Another Project on the Way Slim Floor Standers (M T M)

[sadik]

After Completion of Book-shelf's & Multimedia Speakers, I have started working on my new Project. This new Project will be a Sleek Floor Standers.

I wanted the Enclosure to be Sleek & Height no more than 1 mtr, there was no constrain related to Depth of Enclosure. So I designed the enclosure accordingly. The Dimensions of Enclosure are [900 mm (H) x 180 mm (W) x 350 mm (Deep)]. The calculated Fb is 47.37 Hz & F3 is 40.82 hz, The Port Size will be 4 Inner Dia.

The Woofer which I have used are the same as used in book-shelf's (my earlier project) & Highs are Ribbon Tweeters.

The Specifications of Woofer are as under
Make: Iwai
Output Power: 50 Watts
Impedance: 8 Ohms (Total Impedance 4 Ohms 2 Nos Wired in Parallel)
F(s): 63 hz
Size: 5.1/4
Quantity Per Enclosure: 2 Nos.


The Specifications of Tweeter are as under
Make: Audiopur Ribbon Tweeter RBNT1
Output Power: 15 Watts
Impedance: 4 Ohms
F(s): 1.5 khz to 33 khz
Quantity per Enclosure: 1 No.

I also wanted the Enclosure to be light weight hence I selected 12 mm MDF with a Strong Bracing Inside.

A Little Teaser :

Regards,
Sadik Bhatkar

 

[SanjeevM]

Excellent project, Sadik Ji. [clapping]

The floor standers are badly needed in a true audiophile's setup.

Did you consider going for large size drivers for mid and lows? My first speaker set had a 24 x 12 x 10in cabinet, with 8 inch full-range Philips HiQ speakers. I miss the 'presence' of that sound today. Maybe my belief is wrong, but I would use large drivers as their sound appears 'warm' to me.

 

[manniraj]

Great going Sadik and best of the luck for the build. Have a look at this kit which is supposed to be one of the best kits sold by parts express for being VFM and sounding outstanding.

https://www.parts-express.com/tritrix-mtm-tl-speaker-components-and-cabinet-kit-pair--300-702

Thanks

 

[sadik]

Excellent project, Sadik Ji. [clapping]

The floor standers are badly needed in a true audiophile's setup.

Did you consider going for large size drivers for mid and lows? My first speaker set had a 24 x 12 x 10in cabinet, with 8 inch full-range Philips HiQ speakers. I miss the 'presence' of that sound today. Maybe my belief is wrong, but I would use large drivers as their sound appears 'warm' to me.

I Already Have Floor Standers which was made earlier by me by using Car Audio Speakers. This will be my second set of Floor Standers.

May be after some more projects i will put my hands on large drivers. But for now Enjoy this built process.

Updates :

CNC Cutting Finished & Assembly Started

The Rings will be Extra Support behind the Flushing Area of Drivers, Speaker Terminals & Vents.

Sadik Bhatkar

 

[sadik]

Some more updates regarding Assembly:

Assembly of Inside Bracing.

In the below Image you can see the small pieces of woods placed on the sides walls. These small pieces of woods are temporarily fitted on the side walls with the help of nails to keep the Braces on its place during fitment. It will prevent the braces from moving during final fitment. (These small wooden pieces will be removed once the Braces are fitted on its place)

Top Assembly is Completed & In Bottom 1 Baffle is pending.

Assembly of the Extra support below Driver Speakers, Speaker Terminals & Vent.

Assembly of Front, Back & Side with Braces Fitted. In this Photos the small wooden pieces which were temporarily fitted for braces fitment are removed.

I have taken a good care to match all the corners in perfect 90 Degree angle & More care should be taken when fitting Bottom & Top Pieces. They should be at perfect 90 Degree with the Sides, Front & Back Pannels, or else you may end up your towers looking like "Leaning Tower of Pisa"

Sadik

 

[keith_correa]

Your listening height must be really low. 900 mm is relatively puny for a floorstander.

 

[sadik]

Your listening height must be really low. 900 mm is relatively puny for a floorstander.

I Don't think it will be a Problem, The listening distance is around 10 to 12 Feet from the speakers. I have limitations so cannot increase the height.

I would still want to know for my knowledge, what will be effects of such low height for floor standers.

Sadik

 

[Hiten]

You can use wedges to bring drivers in vertical alignment to your sitting position.

How much does this CNC cutting job cost ? I presume they charge by time.

regards.

 

[sadik]

....how much does this CNC cutting job cost ? I presume they charge by time.
regards.

The CNC machine owner is actually my friend so he didn't charge me heavily.
Along with the MDF Sheet (Marine Grade 12mm) I Paid Rs. 2,700/- in total, The Cost of MDF Sheet was alone Rs. 1,700/-. In Actual Market the Cost may be on very higher side with compared to the work done in my case.

Sadik

 

[keith_correa]

I Don't think it will be a Problem, The listening distance is around 10 to 12 Feet from the speakers. I have limitations so cannot increase the height.

I would still want to know for my knowledge, what will be effects of such low height for floor standers.
Sadik

Typically, while listening, your ears need to be at the same height as the tweeter otherwise you will be listening off-axis. That's not a issue per se provided you know how the response is going to be off-axis and that response is desirable. I was referring to the vertical plane and not the horizontal plane.

 

[sadik]

Some More Updates. Yesterday I had completed the assembly of Sides, Front, Back & Internal Baffles. Below are the Photos of same.

Today I have Done the Trimming of Extra MDF on sides of Enclosure & Assembled the Top & Bottom Pieces. I have not yet taken the photos of same. I will upload them tomorrow.

Sadik

 

[Tmr_suresh]

highly professional build. it seems you can start a speaker company. my best wishes.

Regards,
R.Suresh.

 

[sadik]

highly professional build. it seems you can start a speaker company. my best wishes.

Regards,
R.Suresh.

Thank you for your complement. I have planned that after my retirements.... lol:lol:

 

[all4music]

looks superb Sadik! can't wait to see finished product!

 

[rajesh srinivas]

very well done sadik,
few clarifications.

1. I see you have used nails 4in spacing to join the panels,i feel half threaded screws are far better then nails to hold the panels air tight,what glue you have used.
2. do you intend to add damping material inside.
3.what about rounding the front baffle edges to reduce/eliminate diffraction.

thanks
rajesh

 

[sadik]

very well done sadik,
few clarifications.

1. I see you have used nails 4in spacing to join the panels,i feel half threaded screws are far better then nails to hold the panels air tight,what glue you have used.
2. do you intend to add damping material inside.
3.what about rounding the front baffle edges to reduce/eliminate diffraction.

thanks
rajesh

1. Yes Screws are Better option compared to nails, In my case the mdf thickness is just 12 mm so i have used nails spaced at 2.5 inch. Nails are just an support to keep the piece on its place Bonding work is done by the glue. I have used "Fevicol SH" to bond the pieces together.

2. I will be using a very low density foam just behind the Drivers. I will not dampen the whole enclosure.

3. I think I should search about your 3 point on internet & study about it.

Sadik

 

[sadik]

Today's Update.

The Enclosures are now completely assembled. Putty has been applied to hide the nails & Complete Enclosure is now sanded for applying NC Putty. (However after complete sanding I did not clicked the Photos) I will spray the NC based putty as usual to apply even coat on all the sides & after that again sanding with Fine grit paper. (Very Hard Task)

The Surface in front Photo is completely sanded, where as in the back it is pending

The Edge Finish

This is how it looks after sanding off the Excess putty used to hide nails

I Spend the whole day applying Putty to hide nails & Sanding it. Its really a Very Hard Job. But the Fruits are very very sweet.

Sadik

 

[Hiten]

Looking good
Regards.

 

[rajesh srinivas]

hi sadik.

Nice finish,you have mastered the art of making boxes..

Just will explain you the advantages of front baffle edge rounding or 45 deg chamfering.

When sound travels from the speakers esp..tweeter and midrange drivers (directional sound) they tend to get scatered in all directions,and since the edges on front baffle are sharp the waves tend to get reflected from them and get mixed up from the direct waves coming towards the listener,which results in colouring of the original waves that we should normally listen to...

This process is called diffraction and we must avoid to get clear original sound,this case is not applicable to sub freq (omni-directional),Since the bass frequencies have longer wavelengths, they will spread out more than the high frequencies.

Just my few cent,But can assure you the above will improve your listening.

One clarification.

How do you fix your panels (front,back,side and bracing)
,i.e is bracing assembly is fixed to the side panels first,or to the front and back panels..??/

Thanks
r/s.

 

[SanjayM]

Brilliant work Sadik:clapping: