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-   -   Ideas to make use of space left inside enclosure? (http://www.diyaudio.com/forums/class-d/224206-ideas-make-use-space-left-inside-enclosure.html)

AC439 24th November 2012 04:48 PM

Ideas to make use of space left inside enclosure?
 
Well...I just finished putting a Sure Tk2050 (current version with fan constant on) into an enclosure. There is lot of space left inside. The enclosure is a standard rack mount type 19"(w) about 3.5" thick. Literally, the TK2050 only used about 25% of the space inside.

I don't want to waste the space so I'm thinking of putting "something" inside. I came up with a couple of ideas -

1) Another T-amp (I have an Sonic Impact 5066 TA2024 needed mod and another enclosure).
2) A tube pre-amp.
3) A DAC.

Idea #1 is a bit crazy putting two amps into one enclosure.
Idea #2 maybe logical and I can separate them into individual power supplies and RCAs in/out so I can link them together or to use them one at a time.
Idea #3 - I use my ipod in general as source. I'm not sure if I should change to a DAC and drive it by a PC.

(BTW, the Sure TK2050 was a mistake to buy. I bought it from PartsExpress with another item just to get the free shipping. It does have the lack of bass problem as discussed in this forum before. I think the output coils are the problem. I have modded the input caps with ERO 2.2uF MKT 1813 and the tank caps with 2200uF NOS German ROE Gold caps. I had to adjust the offset, they didn't do it at the factory. I added a Zobel at the output as well since I'm driving my Tannoy MKII and the speakers have bright treble already. The sound was harsh at the very beginning but now sounds good. Still want more bass though.)

JRKO 24th November 2012 05:00 PM

Off the top of my head:

1)Battery power supply & charge system for off grid power (with that and your ipod and you are mains free!!)
2)Better heat sink so you can bin the fan (pc passive cooler type)
3)B1 Preamp with great volume control
4)DAC & power supply (batteries also good)
5)Phono stage
6)Your stash ;)

takitaj 24th November 2012 05:17 PM

Re: Ideas to make use of space left inside enclosure?
 
You could throw in one of those velman preamp boards from PE and have volume and tone controls. They have a gain of 1 but you can change a couple resistors to increase it and change out the opamps to something better than the TL072's. Or build something else from a reputable design that has tone controls.

TJ

Bare 24th November 2012 06:11 PM

Buy a suitable sized case?
Fit in another or 2 more amp boards and associated paraphenalia including power supplies for a Bi amp/Tri Amp capable unit.
Tone controls and preamps are rarely actually needed these days IMO, unless using Vinyl.

takitaj 24th November 2012 06:56 PM

Quote:

Originally Posted by Bare (Post 3254638)
Tone controls and preamps are rarely actually needed these days IMO, unless using Vinyl.

While that may be true, the OP was dissatisfied with the lack of bass and a preamp was on his list of things he was thinking about. The enclosure he already has and mounted everything into has more leftover space than he thought. I know I wouldn't listen to a CD without some sort of sound shaping. Blech :) (JMO)

TJ

AC439 24th November 2012 07:59 PM

Thanks guys for the ideas. I don't think I will go off-grid/solar setup. I'm renting a house so installing panels outside is out of the questions. I have powered my TA2024 by 12v car battery and it does sound good. But I remember swapping out 12v SLAs from computer UPS are just expensive. Somehow the SLA won't last very long. Have also built something similar to B1 with MPF102 for my Musical Fidelity A1s just to eliminate the bad sounding OP-AMPs. In the same token, I'm trying to avoid tone control (usually with OP-AMPs). The case was a steal to get for $20 so I don't think I will buy another case soon. Although I think the TK2050 is a little weak in bass, it is not too bad and I think I will change out the output coils (thinking about DIY air-core). I already removed the fan over the heat sink. My wife doesn't like me listen in high volume so the fan is not real necessary. I measured the power drawn with one of those Kill-A-Watt thing and the amp draws only about 5W with the volume higher that what I usually needed. I think my speakers are very efficient in this case. Well...I guess I'm going off-topic myself.....

I'm down to either a tube preamp or put the TA2024 into the same box. Since I have multiple pairs of speakers in the same locations, I can have the TA2024 driving one pair while the TK2050 driving another (Bi-amp ??) Then I'm killing myself for not buying the 4x100W version of TK2050 board to start with. But I do think the TA2024 has more magic than the TK2050 (off-topic again).

More ideas ?

JRKO 24th November 2012 09:05 PM

playing mixed sets of speakers and amps simultaneously is for annoying neighbours not listening to

You could biamp you speakers using the 2024 for the tweets and the 2050 for the bass. Get a minidsp and you could sort the bass issue as well.

a 2024 should not kill a 12v sla for ages - hours and hours of playtime and the battery should not need to be replaced for a good few years.

AC439 24th November 2012 09:27 PM

No, no, no. I'm not going to use both amps at the same time. I was thinking "Bi-Amp" as meaning two separated amps in same enclosure (my senior moment). Not that the regular definition that people use here (with active crossover, driving tweeter and woofer separately etc).

I don't think I will go bi-amp route because I don't have an active crossover. My goal is to put as little active components in the signal path as possible. I have abandoned using tone control or any equalizer for ages. It is true though the TA-2024 draws very little current when I was connecting it to car battery........

Bare 26th November 2012 04:42 PM

One Can bi amp by running a separate amp to a split passive crossover, where the one amp feeds one Driver and another feeds the HF section. A bit tricky to get 'right' and not as good as a Decent active crossover.. still it's an improvement and fun to experiment with.
Got enough supply capacitance in your 2050 circuit setup ? Could be your bass 'problem'.
Sure spends much of their costs on their case, not the innards IMO.

freax 26th November 2012 04:56 PM

Quote:

Originally Posted by JRKO (Post 3254551)
Off the top of my head:

1)Battery power supply & charge system for off grid power (with that and your ipod and you are mains free!!)
2)Better heat sink so you can bin the fan (pc passive cooler type)
3)B1 Preamp with great volume control
4)DAC & power supply (batteries also good)
5)Phono stage
6)Your stash ;)


I'll vouch for #4:
http://www.diyaudio.com/forums/digit...-off-ebay.html

It will run straight off a 6v SLA no probs, or at 7v with a LM200C volt regulator, modification is needed for the power supply of the CS8412 before you can go beyond 7v though. (the addition of a 7805)

I suggest replacement of the supplied output coupling capacitors though with PIO types.

Consumption is exceptionally low, 5 hours could pass and a bnew 7AH battery could drop from 6.50v to 6.42v

People in the 1950's would be stunned at this.

Another thing that gives similar battery life would be an ipad 3, which makes a good source and all-round browser/email/irc client. for 10 hours per charge.!


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