4 Ohms Speakers on Beomaster 4500 or Beocenter 9300 Roth Beolink-Active

9 replies
CY
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Cyberpunk
Bronze
Posted February 4, 2023 at 05:59 GMT
#1641883
Hello Friends of Vintage B&O,

I would like to use modern 4ohm speakers with my above mentioned equipment.

the internal amplifier of These are always mentioned with 8 ohms, but no mention of a 4 ohm compatibility.

 

this might mean that these ARE 8 ohms amplifiers.

surprisingly, i did not find any forum thread clearing this question

mostly some writers actes as forum trolls, bringing these threads in the direction of „use B&O speakers“, this-Sounds-Berger-than-that, etc.

 

so please dont repeat this circle - is there a technical competent Melker which can provide clear answers?

 

probably all the 3 devices might use the same amplifier, but this is not the point to clear up.

probably someone can identify the transistors used in the circuit, and bring answers from this fact.

thank you in advance
CY
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Cyberpunk
Bronze
Posted February 4, 2023 at 18:05 GMT
#1653464
Sorry for the typos, produced by my automatic german typing-correction,

i just could not realize them on the small phone screen…

 

it means:

…or… beolink active

…sounds better…

Melker (funny) means MEMBER

 

 

 
Guy
Online
Guy
GoldModerator
Posted February 5, 2023 at 05:54 GMT
#1653471
Although I am not sure that it was fitted with the same amplifier, I used 4 ohm Grundig Audiorama 8000s with my Beocenter 9500 extensively, with no problems. Although someone may be along to give a technical recommendation, I would simply keep volume levels low when initially testing.

Location: Warwickshire, UK

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Mark-sf
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Mark-sf
Bronze
Posted February 7, 2023 at 18:28 GMT
#1653521
In reality, dynamic speakers are only nominally 4 or 8  ohms. They vary their impedance with frequency. A manufacturer rates an amp’s power into a load. Therefore as the load goes from 8 to 4 an amp must deliver more current to support the voltage needed to drive the speaker. If the amp cannot its voltage will drop which reduces its watts. This just means if both an 8 and 4 ohm pair had the same sensitivity you could play the 8 ohm louder. Both will still work. Simply turn the volume down if you hear distortion from any speaker regardless of its rating.
CY
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Cyberpunk
Bronze
Posted March 10, 2023 at 10:22 GMT
#1654441
And how would you See my attempt to use „bi-amping“ with a (nominal) 4 Ohm speaker which offer a Dual Terminal, Split Intro high and low frequency connectors:

 

i would use each 1 of the 4500 or 9300‘s speaker Outputs with One of the terminals, which might get each pair closer to the 8 ohms target…?

 

so the amp would Drive 2pairs of speakers wich really Are 1 pair…?

regards
Mark-sf
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Mark-sf
Bronze
Posted March 10, 2023 at 18:43 GMT
#1654465
I would not connect your speakers that way. Simply run one set of speaker wires and use the jumpers on your speaker terminals. You cannot bi-amp with a single amplifier. What you are proposing is ‘bi-wiring” and it’s not likely to benefit given the speaker switches and DIN connections.
Ninni
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Ninni
Bronze
Posted March 17, 2023 at 21:15 GMT
#1654705
You shouldn't run the full range signal from the amplifier into the tweeter terminals, unless the loudspeaker has built-in crossover filter for the tweeter. If it has separate connectors for the high and low register, that indicates the contrary. Then it's probably designed for active filters and biamping.
Mark-sf
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Mark-sf
Bronze
Posted March 17, 2023 at 23:18 GMT
#1654710
Ninni, virtually all speakers that provide for two separate pairs of binding posts also include internal crossovers and jumpers and to bridge the two inputs to use a single pair of wires. True bi-amplified speakers without internal or included amps are predominantly a DIY offering.
KR
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kronzilla
Bronze
Posted December 13, 2023 at 01:00 GMT
#1660859
If you search as example in the beomaster 3500/4500 manual, they describe ONLY use 8 ohm speakers. In the long therm the amp and other components will fail due the higher current with  4 ohm speakers. I would stick to 8 ohm for that reason.
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