Vifa RB2 kit meets mini transmission line

ShinAce

Can we get a pic of the back of the assembled box? Or am I just being greedy?

ben62670

GV#27 wrote: »

... As for the PR they are great for subwoofers and bigger systems but we are talking about a 5" woofer in a mini monitor form factor and a first time build so IMO not practical.If bass extension is the priority then just build the ported option.Adjusting port lengths will give you the same tunability as a PR but you will have the very desirable benifit of being able to predict the resulting response with free software like WinISD

Hey Ben long time no talky how are things?Is that Burr Brown DAC I sent you still singing sweetly?

Hey Fred. I have been out of touch lately. The last 2 months have been pretty messed up. I am almost caught up, but I am headed back to CT for another week. This time with my girls. The DAC is doing great. There is an occasional pop even with the signal locked, but the sound is better than my GDA-700. Jerry picked up that cheap DAC you recommended. We haven't ditched the wall wart yet. I my be picking one up myself. I want to do an integrate amp with the DAC built in for the bed room. Also I am thinking about some in the wall SDA's. The only component you will see is just the Integrated amp:) The transport will be my media server via RF remote.

As for the passive comments
Sorry guys about the confusion/high jack. The comments were just general comments about PRs and were not directed twords this project here:o

I was chatting with Fred in CA about doing some boards. I need to get in touch with him again too. We'll talk in a few weeks about that(I'll have a board for you to stuff). It is another piece in the puzzle on that multi tasking pre I have been working on and off for over a year. These tube head Polkies have really taught me a lot as of late. The biggest thing I have learned about tubes is the incredable sound stage that good tubes can pull off that I have never seen via SS or in passive pre's.

Take care.
Ben

Systems

(Sorry this is a Reply to post #30,didnt see the second page.)

Sure if you are trying to achieve one of the alignments like B4,QB3 etc. then you are stuck with a specific box volume and port tuning for that alignment.However with modeling software you are not held fast to a specific alignment and can by trial and error within the software find a usable non standard box volume and tuning that can give satisfactory results.
As you are suggesting though box size/tuning relationship is very important and I have heard a few ported designs that exhibited reasonably tight and tuneful sounding bass though my preference is with sealed especially as you approach the 40hz and below range.

Systems

bikerboy wrote: »

I would greatly appreciate a diagram so I can get the TL cabinet built correctly.

It may take a few days to get the drawing done but certainly will provide you one.

Do you use contact cement to stick the veneer to the box? I read some use elmers glue and iron it together. This will be the first veneer work I have done so it will be fun. Thanks, BB

I use the wood glue iron on method as its much more forgiving than contact cement.I apply the glue to the back of the veneer and the box using a smalll paint roller.I recommend using paperbacked veneer to help avoid it from slitting.Also having a router with a veneer trimming bit will be a big plus.I think I posted pic's previously of thre procees,I will try to find them.

Systems

ShinAce wrote: »

Can we get a pic of the back of the assembled box? Or am I just being greedy?

No pic but the line opening is at the very top of the rear and measures 4.5" wide by 1.5" high.Basically the back panel will be cut short to leave the opening at the top.The final panels are not finished or installed yet,I'm just using a removable panel for the time being.


btw I'm looking for a source of decent and affordable(not Cardas,WBT:D) binding posts that are long enough to mount through a 3/4" panel.

Face

http://soniccraft.com/products/connections/bindingpost/vampire_bp15hex.htm

Systems

ben62670 wrote: »

I have been out of touch lately.

Same here don't read or post much anymore,excepting the last 2 days.

There is an occasional pop even with the signal locked

Mine was doing that aswell if I get it operational again(I stole the analog PS) I will try to find a remedy.

Jerry picked up that cheap DAC you recommended.

Oh yeah I forgot about him getting that one,how's the build and sound quality as is?

The biggest thing I have learned about tubes is the incredable sound stage that good tubes can pull off that I have never seen via SS or in passive pre's.

Oh oh,you have been brainwashed and seduced by those deceptive euphonic tube colorations.:eek::p

ben62670

http://www.parts-express.com/pe/pshowdetl.cfm?&Partnumber=091-1245&scqty=4

I have these. Very cheap yet solid. The solder tab makes it a breeze to solder, and remove. I have used similar ones to the ones face has posted, but you can't remove the wire without unsoldering them.

Oh yeah I forgot about that one,how's the build and sound quality as is?

I haven't spent any time with it, but the SQ is very good. I trust Jerry's ears. We both have very similar taste, and both agree on subtile differences. My car has been dead for almost a month. I am rebuilding the whole top end. The heads will be done tommrrow(decked, and valves recut). So I will be able to get my ears on again.

Oh oh,you have been brainwashed and seduced by those deceptive euphonic tube colorations

Those dirty rats! Seriously until late all the tube gear I have heard was either washed out sounding, or more brittle than those crappy Adcom's I love so much. Before tubes were good with only certain types of music. I never thought in my wildest dreams that tubes could handle anything thrown at them. Imade a thread a while back that tubes were like bandaids. A bunch of people got their panties in a bunch without even reading what I wrote. I have a bunch of CD's that I used to love before I started getting into some real decent gear. On the newer gear the system magnified the faults. Then I had some hands on with some real nice tube pre's and amps. Those bandaid tubes really healed up some really crappy compressed sounding recordings, and still brought out excellent dynamics. Symbols just have such a live sound to them. Sound stage is so much better. I wish you were closer. Anytime you are in the area I will pick you up. What ever it takes. If I had the money I would fly you down here. I don't have gear of that caliber yet, but I have some real good friends nearby that do.
Take care.
Ben

Systems

Face wrote: »

http://soniccraft.com/products/connections/bindingpost/vampire_bp15hex.htm

Thanks Mike those look real nice.

Systems

ben62670 wrote: »

http://www.parts-express.com/pe/pshowdetl.cfm?&Partnumber=091-1245&scqty=4

Thanks those look good aswell.

Systems

I'm posting this to show BB a detailed pic of the real DB1's inards vs my clone shown in post #2 http://www.positive-feedback.com/Issue45/rmaf2009.htm. scroll down to pic# 9.It clearly shows the foam lining and partition locations.

Systems

Here are 3 more pics of the finished clone with laquer applied,and showing xover and foam placement.

ben62670

Very nice as usual. Hows the sound? You run them active yet, or just passive?

Systems

ben62670 wrote: »

Very nice as usual. Hows the sound? You run them active yet, or just passive?

Thanks .Yes I have tried them active and not surprisingly I prefered them that way,abit more dynamic and bigger sounding partly due to more baffle step compensation being added.The steeper slope and lower xover point of the active also improves the midband smoothness.Either way they image like crazy because of the narrow baffle width.The tweeter is a sweety ,it never turns hard or brittle sounding be it with the active or passive network,surprising considering it's cost.

ben62670

I'm looking to do a small set of speakers for the bedroom. Something I can drive with a gainclone. I was thinking about doing a full range Fostex driver and a small tube amp, but I just can't bring myself to do it. Imaging is key, and super low bass or very high levels aren't. Again nice work.

Face

Nice job Fred!

Systems

Thanks Mike.


Ben,you might look at one of Zaph's designs with his new 5" driver.The Vifa RB2 kits are no longer available though you might be able to piece it together separatley,Madisound sells the tweet and I've seen the woofer on ebay.

TECHNOKID

Two thumbs up for your finalized project GV :cool:

Cheers!
TK

proirklad

A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a **** by the clean end.

Systems

proirklad wrote: »

A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a **** by the clean end.

Really,thats deep.:D



Oh and Thanks TK.

vc69

Yeah man, really nice looking job. I totally admire your craftsmanship.

abes99

Hi all tl lovers,cong for the nice job.
in my young days i build a tl from atkinson miniline,i still miss the sound and also miss the plannoone seem to know it.
could you send me dimension please
many thanks
if someboby can get hold of the mini line it would be great
blessing
abes

zingo

Sadly, the good gent who built that pair of speakers is no longer active on this forum.

ShinAce

Not to mention that woofer is likely sold out!

Abe: If you're asking about the atkinson miniline, you should start a new thread to avoid confusion.

Face

zingo wrote: »

Sadly, the good gent who built that pair of speakers is no longer active on this forum.

He's back under another user name.

FTGV

zingo wrote: »

Sadly, the good gent who built that pair of speakers is no longer active on this forum.

I snuck back in when the mods weren't looking.:D

zingo

Sweet

bikerboy

Its only been 2 years but I am making headway on the RB2 TL design that Fred was so nice to share. I am going to screw the sides on so I can play with the stuffing if needed. I need to glue the front baffle on and bolt it up. I made the back so the x over is protected in the back panel.

FTGV

And I thought I took a long time to finish projects.Lookin good so far.

bikerboy

I glued the front baffles on and screwed the side on so I can change the stuffing if needed. I made the back so the crossover is recessed and protected. I listened to them for a while in the mancave and found the lack of bass noticable. I moved them into the garage and placed them in the corners. Now they sound great, nice bass and the tweeter is smooth. They sound much better than the frankenspeakers I used before. They need some hours before I can be critical but I like what I hear so far. Thanks to Fred, as I would never tried to make a folded TL cabinet. Maybe some nice wood veneer or crossover upgrades in the future but I doubt it as they are in the garage for now.