While this is not a full-scale alternative to the likes of SAP or Oracle, Compiere http://www.compiere.org/ does cater to the small and midsize market. This currently only runs on top of the Oracle database, but is in the process of being ported to Postgres.
The question whether 5.1 is inferior to 6.1/7.1 cannot be answered in general. It depends on factors like
(1) quality of all components in the equipment chain
(2) proper placement of the speakers
(3) proper setup of distance/delay for each channel/speaker
(4) proper setup of volume level for each channel/speaker
(5) interaction of the system with the listening environment
(6) quality of the source material
This makes it very hard to generalize. Under some circumstances a quality-wise inferior 5.1 system, which is properly set up, can sound a lot better than a much more expensive 7.1 system where the setup is wrong.
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While this is not a full-scale alternative to the likes of SAP or Oracle, Compiere http://www.compiere.org/ does cater to the small and midsize market. This currently only runs on top of the Oracle database, but is in the process of being ported to Postgres.
The question whether 5.1 is inferior to 6.1/7.1 cannot be answered in general. It depends on factors like
(1) quality of all components in the equipment chain
(2) proper placement of the speakers
(3) proper setup of distance/delay for each channel/speaker
(4) proper setup of volume level for each channel/speaker
(5) interaction of the system with the listening environment
(6) quality of the source material
This makes it very hard to generalize. Under some circumstances a quality-wise inferior 5.1 system, which is properly set up, can sound a lot better than a much more expensive 7.1 system where the setup is wrong.