumental' bass sound I am after.
I can send them to you if I have your email , Vladimir. Paul, are you also interested?
In conclusion-
I can not say it enough- Please shoot me any ideas, reactions , suggestions etc.
They are all welcome !