Bookshelfs required immediately - Please help
- Thread starter saketb
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I got an offer for Rs. 20500/- from Profx showroom.
Lakozy Electronics
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Dear Saket,
Please do look at PSB Alpha B1.
MRP : 14,700/-
Do google for reviews. There are tons of them. Here's one : Home Theater Alpha B1 review - PSB Speakers
Shitij
Please do look at PSB Alpha B1.
MRP : 14,700/-
Do google for reviews. There are tons of them. Here's one : Home Theater Alpha B1 review - PSB Speakers
Shitij
Thanks for the offer, but I was looking for something more than 120watts.
jaudere
Well-Known Member
About the crossover setting.
If you set xo frequency at 40hz, everything below 40hz is fed to subwoof.Above that is fed to fronts. Smaller the cone in diameter, lesser is the capacity to reproduce low frequency sounds well. Thats why, as you must have observed, as the cone size reduces, the recommended xo frequency has gone up so that the smaller speakers are not fed with very low frequencies. Not only they cant play them well,they may get damaged as well because low frequ sounds move the cone a lot.
In your set up,if the speaker claims to come down to 40hz(you actually need to see lower frequency limit at -3dB and not at -10dB Which some manufacturers give to have meaningful figure) ,practically it is ok to consider that they will actually come down to 50hz in audible volume. So you can set cross over frequency to 50. If you set it at 40,the sub will play everything below 40. Since your Polks may not be good between 40-50hz,you may not hear sounds in this range. Whether you will actually notice the missed sounds or no is doubtfull.
For music it hardly makes difference as there is hardly anything below 50. Blasts,earth quakes in games and action movies have sounds below 40hz where sub woof makes difference.
If your sub is good upto 120hz,set xo at 120. It is said that when a midwoofer of fronts is relieved from duty of playing low frequency sounds, it does much better job at mid range. Now why not 150? Above 120hz or so,the bass becomes directional and sub woof placement in the room becomes a problem. Below that, you can keep sub at various places in room without being able to detect from where the low freq sound is coming.
If you are using 2 channel set up,the crossover will work as protection for your speakers from low frequency signals which can damage speakers especially at loud volume. For music without sub,you can set it at 40.
If there is setting for cross over slope, you may need reverse polarity between front and sub. Now i dont remember exactly (my brain is rusting it seems)but i think for slope of 6 and 18 db/octave you need reverse polarity while for 12 &24 will need same polarity. Please confirm it from experts. Easier way,try both polarities. The one giving you better bass is your polarity. If set in opposite way you will immediately notice a dip in bass frequencies(<150 hz)
I Hope this helps. This applies not only to onkyo but most of the set ups. In yamaha,they give option of sub out to front/both/sub. Accordingly low frequ signals below the setting of cross over are fed to front,front+sub or only sub. Again if you choose front speaker as 'small' then low frequencies are not fed to fronts even if you choose sub out to fronts/both. This is for protection of small speakers.
If you set xo frequency at 40hz, everything below 40hz is fed to subwoof.Above that is fed to fronts. Smaller the cone in diameter, lesser is the capacity to reproduce low frequency sounds well. Thats why, as you must have observed, as the cone size reduces, the recommended xo frequency has gone up so that the smaller speakers are not fed with very low frequencies. Not only they cant play them well,they may get damaged as well because low frequ sounds move the cone a lot.
In your set up,if the speaker claims to come down to 40hz(you actually need to see lower frequency limit at -3dB and not at -10dB Which some manufacturers give to have meaningful figure) ,practically it is ok to consider that they will actually come down to 50hz in audible volume. So you can set cross over frequency to 50. If you set it at 40,the sub will play everything below 40. Since your Polks may not be good between 40-50hz,you may not hear sounds in this range. Whether you will actually notice the missed sounds or no is doubtfull.
For music it hardly makes difference as there is hardly anything below 50. Blasts,earth quakes in games and action movies have sounds below 40hz where sub woof makes difference.
If your sub is good upto 120hz,set xo at 120. It is said that when a midwoofer of fronts is relieved from duty of playing low frequency sounds, it does much better job at mid range. Now why not 150? Above 120hz or so,the bass becomes directional and sub woof placement in the room becomes a problem. Below that, you can keep sub at various places in room without being able to detect from where the low freq sound is coming.
If you are using 2 channel set up,the crossover will work as protection for your speakers from low frequency signals which can damage speakers especially at loud volume. For music without sub,you can set it at 40.
If there is setting for cross over slope, you may need reverse polarity between front and sub. Now i dont remember exactly (my brain is rusting it seems)but i think for slope of 6 and 18 db/octave you need reverse polarity while for 12 &24 will need same polarity. Please confirm it from experts. Easier way,try both polarities. The one giving you better bass is your polarity. If set in opposite way you will immediately notice a dip in bass frequencies(<150 hz)
I Hope this helps. This applies not only to onkyo but most of the set ups. In yamaha,they give option of sub out to front/both/sub. Accordingly low frequ signals below the setting of cross over are fed to front,front+sub or only sub. Again if you choose front speaker as 'small' then low frequencies are not fed to fronts even if you choose sub out to fronts/both. This is for protection of small speakers.
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hmm something more than 120w control - thats close to rs 100k for speakers alone
then will buy a stereo amp like a bryston ,classe, accu do do justice ?
you have that big a room and such a requirement huh?
As the specs say, the Polk Audio RTi A3 are 150watts and priced only at 20k for a pair.
Why you have mentioned 100k for 120w, I really do not understand.
Kindly clarify...
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