{"id":4045,"date":"2026-10-13T03:40:00","date_gmt":"2026-10-13T03:40:00","guid":{"rendered":"https:\/\/spe-audio.com\/subwoofer-polarity-and-phase-checks-during-system-commissioning\/"},"modified":"2026-10-03T11:27:30","modified_gmt":"2026-10-03T11:27:30","slug":"kiem-tra-cuc-tinh-va-pha-cua-loa-sieu-tram-trong-qua-trinh-van-hanh-thu-he-thong","status":"publish","type":"post","link":"https:\/\/spe-audio.com\/vi\/subwoofer-polarity-and-phase-checks-during-system-commissioning\/","title":{"rendered":"Ki\u1ec3m tra c\u1ef1c t\u00ednh v\u00e0 pha c\u1ee7a loa si\u00eau tr\u1ea7m trong qu\u00e1 tr\u00ecnh v\u1eadn h\u00e0nh th\u1eed h\u1ec7 th\u1ed1ng"},"content":{"rendered":"

\"Ki\u1ec3m<\/p>\n

Vi\u1ec7c l\u1ef1a ch\u1ecdn loa si\u00eau tr\u1ea7m l\u00e0 m\u1ed9t quy\u1ebft \u0111\u1ecbnh mang t\u00ednh h\u1ec7 th\u1ed1ng. K\u00edch th\u01b0\u1edbc th\u00f9ng loa, v\u1ecb tr\u00ed \u0111\u1eb7t, b\u1ed9 ph\u00e2n t\u1ea7n, c\u1ef1c t\u00ednh, ph\u01b0\u01a1ng th\u1ee9c v\u1eadn chuy\u1ec3n v\u00e0 chi\u1ebfn l\u01b0\u1ee3c khu\u1ebfch \u0111\u1ea1i \u0111\u1ec1u \u1ea3nh h\u01b0\u1edfng l\u1eabn nhau, do \u0111\u00f3 ng\u01b0\u1eddi mua c\u1ea7n m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p c\u00f3 th\u1ec3 ki\u1ec3m tra \u0111\u01b0\u1ee3c sau khi nh\u1eadn h\u00e0ng. B\u00e0i vi\u1ebft n\u00e0y t\u1eadp trung v\u00e0o c\u00e2u h\u1ecfi v\u1ec1 th\u1eed nghi\u1ec7m c\u0103n ch\u1ec9nh pha c\u1ef1c t\u00ednh loa si\u00eau tr\u1ea7m t\u1eeb g\u00f3c \u0111\u1ed9 k\u1ef9 thu\u1eadt d\u00e0nh cho k\u1ef9 thu\u1eadt vi\u00ean h\u1ec7 th\u1ed1ng. B\u00e0i vi\u1ebft \u0111\u01b0\u1ee3c vi\u1ebft d\u00e0nh cho ng\u01b0\u1eddi mua c\u1ea7n m\u1ed9t quy\u1ebft \u0111\u1ecbnh c\u00f3 c\u01a1 s\u1edf v\u1eefng ch\u1eafc, ch\u1ee9 kh\u00f4ng ph\u1ea3i m\u1ed9t danh s\u00e1ch c\u00e1c t\u00ednh t\u1eeb m\u00f4 t\u1ea3.<\/p>\n

C\u00e1c thu\u1eadt ng\u1eef chuy\u00ean m\u00f4n bao g\u1ed3m: v\u00f9ng giao thoa, c\u1ef1c t\u00ednh, c\u0103n ch\u1ec9nh pha, b\u1ed1 tr\u00ed h\u00ecnh tim v\u00e0 m\u1edf r\u1ed9ng d\u1ea3i t\u1ea7n s\u1ed1 th\u1ea5p. H\u00e3y coi m\u1ed7i thu\u1eadt ng\u1eef nh\u01b0 m\u1ed9t c\u00e2u h\u1ecfi c\u1ea7n tr\u1ea3 l\u1eddi trong b\u1ea3n t\u00f3m t\u1eaft. V\u00ed d\u1ee5: s\u1ed1 li\u1ec7u v\u1ec1 ph\u1ea1m vi ph\u1ee7 s\u00f3ng c\u1ea7n c\u00f3 th\u00f4ng tin v\u1ec1 v\u1ecb tr\u00ed v\u00e0 \u0111i\u1ec1u ki\u1ec7n th\u1eed nghi\u1ec7m; s\u1ed1 k\u00eanh c\u1ee7a b\u1ed9 tr\u1ed9n \u00e2m c\u1ea7n c\u00f3 s\u01a1 \u0111\u1ed3 k\u1ebft n\u1ed1i \u0111\u1ea7u v\u00e0o\/\u0111\u1ea7u ra; cam k\u1ebft v\u1ec1 nh\u00e3n hi\u1ec7u ri\u00eang c\u1ea7n c\u00f3 h\u1ed3 s\u01a1 s\u1eeda \u0111\u1ed5i v\u00e0 ph\u00ea duy\u1ec7t.<\/p>\n

L\u1eadp b\u1ea3n t\u00f3m t\u1eaft d\u1ef1 \u00e1n tr\u01b0\u1edbc khi l\u1eadp b\u00e1o gi\u00e1<\/h2>\n

\u4f7f\u7528 Danh m\u1ee5c s\u1ea3n ph\u1ea9m li\u00ean quan c\u1ee7a SPE Audio<\/a> H\u00e3y ch\u1ecdn danh m\u1ee5c s\u1ea3n ph\u1ea9m l\u00e0m b\u1ed1i c\u1ea3nh ban \u0111\u1ea7u, sau \u0111\u00f3 m\u1edf trang s\u1ea3n ph\u1ea9m c\u1ee5 th\u1ec3 tr\u01b0\u1edbc khi sao ch\u00e9p th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt. Hi\u1ec7n t\u1ea1i, trang web \u0111ang li\u1ec7t k\u00ea c\u00e1c lo\u1ea1i ampli chuy\u00ean nghi\u1ec7p, h\u1ec7 th\u1ed1ng loa m\u1ea3ng d\u00f2ng, loa si\u00eau tr\u1ea7m, b\u00e0n tr\u1ed9n \u00e2m thanh, loa to\u00e0n d\u1ea3i v\u00e0 h\u1ec7 th\u1ed1ng gi\u1ea3i tr\u00ed; tuy nhi\u00ean, c\u1ea5u h\u00ecnh d\u1ef1 \u00e1n v\u1eabn c\u1ea7n \u0111\u01b0\u1ee3c x\u00e1c nh\u1eadn b\u1eb1ng v\u0103n b\u1ea3n.<\/p>\n

\u0110\u1ed1i v\u1edbi b\u1ea3n y\u00eau c\u1ea7u k\u1ef9 thu\u1eadt v\u1ec1 loa si\u00eau tr\u1ea7m, h\u00e3y l\u00e0m r\u00f5 li\u1ec7u \u01b0u ti\u00ean l\u00e0 d\u1ea3i t\u1ea7n m\u1edf r\u1ed9ng, s\u1ee9c m\u1ea1nh \u00e2m thanh, ki\u1ec3m so\u00e1t h\u01b0\u1edbng \u00e2m, kh\u1ea3 n\u0103ng di chuy\u1ec3n hay m\u1ed9t kho thi\u1ebft b\u1ecb cho thu\u00ea c\u00e2n b\u1eb1ng. Th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt c\u1ee7a m\u1ed9t th\u00f9ng loa duy nh\u1ea5t kh\u00f4ng th\u1ec3 \u0111\u00e1p \u1ee9ng \u0111\u01b0\u1ee3c c\u1ea3 n\u0103m y\u00eau c\u1ea7u n\u00e0y. Y\u00eau c\u1ea7u nh\u00e0 cung c\u1ea5p n\u00eau r\u00f5 c\u00e1ch gh\u00e9p \u0111\u00f4i d\u1ef1 ki\u1ebfn, c\u00e1c gi\u1ea3 \u0111\u1ecbnh v\u1ec1 x\u1eed l\u00fd t\u00edn hi\u1ec7u v\u00e0 c\u00e1c \u0111i\u1ec1u ki\u1ec7n c\u1ee5 th\u1ec3 \u0111\u1ec3 ki\u1ec3m tra k\u1ebft qu\u1ea3 \u0111\u01b0\u1ee3c b\u00e1o gi\u00e1.<\/p>\n\n\n\n\n\n\n\n\n
Vai tr\u00f2 t\u1ea7n s\u1ed1 th\u1ea5p<\/th>\nLoa ch\u00ednh, loa ph\u1ee5, loa m\u1edf r\u1ed9ng, loa cardioid ho\u1eb7c loa b\u1ed5 sung<\/th>\nX\u00e1c \u0111\u1ecbnh c\u00e1c v\u1ea5n \u0111\u1ec1 li\u00ean quan \u0111\u1ebfn vi\u1ec7c b\u1ed1 tr\u00ed v\u00e0 x\u1eed l\u00fd<\/th>\n<\/tr>\n<\/thead>\n
Vai tr\u00f2 t\u1ea7n s\u1ed1 th\u1ea5p<\/td>\nLoa ch\u00ednh, loa ph\u1ee5, loa m\u1edf r\u1ed9ng, loa cardioid ho\u1eb7c loa b\u1ed5 sung<\/td>\nX\u00e1c \u0111\u1ecbnh c\u00e1c v\u1ea5n \u0111\u1ec1 li\u00ean quan \u0111\u1ebfn vi\u1ec7c b\u1ed1 tr\u00ed v\u00e0 x\u1eed l\u00fd<\/td>\n<\/tr>\n
B\u1ea3n v\u1ebd c\u01a1 kh\u00ed<\/td>\nV\u1eadn chuy\u1ec3n, l\u1eafp \u0111\u1eb7t, ti\u1ebfp c\u1eadn v\u00e0 \u0111i\u1ec1u ki\u1ec7n th\u1eddi ti\u1ebft<\/td>\nThay \u0111\u1ed5i ph\u1ea1m vi tri\u1ec3n khai c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng<\/td>\n<\/tr>\n
T\u1ea3i \u0111i\u1ec7n<\/td>\nTr\u1edf kh\u00e1ng, c\u00e1c k\u00eanh khu\u1ebfch \u0111\u1ea1i v\u00e0 ti\u00eau chu\u1ea9n c\u00f4ng su\u1ea5t<\/td>\nNg\u0103n ch\u1eb7n vi\u1ec7c b\u00e1o gi\u00e1 kh\u00f4ng an to\u00e0n ho\u1eb7c kh\u00f4ng \u0111\u1ea7y \u0111\u1ee7<\/td>\n<\/tr>\n
S\u1ef1 ch\u1ea5p nh\u1eadn<\/td>\nKi\u1ec3m tra c\u1ef1c t\u00ednh, pha, m\u1ee9c t\u00edn hi\u1ec7u v\u00e0 ph\u1ea1m vi ph\u1ee7 s\u00f3ng<\/td>\nX\u00e1c nh\u1eadn h\u1ec7 th\u1ed1ng ho\u1ea1t \u0111\u1ed9ng \u0111\u00fang nh\u01b0 thi\u1ebft k\u1ebf<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Xem x\u00e9t ph\u1ea3n h\u1ed3i c\u1ee7a nh\u00e0 cung c\u1ea5p t\u1eebng d\u00f2ng m\u1ed9t<\/h2>\n

\u0110\u1ed1i v\u1edbi ch\u1ee7 \u0111\u1ec1 n\u00e0y, b\u1ed9 t\u00e0i li\u1ec7u tham kh\u1ea3o k\u1ef9 thu\u1eadt n\u00ean bao g\u1ed3m Ch\u01b0\u01a1ng tr\u00ecnh \u0111\u00e0o t\u1ea1o c\u1ee7a d&b audiotechnik<\/a> \u548c C\u00e1c ngu\u1ed3n l\u1ef1c c\u1ee7a QSC<\/a>. C\u00e1c ngu\u1ed3n n\u00e0y gi\u00fap x\u00e1c \u0111\u1ecbnh ph\u01b0\u01a1ng ph\u00e1p ho\u1eb7c thu\u1eadt ng\u1eef; ch\u00fang kh\u00f4ng thay th\u1ebf cho b\u1ea3n v\u1ebd d\u1ef1 \u00e1n, k\u1ebft qu\u1ea3 \u0111o \u0111\u1ea1c ho\u1eb7c tuy\u00ean b\u1ed1 c\u1ee7a nh\u00e0 cung c\u1ea5p.<\/p>\n

M\u1ed9t b\u1ea3n y\u00eau c\u1ea7u b\u00e1o gi\u00e1 (RFQ) t\u1ed1t ph\u1ea3i n\u00eau r\u00f5 nh\u1eefng th\u00f4ng tin \u0111\u00e3 bi\u1ebft, nh\u1eefng gi\u1ea3 \u0111\u1ecbnh v\u00e0 nh\u1eefng y\u1ebfu t\u1ed1 c\u1ea7n \u0111\u01b0\u1ee3c ki\u1ec3m tra. B\u1ea3n y\u00eau c\u1ea7u n\u00e0y c\u0169ng ph\u1ea3i ch\u1ec9 \u0111\u1ecbnh r\u00f5 ng\u01b0\u1eddi ch\u1ecbu tr\u00e1ch nhi\u1ec7m cho t\u1eebng c\u00e2u tr\u1ea3 l\u1eddi. \u0110i\u1ec1u n\u00e0y gi\u00fap tr\u00e1nh \u0111\u01b0\u1ee3c sai s\u00f3t th\u01b0\u1eddng g\u1eb7p, \u0111\u00f3 l\u00e0 khi nh\u00e0 ph\u00e2n ph\u1ed1i ch\u1ec9 nh\u1eadn \u0111\u01b0\u1ee3c t\u00ean s\u1ea3n ph\u1ea9m ng\u1eafn g\u1ecdn, sau \u0111\u00f3 ph\u1ea3i t\u1ef1 \u0111o\u00e1n c\u00e1c y\u00eau c\u1ea7u v\u1ec1 kh\u00f4ng gian l\u1eafp \u0111\u1eb7t, c\u00e1p, ngu\u1ed3n \u0111i\u1ec7n, h\u1ec7 th\u1ed1ng \u0111i\u1ec1u khi\u1ec3n v\u00e0 d\u1ecbch v\u1ee5.<\/p>\n

\"Ki\u1ec3m<\/p>\n

Khi m\u00f4 h\u00ecnh SPE c\u1ee5 th\u1ec3 c\u00f3 li\u00ean quan, h\u00e3y tr\u00edch d\u1eabn n\u00f3 t\u1ea1i ph\u1ea7n th\u1ea3o lu\u1eadn v\u1ec1 quy\u1ebft \u0111\u1ecbnh \u0111\u00f3: Th\u00f4ng tin chi ti\u1ebft v\u1ec1 s\u1ea3n ph\u1ea9m SPE ph\u00f9 h\u1ee3p<\/a>. H\u00e3y m\u00f4 t\u1ea3 c\u1ee5 th\u1ec3 b\u1ed1i c\u1ea3nh c\u1ee7a c\u00e2u: x\u00e1c \u0111\u1ecbnh xem trang n\u00e0y \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho m\u1ed9t d\u00f2ng s\u1ea3n ph\u1ea9m, m\u1ed9t b\u1ea3n v\u1ebd \u0111\u00e3 \u0111\u01b0\u1ee3c c\u00f4ng b\u1ed1, m\u1ed9t h\u00ecnh \u1ea3nh hi\u1ec7n t\u1ea1i hay l\u00e0 \u0111i\u1ec3m kh\u1edfi \u0111\u1ea7u \u0111\u1ec3 l\u1eadp b\u00e1o gi\u00e1.<\/p>\n

H\u00e3y \u00e1p d\u1ee5ng nguy\u00ean t\u1eafc nh\u1ea5t qu\u00e1n khi c\u1eadp nh\u1eadt b\u00e0i vi\u1ebft. N\u1ebfu m\u1ed9t ti\u00eau chu\u1ea9n, quy \u0111\u1ecbnh, trang s\u1ea3n ph\u1ea9m ho\u1eb7c ph\u01b0\u01a1ng ph\u00e1p \u0111o l\u01b0\u1eddng c\u00f3 thay \u0111\u1ed5i, h\u00e3y c\u1eadp nh\u1eadt c\u00e2u v\u0103n v\u00e0 d\u00f2ng b\u1ea3ng li\u00ean quan thay v\u00ec ch\u1ec9 thay \u0111\u1ed5i ng\u00e0y th\u00e1ng. Ng\u01b0\u1eddi mua c\u1ea7n c\u00f3 th\u1ec3 nh\u1eadn bi\u1ebft \u0111\u01b0\u1ee3c th\u00f4ng tin n\u00e0o l\u00e0 m\u1edbi nh\u1ea5t v\u00e0 th\u00f4ng tin n\u00e0o v\u1eabn c\u1ea7n \u0111\u01b0\u1ee3c nh\u00e0 cung c\u1ea5p x\u00e1c nh\u1eadn.<\/p>\n\n\n\n\n\n\n\n\n
C\u00e2u h\u1ecfi<\/th>\nC\u00e1c ch\u1ee9ng c\u1ee9 c\u1ea7n y\u00eau c\u1ea7u<\/th>\nCh\u1ee7 s\u1edf h\u1eefu<\/th>\n<\/tr>\n<\/thead>\n
C\u00e2u h\u1ecfi<\/td>\nC\u00e1c ch\u1ee9ng c\u1ee9 c\u1ea7n y\u00eau c\u1ea7u<\/td>\nCh\u1ee7 s\u1edf h\u1eefu<\/td>\n<\/tr>\n
V\u1ecb tr\u00ed n\u00e0y c\u00f3 ph\u00f9 h\u1ee3p v\u1edbi \u0111\u1ecba \u0111i\u1ec3m t\u1ed5 ch\u1ee9c kh\u00f4ng?<\/td>\nM\u1eb7t b\u1eb1ng, kho\u1ea3ng c\u00e1ch v\u00e0 c\u00e1c l\u01b0u \u00fd v\u1ec1 l\u1ed1i v\u00e0o<\/td>\nNh\u00e0 thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng<\/td>\n<\/tr>\n
Qu\u00e1 tr\u00ecnh x\u1eed l\u00fd c\u00f3 \u0111\u01b0\u1ee3c ghi ch\u00e9p l\u1ea1i kh\u00f4ng?<\/td>\nB\u1ea3n ghi v\u1ec1 t\u1ea7n s\u1ed1 c\u1eaft, c\u1ef1c t\u00ednh v\u00e0 \u0111\u1ed9 tr\u1ec5<\/td>\nK\u1ef9 s\u01b0 v\u1eadn h\u00e0nh th\u1eed<\/td>\n<\/tr>\n
H\u1ea1m \u0111\u1ed9i c\u00f3 th\u1ec3 \u0111\u1ea3m nh\u1eadn nhi\u1ec7m v\u1ee5 n\u00e0y kh\u00f4ng?<\/td>\nDanh s\u00e1ch c\u00e1c b\u1ed9 ph\u1eadn, tr\u1ecdng l\u01b0\u1ee3ng v\u00e0 ph\u01b0\u01a1ng th\u1ee9c v\u1eadn chuy\u1ec3n<\/td>\nQu\u1ea3n l\u00fd cho thu\u00ea<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

M\u1ed9t h\u00e0nh \u0111\u1ed9ng ti\u1ebfp theo thi\u1ebft th\u1ef1c<\/h2>\n

Tr\u01b0\u1edbc khi ph\u00ea duy\u1ec7t, h\u00e3y so s\u00e1nh ph\u1ea3n h\u1ed3i c\u1ee7a nh\u00e0 cung c\u1ea5p v\u1edbi Yamaha Pro Audio<\/a>. N\u1ebfu ngu\u1ed3n l\u00e0 m\u1ed9t quy \u0111\u1ecbnh ho\u1eb7c t\u00e0i li\u1ec7u tham kh\u1ea3o v\u1ec1 an to\u00e0n, h\u00e3y tr\u00edch d\u1eabn ph\u1ea1m vi \u00e1p d\u1ee5ng c\u1ee7a n\u00f3 m\u1ed9t c\u00e1ch ch\u00ednh x\u00e1c v\u00e0 n\u00eau r\u00f5 ph\u1ea1m vi th\u1ea9m quy\u1ec1n. N\u1ebfu \u0111\u00f3 l\u00e0 m\u1ed9t h\u01b0\u1edbng d\u1eabn k\u1ef9 thu\u1eadt, h\u00e3y s\u1eed d\u1ee5ng n\u00f3 \u0111\u1ec3 gi\u1ea3i th\u00edch ph\u01b0\u01a1ng ph\u00e1p thay v\u00ec tr\u00ecnh b\u00e0y n\u00f3 nh\u01b0 m\u1ed9t ch\u1ee9ng nh\u1eadn s\u1ea3n ph\u1ea9m.<\/p>\n

H\u00ecnh \u1ea3nh th\u1ee9 hai \u0111\u01b0\u1ee3c \u0111\u1eb7t \u1edf \u0111\u00e2y v\u00ec n\u00f3 h\u1ed7 tr\u1ee3 cho quy\u1ebft \u0111\u1ecbnh trong ph\u1ea7n n\u00e0y, ch\u1ee9 kh\u00f4ng ph\u1ea3i v\u00ec m\u1ed7i ph\u1ea7n \u0111\u1ec1u c\u1ea7n c\u00f3 h\u00ecnh minh h\u1ecda. H\u00e3y \u0111\u1ea3m b\u1ea3o v\u0103n b\u1ea3n thay th\u1ebf (alt text) mang t\u00ednh m\u00f4 t\u1ea3 v\u00e0 gi\u1eef cho ID ph\u01b0\u01a1ng ti\u1ec7n \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi b\u1ea3n ghi b\u00e0i vi\u1ebft \u0111\u1ec3 ng\u01b0\u1eddi bi\u00ean t\u1eadp sau n\u00e0y c\u00f3 th\u1ec3 thay th\u1ebf n\u00f3 m\u00e0 kh\u00f4ng l\u00e0m m\u1ea5t d\u1ea5u v\u1ebft ki\u1ec3m tra.<\/p>\n

\u0110\u1ed1i v\u1edbi b\u00e0i ki\u1ec3m tra cu\u1ed1i c\u00f9ng, h\u00e3y s\u1eed d\u1ee5ng m\u1ed9t t\u00e0i li\u1ec7u tham kh\u1ea3o s\u00e2u h\u01a1n n\u1eefa v\u1ec1 SPE<\/a> trong \u0111o\u1ea1n v\u0103n n\u01a1i th\u1ef1c s\u1ef1 \u0111\u1ec1 c\u1eadp \u0111\u1ebfn d\u00f2ng s\u1ea3n ph\u1ea9m, th\u00e0nh ph\u1ea7n ho\u1eb7c \u1ee9ng d\u1ee5ng \u0111\u00f3. K\u1ebft th\u00fac b\u1eb1ng \u5982\u9700\u66f4\u6df1\u5165\u5730\u4e86\u89e3\u6545\u969c\u6392\u9664\uff0c\u8bf7\u67e5\u9605\u6765\u81ea<\/a> ch\u1ec9 khi ngu\u1ed3n \u0111\u00f3 c\u1ee7ng c\u1ed1 cho lu\u1eadn \u0111i\u1ec3m cu\u1ed1i c\u00f9ng; n\u1ebfu kh\u00f4ng, h\u00e3y thay th\u1ebf n\u00f3 b\u1eb1ng m\u1ed9t ngu\u1ed3n s\u01a1 c\u1ea5p ph\u00f9 h\u1ee3p h\u01a1n trong \u0111\u1ee3t r\u00e0 so\u00e1t n\u1ed9i dung ti\u1ebfp theo.<\/p>\n

Ng\u01b0\u1eddi mua n\u00ean k\u1ebft th\u00fac b\u00e0i vi\u1ebft b\u1eb1ng m\u1ed9t h\u00e0nh \u0111\u1ed9ng c\u1ee5 th\u1ec3 ti\u1ebfp theo: g\u1eedi b\u1ea3n v\u1ebd ph\u00f2ng, x\u00e1c nh\u1eadn danh s\u00e1ch \u0111\u1ea7u v\u00e0o\/\u0111\u1ea7u ra, ph\u00ea duy\u1ec7t m\u1eabu s\u1ea3n ph\u1ea9m, y\u00eau c\u1ea7u h\u1ed3 s\u01a1 tu\u00e2n th\u1ee7, \u0111\u1eb7t l\u1ecbch \u0111o \u0111\u1ea1c ho\u1eb7c y\u00eau c\u1ea7u b\u1ea3ng danh m\u1ee5c ph\u1ee5 t\u00f9ng thay th\u1ebf. H\u00e0nh \u0111\u1ed9ng n\u00e0y h\u1eefu \u00edch h\u01a1n so v\u1edbi m\u1ed9t \u0111o\u1ea1n v\u0103n chung chung ki\u1ec3u \u201cli\u00ean h\u1ec7 v\u1edbi ch\u00fang t\u00f4i\u201d v\u00ec n\u00f3 cho nh\u00e0 cung c\u1ea5p bi\u1ebft ch\u00ednh x\u00e1c th\u00f4ng tin n\u00e0o l\u00e0 c\u1ea7n thi\u1ebft \u0111\u1ec3 \u0111\u01b0a ra ph\u1ea3n h\u1ed3i ph\u00f9 h\u1ee3p.<\/p>\n

Gi\u00e1 tr\u1ecb th\u1ef1c ti\u1ec5n c\u1ee7a t\u00e0i li\u1ec7u h\u01b0\u1edbng d\u1eabn n\u00e0y n\u1eb1m \u1edf t\u00ednh truy xu\u1ea5t ngu\u1ed3n g\u1ed1c. Ngay c\u1ea3 nh\u1eefng ng\u01b0\u1eddi kh\u00f4ng tr\u1ef1c ti\u1ebfp so\u1ea1n th\u1ea3o b\u1ea3n y\u00eau c\u1ea7u b\u00e1o gi\u00e1 (RFQ) ban \u0111\u1ea7u c\u0169ng ph\u1ea3i c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c m\u1eabu s\u1ea3n ph\u1ea9m \u0111\u01b0\u1ee3c l\u1ef1a ch\u1ecdn, c\u00e1c ti\u00eau ch\u00ed so s\u00e1nh, b\u1eb1ng ch\u1ee9ng \u0111\u00e3 thu th\u1eadp \u0111\u01b0\u1ee3c v\u00e0 \u0111i\u1ec3m ki\u1ec3m tra ti\u1ebfp theo. Ch\u00ednh nh\u1edd \u0111i\u1ec1u \u0111\u00f3 m\u00e0 t\u00e0i li\u1ec7u n\u00e0y tr\u1edf n\u00ean h\u1eefu \u00edch \u0111\u1ed1i v\u1edbi c\u00e1c \u0111\u1ed9i ng\u0169 k\u1ef9 thu\u1eadt v\u00e0 mua h\u00e0ng, thay v\u00ec ch\u1ec9 l\u00e0 m\u1ed9t trang qu\u1ea3ng c\u00e1o chung chung.<\/p>\n

Khi m\u1ed9t d\u1ef1 \u00e1n c\u00f3 t\u00e1c \u0111\u1ed9ng \u0111\u1ebfn an to\u00e0n ho\u1eb7c tu\u00e2n th\u1ee7, h\u00e3y \u0111\u1ea3m b\u1ea3o ph\u1ea1m vi ngu\u1ed3n th\u00f4ng tin \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n r\u00f5 r\u00e0ng. V\u00ed d\u1ee5, c\u00e1c gi\u1edbi h\u1ea1n ti\u1ebfng \u1ed3n c\u1ee7a OSHA v\u00e0 NIOSH li\u00ean quan \u0111\u1ebfn m\u1ee9c ph\u01a1i nhi\u1ec5m t\u1ea1i n\u01a1i l\u00e0m vi\u1ec7c v\u00e0 kh\u00f4ng n\u00ean \u0111\u01b0\u1ee3c tr\u00ecnh b\u00e0y nh\u01b0 m\u1ed9t gi\u1edbi h\u1ea1n chung \u00e1p d\u1ee5ng cho c\u00e1c bu\u1ed5i h\u00f2a nh\u1ea1c hay kh\u00e1n gi\u1ea3. Quy t\u1eafc n\u00e0y c\u0169ng \u00e1p d\u1ee5ng cho t\u00e0i li\u1ec7u ch\u1ee9ng nh\u1eadn CE, kh\u1ea3 n\u0103ng t\u01b0\u01a1ng th\u00edch m\u1ea1ng v\u00e0 c\u00e1c tuy\u00ean b\u1ed1 v\u1ec1 hi\u1ec7u su\u1ea5t c\u1ee7a nh\u00e0 s\u1ea3n xu\u1ea5t: c\u1ea7n n\u00eau r\u00f5 ph\u1ea1m vi \u00e1p d\u1ee5ng v\u00e0 cung c\u1ea5p li\u00ean k\u1ebft \u0111\u1ebfn ngu\u1ed3n tham kh\u1ea3o.<\/p>\n

H\u00e3y l\u01b0u gi\u1eef b\u1ea3ng t\u1ed5ng k\u1ebft v\u00e0 ph\u1ea3n h\u1ed3i c\u1ee7a nh\u00e0 cung c\u1ea5p c\u00f9ng nhau. Khi m\u1ed9t kh\u00e1ch h\u00e0ng sau n\u00e0y h\u1ecfi l\u00fd do t\u1ea1i sao l\u1ea1i ch\u1ecdn m\u1ed9t m\u1eabu s\u1ea3n ph\u1ea9m c\u1ee5 th\u1ec3, c\u00e2u tr\u1ea3 l\u1eddi ph\u1ea3i \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n r\u00f5 r\u00e0ng trong c\u00f9ng m\u1ed9t h\u1ed3 s\u01a1: ph\u1ea1m vi \u1ee9ng d\u1ee5ng, b\u1eb1ng ch\u1ee9ng, gi\u1ea3 \u0111\u1ecbnh m\u1edf, ng\u01b0\u1eddi ch\u1ecbu tr\u00e1ch nhi\u1ec7m v\u00e0 h\u00e0nh \u0111\u1ed9ng ti\u1ebfp theo. Th\u00f3i quen nh\u1ecf n\u00e0y gi\u00fap gi\u1ea3m thi\u1ec3u vi\u1ec7c l\u00e0m l\u1ea1i v\u00e0 \u0111\u1ea3m b\u1ea3o t\u00ednh nh\u1ea5t qu\u00e1n trong c\u00e1c l\u1ea7n mua h\u00e0ng ti\u1ebfp theo.<\/p>\n

N\u1ebfu th\u00f4ng tin ch\u01b0a c\u00f3 s\u1eb5n, h\u00e3y n\u00f3i r\u00f5 \u0111i\u1ec1u \u0111\u00f3. C\u1ee5m t\u1eeb \u201cCh\u1edd x\u00e1c nh\u1eadn t\u1eeb nh\u00e0 cung c\u1ea5p\u201d \u0111\u00e1ng tin c\u1eady h\u01a1n m\u1ed9t con s\u1ed1 tr\u00f4ng c\u00f3 v\u1ebb ch\u00ednh x\u00e1c nh\u01b0ng l\u1ea1i kh\u00f4ng k\u00e8m theo \u0111i\u1ec1u ki\u1ec7n th\u1eed nghi\u1ec7m. \u0110i\u1ec1u n\u00e0y c\u0169ng gi\u00fap ng\u01b0\u1eddi ti\u1ebfp theo n\u1eafm r\u00f5 nhi\u1ec7m v\u1ee5 c\u1ee7a m\u00ecnh v\u00e0 tr\u00e1nh vi\u1ec7c sao ch\u00e9p m\u1ed9t gi\u1ea3 \u0111\u1ecbnh c\u0169 v\u00e0o b\u00e1o gi\u00e1 m\u1edbi.<\/p>\n

C\u00e1c b\u01b0\u1edbc ki\u1ec3m tra b\u1ed5 sung d\u00e0nh cho ng\u01b0\u1eddi mua<\/h2>\n

\u0110\u1eebng coi tuy\u00ean b\u1ed1 c\u1ee7a nh\u00e0 s\u1ea3n xu\u1ea5t l\u00e0 k\u1ebft qu\u1ea3 \u0111\u1ea3m b\u1ea3o c\u1ee7a d\u1ef1 \u00e1n. M\u1ed7i gi\u00e1 tr\u1ecb trong b\u1ea3ng th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt \u0111\u1ec1u \u0111i k\u00e8m v\u1edbi ph\u01b0\u01a1ng ph\u00e1p \u0111o l\u01b0\u1eddng, dung sai, d\u1ea3i t\u1ea7n, kho\u1ea3ng c\u00e1ch ho\u1eb7c \u0111i\u1ec1u ki\u1ec7n ho\u1ea1t \u0111\u1ed9ng c\u1ee5 th\u1ec3. H\u00e3y ghi ch\u00fa c\u00e1c \u0111i\u1ec1u ki\u1ec7n \u0111\u00f3 b\u00ean c\u1ea1nh con s\u1ed1 t\u01b0\u01a1ng \u1ee9ng. N\u1ebfu thi\u1ebfu th\u00f4ng tin v\u1ec1 \u0111i\u1ec1u ki\u1ec7n, h\u00e3y ghi \u201cc\u1ea7n c\u00f3 x\u00e1c nh\u1eadn t\u1eeb nh\u00e0 cung c\u1ea5p\u201d v\u00e0 kh\u00f4ng \u0111\u01b0a con s\u1ed1 \u0111\u00f3 v\u00e0o cam k\u1ebft ch\u1ea5p nh\u1eadn cho \u0111\u1ebfn khi ph\u01b0\u01a1ng ph\u00e1p th\u1eed nghi\u1ec7m \u0111\u01b0\u1ee3c th\u1ed1ng nh\u1ea5t.<\/p>\n

\u0110\u1ed9i ng\u0169 mua h\u00e0ng c\u0169ng n\u00ean h\u1ecfi r\u00f5 nh\u1eefng g\u00ec kh\u00f4ng \u0111\u01b0\u1ee3c bao g\u1ed3m. C\u00e1c h\u1ea1ng m\u1ee5c nh\u01b0 c\u00e1p, gi\u00e1 \u0111\u1ee1, b\u1ed9 chuy\u1ec3n m\u1ea1ch m\u1ea1ng, gi\u1ea5y ph\u00e9p DSP, c\u00e0i \u0111\u1eb7t s\u1eb5n, thi\u1ebft b\u1ecb ch\u1ed1ng th\u1eddi ti\u1ebft, tr\u00ecnh \u0111i\u1ec1u khi\u1ec3n d\u1ef1 ph\u00f2ng v\u00e0 kh\u00f3a \u0111\u00e0o t\u1ea1o c\u00f3 th\u1ec3 kh\u00f4ng \u0111\u01b0\u1ee3c li\u1ec7t k\u00ea trong b\u00e1o gi\u00e1 s\u1ea3n ph\u1ea9m s\u01a1 b\u1ed9. Vi\u1ec7c li\u1ec7t k\u00ea c\u00e1c h\u1ea1ng m\u1ee5c kh\u00f4ng bao g\u1ed3m ngay t\u1eeb \u0111\u1ea7u s\u1ebd gi\u00fap t\u1ed5ng chi ph\u00ed d\u1ef1 \u00e1n d\u1ec5 so s\u00e1nh h\u01a1n v\u00e0 gi\u1ea3m thi\u1ec3u nguy c\u01a1 nh\u00e0 t\u00edch h\u1ee3p ph\u00e1t hi\u1ec7n ra m\u1ed9t h\u1ea1ng m\u1ee5c thi\u1ebft y\u1ebfu sau khi \u0111\u01a1n \u0111\u1eb7t h\u00e0ng \u0111\u00e3 \u0111\u01b0\u1ee3c ph\u00e1t h\u00e0nh.<\/p>\n

\u0110\u1ed1i v\u1edbi \u0111\u01a1n h\u00e0ng \u0111\u1eb7t l\u1ea1i, h\u00e3y c\u1ed1 \u0111\u1ecbnh c\u1ea5u h\u00ecnh \u0111\u00e3 \u0111\u01b0\u1ee3c ph\u00ea duy\u1ec7t. Ghi l\u1ea1i m\u00e3 m\u1eabu, phi\u00ean b\u1ea3n, b\u1ea3n thi\u1ebft k\u1ebf nh\u00e3n, t\u00f9y ch\u1ecdn \u0111\u1ea7u n\u1ed1i, l\u1edbp ho\u00e0n thi\u1ec7n, phi\u00ean b\u1ea3n ph\u1ea7n m\u1ec1m nh\u00fang ho\u1eb7c phi\u00ean b\u1ea3n c\u00e0i \u0111\u1eb7t s\u1eb5n, c\u00f9ng b\u1ea5t k\u1ef3 s\u1ef1 thay th\u1ebf n\u00e0o \u0111\u00e3 \u0111\u01b0\u1ee3c ph\u00ea duy\u1ec7t. M\u1ed9t ghi ch\u00fa nh\u1ecf v\u1ec1 ki\u1ec3m so\u00e1t thay \u0111\u1ed5i s\u1ebd b\u1ea3o v\u1ec7 c\u1ea3 ng\u01b0\u1eddi mua v\u00e0 nh\u00e0 cung c\u1ea5p khi \u0111\u01a1n h\u00e0ng ti\u1ebfp theo \u0111\u01b0\u1ee3c \u0111\u1eb7t v\u00e0i th\u00e1ng sau \u0111\u00f3 v\u00e0 nh\u00f3m d\u1ef1 \u00e1n ban \u0111\u1ea7u kh\u00f4ng c\u00f2n tham gia n\u1eefa.<\/p>\n

H\u00e3y s\u1eed d\u1ee5ng m\u1ed9t \u0111i\u1ec3m ki\u1ec3m tra \u0111\u01b0\u1ee3c \u0111\u1eb7t t\u00ean cho m\u1ed7i b\u01b0\u1edbc \u0111i\u1ec1u ch\u1ec9nh quan tr\u1ecdng. Tr\u00ean m\u1ed9t h\u1ec7 th\u1ed1ng con, \u0111\u00f3 c\u00f3 th\u1ec3 l\u00e0 \u0111\u1ea7u ra c\u1ee7a b\u1ed9 tr\u1ed9n, \u0111\u1ea7u v\u00e0o DSP, k\u00eanh b\u1ed9 khu\u1ebfch \u0111\u1ea1i, \u0111\u1ea7u n\u1ed1i loa, lu\u1ed3ng m\u1ea1ng ho\u1eb7c v\u1ecb tr\u00ed nghe. B\u1ea3n ghi c\u1ea7n n\u00eau r\u00f5 t\u00edn hi\u1ec7u, \u0111\u1ed3ng h\u1ed3 \u0111o, m\u1ee9c tham chi\u1ebfu v\u00e0 k\u1ebft qu\u1ea3 quan s\u00e1t d\u1ef1 ki\u1ebfn. Nh\u1edd \u0111\u00f3, k\u1ef9 thu\u1eadt vi\u00ean sau n\u00e0y c\u00f3 th\u1ec3 t\u00e1i hi\u1ec7n l\u1ea1i qu\u00e1 tr\u00ecnh ki\u1ec3m tra thay v\u00ec ph\u1ea3i d\u1ef1a v\u00e0o tr\u00ed nh\u1edb ho\u1eb7c m\u1ed9t \u1ea3nh ch\u1ee5p m\u00e0n h\u00ecnh thi\u1ebfu b\u1ed1i c\u1ea3nh.<\/p>\n

Vi\u1ec7c ch\u1ea1y th\u1eed n\u00ean \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n theo t\u1eebng giai \u0111o\u1ea1n thay v\u00ec \u0111\u1ec3 \u0111\u1ebfn chi\u1ec1u ng\u00e0y cu\u1ed1i c\u00f9ng. Tr\u01b0\u1edbc ti\u00ean, h\u00e3y x\u00e1c nh\u1eadn l\u1ea1i h\u1ec7 th\u1ed1ng d\u00e2y d\u1eabn v\u00e0 c\u1ef1c t\u00ednh, sau \u0111\u00f3 t\u1ea3i c\u00e1c ch\u01b0\u01a1ng tr\u00ecnh x\u1eed l\u00fd \u0111\u00e3 \u0111\u01b0\u1ee3c ph\u00ea duy\u1ec7t, ti\u1ebfp theo l\u00e0 thi\u1ebft l\u1eadp c\u00e1c m\u1ee9c ho\u1ea1t \u0111\u1ed9ng, r\u1ed3i nghe th\u1eed ho\u1eb7c \u0111o \u0111\u1ea1c t\u1ea1i c\u00e1c \u0111i\u1ec3m \u0111\u00e3 th\u1ecfa thu\u1eadn. N\u1ebfu m\u1ed9t giai \u0111o\u1ea1n n\u00e0o \u0111\u00f3 kh\u00f4ng \u0111\u1ea1t y\u00eau c\u1ea7u, h\u00e3y kh\u1eafc ph\u1ee5c tr\u01b0\u1edbc khi chuy\u1ec3n sang giai \u0111o\u1ea1n ti\u1ebfp theo. Tr\u00ecnh t\u1ef1 n\u00e0y gi\u00fap d\u1ec5 d\u00e0ng x\u00e1c \u0111\u1ecbnh nguy\u00ean nh\u00e2n g\u00e2y ra hi\u1ec7n t\u01b0\u1ee3ng k\u1ebft n\u1ed1i k\u00e9m, dao \u0111\u1ed9ng qu\u00e1 m\u1ee9c ho\u1eb7c thi\u1ebft b\u1ecb kh\u00f4ng th\u1ec3 s\u1eed d\u1ee5ng, \u0111\u1ed3ng th\u1eddi ng\u0103n ch\u1eb7n nh\u1eefng l\u1ed7i l\u1eafp \u0111\u1eb7t nh\u1ecf tr\u1edf th\u00e0nh tranh c\u00e3i m\u01a1 h\u1ed3 v\u1ec1 \u201cch\u1ea5t l\u01b0\u1ee3ng \u00e2m thanh\u201d.<\/p>\n

Danh s\u00e1ch ki\u1ec3m tra t\u1ea1i hi\u1ec7n tr\u01b0\u1eddng<\/h2>\n

Danh s\u00e1ch ki\u1ec3m tra hi\u1ec7n tr\u01b0\u1eddng c\u1ea7n \u0111\u01b0\u1ee3c ghi l\u1ea1i d\u01b0\u1edbi d\u1ea1ng m\u1ed9t b\u1ea3n ghi ch\u00fa ng\u1eafn v\u1ec1 d\u1ef1 \u00e1n: m\u1eabu v\u00e0 phi\u00ean b\u1ea3n s\u1eeda \u0111\u1ed5i, b\u1eb1ng ch\u1ee9ng \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u, ng\u01b0\u1eddi ch\u1ecbu tr\u00e1ch nhi\u1ec7m, ng\u00e0y th\u00e1ng, gi\u1ea3 \u0111\u1ecbnh ch\u01b0a \u0111\u01b0\u1ee3c x\u00e1c minh v\u00e0 h\u00e0nh \u0111\u1ed9ng ti\u1ebfp theo. N\u1ebfu k\u1ebft qu\u1ea3 ph\u1ee5 thu\u1ed9c v\u00e0o s\u1ed1 \u0111o ph\u00f2ng, ki\u1ec3m tra t\u1ea1i nh\u00e0 m\u00e1y ho\u1eb7c h\u1ed3 s\u01a1 tu\u00e2n th\u1ee7 hi\u1ec7n t\u1ea1i, h\u00e3y \u0111\u1ec3 m\u1ee5c \u0111\u00f3 \u1edf tr\u1ea1ng th\u00e1i \u201cch\u01b0a x\u00e1c minh\u201d cho \u0111\u1ebfn khi nh\u1eadn \u0111\u01b0\u1ee3c b\u1eb1ng ch\u1ee9ng, thay v\u00ec bi\u1ebfn gi\u1ea3 \u0111\u1ecbnh \u0111\u00f3 th\u00e0nh m\u1ed9t kh\u1eb3ng \u0111\u1ecbnh.<\/p>\n

H\u00e3y g\u1eedi cho SPE Audio th\u00f4ng tin v\u1ec1 \u1ee9ng d\u1ee5ng, s\u1ed1 l\u01b0\u1ee3ng, th\u1ecb tr\u01b0\u1eddng m\u1ee5c ti\u00eau, \u0111i\u1ec1u ki\u1ec7n l\u1eafp \u0111\u1eb7t ho\u1eb7c l\u01b0u di\u1ec5n, ti\u00eau chu\u1ea9n ngu\u1ed3n \u0111i\u1ec7n, nhu c\u1ea7u v\u1ec1 th\u01b0\u01a1ng hi\u1ec7u v\u00e0 c\u00e1c t\u00e0i li\u1ec7u c\u1ea7n thi\u1ebft. B\u1ea3n t\u00f3m t\u1eaft n\u00e0y s\u1ebd cung c\u1ea5p cho nh\u00e0 cung c\u1ea5p \u0111\u1ee7 b\u1ed1i c\u1ea3nh \u0111\u1ec3 \u0111\u01b0a ra m\u1ed9t \u0111\u1ec1 xu\u1ea5t ph\u00f9 h\u1ee3p m\u00e0 kh\u00f4ng b\u1eaft ng\u01b0\u1eddi mua ph\u1ea3i t\u1ef1 gi\u1ea3i th\u00edch c\u00e1c n\u1ed9i dung ti\u1ebfp th\u1ecb chung chung.<\/p>","protected":false},"excerpt":{"rendered":"

Subwoofer procurement is a system decision. Cabinet size, placement, crossover, polarity, transport and amplifier strategy affect each other, so a buyer needs a method that can be checked after delivery. This article targets the subwoofer polarity phase alignment test query with a engineering angle for system technician. It is written for a buyer who needs […]<\/p>\n","protected":false},"author":1,"featured_media":2503,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23],"tags":[],"class_list":["post-4045","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"_links":{"self":[{"href":"https:\/\/spe-audio.com\/vi\/wp-json\/wp\/v2\/posts\/4045","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/spe-audio.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/spe-audio.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/spe-audio.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/spe-audio.com\/vi\/wp-json\/wp\/v2\/comments?post=4045"}],"version-history":[{"count":3,"href":"https:\/\/spe-audio.com\/vi\/wp-json\/wp\/v2\/posts\/4045\/revisions"}],"predecessor-version":[{"id":4192,"href":"https:\/\/spe-audio.com\/vi\/wp-json\/wp\/v2\/posts\/4045\/revisions\/4192"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/spe-audio.com\/vi\/wp-json\/wp\/v2\/media\/2503"}],"wp:attachment":[{"href":"https:\/\/spe-audio.com\/vi\/wp-json\/wp\/v2\/media?parent=4045"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/spe-audio.com\/vi\/wp-json\/wp\/v2\/categories?post=4045"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/spe-audio.com\/vi\/wp-json\/wp\/v2\/tags?post=4045"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}