tu nekolik myslenek courtesy of neumann (klein & hummel):

"Do I need to “burn-in” / “run-in” my loudspeakers?

Let us think about what parts can change their properties permanently in an active loudspeaker:

Electronics – There is insignificant change with use over time. Permanent changes are usually the result of poor parts selection in design, early parts failure (bathtub curve), or user abuse. Some temporary change over short periods is seen due to heating up of components, but this resets when the electronics cools down. Active loudspeakers do not suffer significantly from these temporary changes as the sensitive crossover parts are positioned before the amplifier and so do not heat up much.

Cabinet Mechanics – If this changes it is not well built!

Drivers – The moving mass cannot change otherwise it means that something has fallen off, or some extra mass has been added. The self-damping should not change significantly otherwise it would mean that the cone material is falling apart. These two situations would only happen in the case of loudspeaker abuse or accidental damage. The suspension and surround can change their stiffness over time; however a good design should be robust to these minor changes. Even quite large, and highly unlikely in a correctly working loudspeaker, changes (doubling or halving the stiffness) will alter the overall loudspeaker performance by less than 1 dB in the low-frequency region only. Temporary changes are seen due to the voice coil heating up (thermal compression), but this resets when it cools down.

Psychoacoustics – A human's auditory memory is VERY short, less than five seconds. This fact is well-known in the academic community, so one sees controlled ABX type listening tests with fast switchers to avoid the listeners forgetting what they just heard. Typically when burning-in loudspeakers a user listens to the loudspeaker for a while, does the burn-in over a long time period (say 24 hours, or even up to a week), then listens again. Having done this they are naturally inclined to hear a difference.

Our decades of experience in servicing products has shown that products which have been in normal use for many years typically have less than 0.5 dB of variance compared to specification. The largest source of variance is seen when drivers have been replaced, therefore recalibration to production standards is advised after servicing. If the long-term specification is stable, the short-term specification should also be stable.

Concluding, burning-in loudspeakers came from the past when poorly-designed passive systems were common. Today we have well-designed active solutions that can be used straight out of the box. To take an analogy from the automotive industry: cars used to require a running-in period of 500 miles (800 km), these days it is not required."

zdroj: http://www.sennheiser.com/neumann-kh/ho ... _question8

prijde mi to logicky napsany. stejne si ale myslim, ze na rozehrani beden precejen neco malinko je, ze to neni jen povera. ale asi je jasny, ze se spis jedna o nuance a zadna vyrazna zmena v prednesu by nemela nastat.

tie rozdiely su MERATELNE. nejde o ziadny mytus... samozrejme pre jeden druh menicov to moze byt vyznamnejsie ako pre iny

Concluding, burning-in loudspeakers came from the past when poorly-designed passive systems were common. Today we have well-designed active solutions that can be used straight out of the box. To take an analogy from the automotive industry: cars used to require a running-in period of 500 miles (800 km), these days it is not required

toto je myslim klucova vec na tom celom...

Jen dve poznamky:
1) jak rika kexik, mozna to je nekde znat vic a nekde min, ale zatim u vsech beden, co mi prosly rukama, ten rozdil byl normalne slyset; a svym usim verim vic, nez clanku, at uz ho psal kdokoliv
2) trochu OT, ale... K tomu autu - zrovna nedavno jsem cetl rozhovor s sefkonstrukterem VW a ten tvrdil, ze nechape, kde lidi prisli na to, ze motor neni treba zabihat. Neni uz treba zabihat tak dlouho, vyrobni procesy jsou presnejsi, pouzivaji se nove materialy, atd., ale zabihat se musi stale, protoze tolerance existuji porad. To jen tak na okraj.

dendy píše:Concluding, burning-in loudspeakers came from the past when poorly-designed passive systems were common. Today we have well-designed active solutions that can be used straight out of the box. To take an analogy from the automotive industry: cars used to require a running-in period of 500 miles (800 km), these days it is not required

toto je myslim klucova vec na tom celom...

mno, tohle podotkl kamarad - mnohy novy auto vyrobce doporucuje 'zabehnout', takze prirovnani dost kulha.

Mám stejnou zkušenost jako Kermitak.

ja jsem si zadnyho rozdilu nevsim ani u Truthu ani u Adamu. Meritelny to mozna je, ale pokud clovek na tech bednach dela porad a nema vedle sebe novej a pouzivanej kus, tak imho nema sanci neco poznat. Nevim, podle me to v praxi clovek nemusi moc resit, stejne ty bedny musi par mesicu naposlouchat.

ked som kupil auto nove , tak mi povedali ze mam jazdit tak ako normalne .. ze nemam nijak specialne auto "zahorovat" ...