Hi all. I’m looking to replace the infinity 7521a that I have been using to power my infinity 10.1 sub. The sub is rated for 350W and the infinity amp is pushing 283w bridged. I don’t want to spend more than 300-350$ and it can’t be any larger than the 7521a; 12”x12”x3”.
The polk c500.1 fits the bill (exactly 350W and small) but is kind of pricy at ~$370. I found a HIFONICS Bxi1206D for $270, which will do 450W. First, is HIFONICS a solid brand? And second, what kinds of problem will I run into pushing a 350W sub with a 450W amp? Thanks.
Oh, so I’m replacing the amp because it clips a bit soon and I figure a D class amp should be a bit easier on my car’s electrical system. Correct?
Replies (5)
swez on 06/22/2006 13:09:36
Actually , the amp you have now, is a very good match when bridged MONO to this 4 ohm sub. (Perfect 10.1 is a 4 ohm SVC)
If you wanted more power and Class D performance, you'd have to look at Class D amps like:
1. JL 500/1
2. Infinity Reference 611a
3. JBL Grand Touring Series GTO601.1 II
4. Kenwood KAC-9102D
5. Polk/MOMO C500.1
6. Phoenix Gold RSd600.1
See, if you only have 1 Per 10.1 sub, you are stuck at 4 ohms. If you either changed to dual subs (P10.1) or went with a larger class D amp and a stought 4+4 woofer, then you'd have some wiggle room here.
That Infinity amp is perfect for strong front speakers. They could be either Coaxial or Components. It's not a bad fit for a 4 ohm sub either.
Your cheapest options here are:
a. Stronger 2 channel amp and using the same sub
b. Get the Infinity REF611a for your present sub
c. Look at these too
http://www.onlinecarstereo.com/CarAudio/ProductDetail.aspx?ProductID=14933
http://www.cardomain.com/item/PHOX4001 (Best choice for price, power, features and a very good brand name)
Swez
Some careful shopping can get you the price range desired.
pigwiggle on 06/22/2006 16:00:57
I’m a little surprised that going from the 280W amp to a 350W amp won’t make that much difference. The woofer is underpowered by ~20%, so in my naive estimation I should be able to get 20% greater volume by increasing the power 70W, right? Also, is the only advantage of the class D amp electrical efficiency, more power to power, less to heat? And I’m still wondering what problems I am going to have if I use an amp rated for a great RMSW than my woofer. How do I know when it is too much? Thanks.
pigwiggle on 06/22/2006 16:24:07
From what I've googled so far it looks like folks think the SQ of class D is inferior to class A/B. Any opinions?
Victor on 06/22/2006 18:01:35
Theoritically they are completely true....
But because of the high power demand of subwoofers, and heavy current draw of class A/B due to its efficiency, usually Class D amps are suggested for Sub-woofer applications,
Also , Since the distortion in lower frequencies is less noticable, Class D amps perform sufficiently well, for the application.
Regarding the amount of power to use,
Usually most manufacturers provide a range of Power in which the sub, performs at its best.
Generally its a +/- 33% of the rated power.
There is a proved concept of Head room, where in , more power is supplied to the speaker for better performance and lower distortion.
But since there is no noticable difference in the SPL , ( doubling the power will give u only a rise of 3db, which can also be achieved by other means of designing a different enclosure. )
A bit more powerful amplifier is also going to cost more, and give no to very less audible difference, people generally dont prefer to spend more.
going from a 280wrms amp to a 350wrms, will not give u a rise of more than 0.5 db, if you want louder volume , you should be thinking of designing a Ported, EBS, ABC, TL, or Band pass enclosure....
Power usage also depends a lot on the type of enclosure used, If you wanna use more power than the rated power of the sub, you should be ideally building a sealed enclosure of propotionally smaller size to control the cone movement, or you are risking your sub with over excursion.
Hope that helps...
comments...??
Victor...
pigwiggle on 06/22/2006 19:53:35
OK, thanks all. I guess I'm off the idea of getting a new amp.
The polk c500.1 fits the bill (exactly 350W and small) but is kind of pricy at ~$370. I found a HIFONICS Bxi1206D for $270, which will do 450W. First, is HIFONICS a solid brand? And second, what kinds of problem will I run into pushing a 350W sub with a 450W amp? Thanks.
Oh, so I’m replacing the amp because it clips a bit soon and I figure a D class amp should be a bit easier on my car’s electrical system. Correct?
Replies (5)
swez on 06/22/2006 13:09:36
Actually , the amp you have now, is a very good match when bridged MONO to this 4 ohm sub. (Perfect 10.1 is a 4 ohm SVC)
If you wanted more power and Class D performance, you'd have to look at Class D amps like:
1. JL 500/1
2. Infinity Reference 611a
3. JBL Grand Touring Series GTO601.1 II
4. Kenwood KAC-9102D
5. Polk/MOMO C500.1
6. Phoenix Gold RSd600.1
See, if you only have 1 Per 10.1 sub, you are stuck at 4 ohms. If you either changed to dual subs (P10.1) or went with a larger class D amp and a stought 4+4 woofer, then you'd have some wiggle room here.
That Infinity amp is perfect for strong front speakers. They could be either Coaxial or Components. It's not a bad fit for a 4 ohm sub either.
Your cheapest options here are:
a. Stronger 2 channel amp and using the same sub
b. Get the Infinity REF611a for your present sub
c. Look at these too
http://www.onlinecarstereo.com/CarAudio/ProductDetail.aspx?ProductID=14933
http://www.cardomain.com/item/PHOX4001 (Best choice for price, power, features and a very good brand name)
Swez
Some careful shopping can get you the price range desired.
pigwiggle on 06/22/2006 16:00:57
I’m a little surprised that going from the 280W amp to a 350W amp won’t make that much difference. The woofer is underpowered by ~20%, so in my naive estimation I should be able to get 20% greater volume by increasing the power 70W, right? Also, is the only advantage of the class D amp electrical efficiency, more power to power, less to heat? And I’m still wondering what problems I am going to have if I use an amp rated for a great RMSW than my woofer. How do I know when it is too much? Thanks.
pigwiggle on 06/22/2006 16:24:07
From what I've googled so far it looks like folks think the SQ of class D is inferior to class A/B. Any opinions?
Victor on 06/22/2006 18:01:35
Theoritically they are completely true....
But because of the high power demand of subwoofers, and heavy current draw of class A/B due to its efficiency, usually Class D amps are suggested for Sub-woofer applications,
Also , Since the distortion in lower frequencies is less noticable, Class D amps perform sufficiently well, for the application.
Regarding the amount of power to use,
Usually most manufacturers provide a range of Power in which the sub, performs at its best.
Generally its a +/- 33% of the rated power.
There is a proved concept of Head room, where in , more power is supplied to the speaker for better performance and lower distortion.
But since there is no noticable difference in the SPL , ( doubling the power will give u only a rise of 3db, which can also be achieved by other means of designing a different enclosure. )
A bit more powerful amplifier is also going to cost more, and give no to very less audible difference, people generally dont prefer to spend more.
going from a 280wrms amp to a 350wrms, will not give u a rise of more than 0.5 db, if you want louder volume , you should be thinking of designing a Ported, EBS, ABC, TL, or Band pass enclosure....
Power usage also depends a lot on the type of enclosure used, If you wanna use more power than the rated power of the sub, you should be ideally building a sealed enclosure of propotionally smaller size to control the cone movement, or you are risking your sub with over excursion.
Hope that helps...
comments...??
Victor...
pigwiggle on 06/22/2006 19:53:35
OK, thanks all. I guess I'm off the idea of getting a new amp.
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