gainclones single chip vs parallel config - Page 3

Minion · 24th June 2009, 11:11 PM

Couldn"t you also just use a Lower Gain on the Tweeter chipamp to get less output power ??

kscharf · 25th June 2009, 12:44 AM

Quote:

Originally posted by Minion
Couldn"t you also just use a Lower Gain on the Tweeter chipamp to get less output power ??

BION these chips are unstable at low gain settings.

Minion · 25th June 2009, 02:12 AM

They are unstable at gains under 10 I think but you could run the Tweeters at 15x and the woofer at 30x for example .....

pacificblue · 25th June 2009, 06:58 AM

..or attenuate the tweeter in an active crossover with a potentiometer/trimmer, which makes it easy to adjust later on. On the other hand there seems to be only a capacitor in front of the tweeter, so maybe the two drivers are already of similar sensitivity. Then they would need the same gain and level.

ruijorgemoreno · 25th June 2009, 01:36 PM

Today I woke up with a thought in my mind.. Try what AndrewT said..
So I remembered my father's 20-year Rising Hi-fi system (mine also

) wich has 4 ouputs..

So I listened both configurations for a while..
And, the first impression is:

Paralelled: Good sound. Very good bass. Treble could be a little more clean, though...

Sperated inputs: The bass is a little less loud but the treble is way way better! Of course the treble is, as Redshift187 mentioned, a little overpowered but I compensated that with equalization just to have a better idea.
(I found this speakers quite impressive for they size )

Have not decided quite yet but I think the bi-amplified config is a good choice.. I'd have to make a crossover though...

RJ

AndrewT · 25th June 2009, 01:50 PM

Hi,
there's a first conclusion:
bi-amplifying a bi-wireable speaker makes the sound output different.

Many builders and listeners on this Forum say this conclusion is either impossible or a waste of resources.

How does one amplifier (non parallel) compare to two amplifiers driving the separated terminals?

ruijorgemoreno · 25th June 2009, 05:07 PM

Quote:

Many builders and listeners on this Forum say this conclusion is either impossible or a waste of resources.

Well, they are - not intending to offend anyone - completely wrong!
Maybe it's just my constant search for sound perfectness..Or at least anything close to it!

I'm sure bi-amplifying is quite more expensive and laborious, but in my opinion, it's definitly worth it!!
Anyway, let's think: We guys make what? an amp per year, perhaps! Technics/Panasonic engineers make - just guessing here - some dozens/year ?! I really don't think those guys would make bi-amplified systems just for fun!!

It's only my guess though...

Quote:

How does one amplifier (non parallel) compare to two amplifiers driving the separated terminals?

What do you mean? Bi-amplifying comparing to amplifying the seperated terminals with only one amp? Is this what you mean? I'm sorry, Portuguese guy here!! :

RJ.

AndrewT · 25th June 2009, 05:54 PM

Quote:

Originally posted by ruijorgemoreno
What do you mean? Bi-amplifying comparing to amplifying the seperated terminals with only one amp? Is this what you mean?

yes, use one amplifier (non parallel) to drive both sets of terminals (Treble + Mid/bass) compared to using two amplifiers, one to each pair of terminals (amp to Mid/base, separate amp to Treble).

ruijorgemoreno · 26th June 2009, 09:22 PM

But that's precisely what I've done!!
Sorry if I didn't express my self in a better way..

RJ.

25th June 2009, 06:58 AM	#24
pacificblue diyAudio Member Join Date: May 2008	..or attenuate the tweeter in an active crossover with a potentiometer/trimmer, which makes it easy to adjust later on. On the other hand there seems to be only a capacitor in front of the tweeter, so maybe the two drivers are already of similar sensitivity. Then they would need the same gain and level. __________________ If you've always done it like that, then it's probably wrong. (Henry Ford)

25th June 2009, 01:50 PM	#26
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	bi-amplify does not equate to active speaker Hi, there's a first conclusion: bi-amplifying a bi-wireable speaker makes the sound output different. Many builders and listeners on this Forum say this conclusion is either impossible or a waste of resources. How does one amplifier (non parallel) compare to two amplifiers driving the separated terminals? __________________ regards Andrew T.

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24th June 2009, 11:11 PM	#21
Minion diyAudio Member Join Date: May 2006	Couldn"t you also just use a Lower Gain on the Tweeter chipamp to get less output power ??

25th June 2009, 02:12 AM	#23
Minion diyAudio Member Join Date: May 2006	They are unstable at gains under 10 I think but you could run the Tweeters at 15x and the woofer at 30x for example .....

25th June 2009, 01:36 PM	#25
ruijorgemoreno diyAudio Member Join Date: Jun 2009	Today I woke up with a thought in my mind.. Try what AndrewT said.. So I remembered my father's 20-year Rising Hi-fi system (mine also ) wich has 4 ouputs.. So I listened both configurations for a while.. And, the first impression is: Paralelled: Good sound. Very good bass. Treble could be a little more clean, though... Sperated inputs: The bass is a little less loud but the treble is way way better! Of course the treble is, as Redshift187 mentioned, a little overpowered but I compensated that with equalization just to have a better idea. (I found this speakers quite impressive for they size ) Have not decided quite yet but I think the bi-amplified config is a good choice.. I'd have to make a crossover though... RJ

26th June 2009, 09:22 PM	#29
ruijorgemoreno diyAudio Member Join Date: Jun 2009	But that's precisely what I've done!! Sorry if I didn't express my self in a better way.. RJ.

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