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> Altec Lansing Fan Club V2 (128 members!), Sound Leadership For The Digital Age

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Tim_HKG
post May 5 2011, 03:50 AM

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Quoted: <IMO, JRC4558 can be replaced, to NE5532 if you want go for budget one. That cheapo op-amp are some better than JRC4558, for better ones try go for LME49720 or LME49860 depends on the power supply voltage. Other Burr Brown op-amp such as OPA2604 or OPA2134 can try out also but i personally not like it for swapping purpose, coz it does not sound like the way it like.>

Thanks for your suggestions! What do you think of S5532(1986/87/89), OP275 and AD827SQ/883B(quite expensive...)? Between S5532 and OP275, which one is better? One more thing, ACS 45.1 runs at a single 12V power supply(correct?).
Tim_HKG
post May 5 2011, 04:18 PM

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QUOTE(beggarmaster2000 @ May 5 2011, 07:37 AM)
huhuhu =) i votes 4558
waste money and time on opamp, when the source is going to be from 'somewhere' and the stock speakers cannot go 'there'
too much limitations on this set.
for fun's sake, just hit 'whatever' comes first =)

yeah single, and the powerbrick sucks brix
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The limitation of the source? Is it the TDA7370B, or from the sound card, the computer? So, for fun purpose as well as improvement, what else cound be done on it at this moment?


Added on May 5, 2011, 4:19 pm
QUOTE(Cosef @ May 5 2011, 02:38 PM)
S5532? you mean NE5532?
I haven't tried op-amp from analog device i can't tell you the results.
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Yes, S5532 is NE5532. It has a big "S" before the printed model number, and they were manufactured in the older days, someone said those older-manufactured stocks is good at sound. By the way, I have no idea of it.

This post has been edited by Tim_HKG: May 5 2011, 04:19 PM
Tim_HKG
post May 8 2011, 02:02 AM

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Yes, I know the limitations. From the start, I know the purpose-built design of ACS 45.1 is by no means hi-fi equipment, the aim of modding it is just for fun as well as improving its sound quality! After the 1st & 2nd phase modding, I would say the sound quality does improve a lot though it uses TDA7370B which has a 10% THD , it can even to some extent challenge some mini or entry-level hi-fi systems!

Besides, the size of this ACS 45.1 fits the limit room, it's easy to connect a hi-fi system to my computer but difficult to place them since they take up a lot of space!

So, I'll keep up modding it depending on the possibilties and of course the cost effective. Perhaps it's no more an ACS 45.1 since I have even had the satellite speaker units replaced years ago too. That's why I enquired for the possible advantages of having op-amps and some others ICs replaced.

This post has been edited by Tim_HKG: May 8 2011, 02:23 AM
Tim_HKG
post May 10 2011, 10:25 PM

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QUOTE(beggarmaster2000 @ May 10 2011, 08:57 AM)
hehe =) TDA7375 is cost 15-30 bugs... 2134 27bug ea
i'm not sure but...
wait wait... 2134 8bugs...ea
hmmn hehe online shoppin

so how much are you gonna spend on your 5 opamps? hahaha
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Dual op-amps:
1 x AD828AR + 3 x OPA2132U for sound card.
5 x NE5532AN(80's big S version) or OPA275, OPA627, OPA2604, AD827...for ACS45.1.

Qual op-amp: AD713, LT1014...for ACS45.1.

Prices depend on which models I'm going to take, it maybe several tens or over a hundred US dollars in total. By the way, a limit amount of money, just thinking whether it's worthy of putting them onto such a low-value ACS45.1.

However, there's no real demonstration, not sure whether there will be improvement, so quite confused of which one will be better, and even consider whether go replacing those op-amps.

The order is still waiting for my confirmation...not yet decided.

This post has been edited by Tim_HKG: May 11 2011, 01:24 AM
Tim_HKG
post Jun 20 2011, 10:58 PM

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1st-phase modification: left & right channels rebuilt independently as well as all the cables replaced inside out.
user posted image

2nd-phase modification: replacement of nearly all the electrolytic capacitors.
user posted image


It's been a long road for a newbie like me, getting the original ACS45.1 from there to here, from live to death, from death to live again...! There's a saying: never trouble trouble till trouble troubles you...! No, that's not the way! Modding keeps going on!

3rd-phase modification: all the op-amps have to be replaced.
user posted image

Let's see how it's going to be...report later!

This post has been edited by Tim_HKG: Jun 20 2011, 11:00 PM
Tim_HKG
post Jun 30 2011, 04:40 PM

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First comes the AD713KN and "Big S" NE5532AN..., to be honest, the quality of sound does improve a lot even the NE5532AN by no means any high-class op-amp!

user posted image

This post has been edited by Tim_HKG: Jun 30 2011, 04:49 PM
Tim_HKG
post Jul 3 2011, 01:28 AM

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QUOTE(beggarmaster2000 @ Jun 30 2011, 05:20 PM)
congrats, now you just need to change the sub woofer cable to direct solder
if you don't change the sub speaker cable, there will be 'bass lag' mili seconds sound slow reach....
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At the initial modding stage, I did solder the subwoofer cable onto the pcb directly. However, later on it had broken the fragile soldering pads, so I removed it.
user posted image


Now I'm trying to figure out drilling holes on the pcb for a cable connector as picture below shows.
user posted image

This post has been edited by Tim_HKG: Jul 3 2011, 01:37 AM

 

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