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The 5k USD , Boston acoustics lynnfield 500L *Review*
- Thread starter muziekfreak
- Start date
Now I know. Thanks.
I suppose a GED is a fairly basic educational standard, so the quote below seems a bit odd.
Now I know. Thanks.
I suppose a GED is a fairly basic educational standard, so the quote below seems a bit odd.
I understood him* to mean someone with more "credentials" than a GED.
*even if I don't agree with his views
He said the T1030s could not even be compared with the Lynnfield 500L, but I did just that and preferred the T1030s.
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Yes, that would make sense.
What's GED?
In the words of Comedian Chris Rock (who has a GED) -
Good Enough Diploma.
I don't suppose anyone who owns the 400L or 500L that has commented in this thread, has the ability to test the inductors on the crossover for the millihenrys? There are 4 on the upper (main) part of the crossover, the largest one on my 400L's have a melted bobbin, though both coils do read the same DCR of .40 ohms.
I've had these speakers for a long time sitting here waiting to be repaired, I'm down to the inductor and a couple resistors that were cracked in half.
If anyone has any information on the crossover, or the inductors themselves, would be greatly appreciated. I do not have the proper equipment to test the ones I have, to be able to order replacements.
I've had these speakers for a long time sitting here waiting to be repaired, I'm down to the inductor and a couple resistors that were cracked in half.
If anyone has any information on the crossover, or the inductors themselves, would be greatly appreciated. I do not have the proper equipment to test the ones I have, to be able to order replacements.
Unfornatully, they do not want to share the filter... I already asked. I have also to refurbish mine, one 400L owner helped though but do not know about the Henry measurement of the coils.
I have not measured the coils of my 400L as I have not the device to do so. The bigger one you are talking is the parralel one on the midrange, i.e. the high-pass coil of the second order filter.
There are different filters values according the tweeter and the loudspeaker serial number (corrections made after Stereophile review) as we saw with the gentleman 400L owner than helped me by pm. Maybe it was also the case for the medium filter ? What are the caps values of the two yellow serie lythics caps on yours as the shunt one on the second coil ? Seems the big coil was hand wounded, so not a standard value.
If the mid and woofers are ok, the loudspeakers can be saved even if the tweeters are burned....
The drivers are the same than the 500L. Filter of the mid and tweeter probably the same, the 500L II was said to sound better with new filter values... they also added some 0.1 MIT RTX bypass on all the caps too. 5 units per loudspeaker.
The op has some GED as he redo the tweeter filter
... maybe he can help you !
I have not measured the coils of my 400L as I have not the device to do so. The bigger one you are talking is the parralel one on the midrange, i.e. the high-pass coil of the second order filter.
There are different filters values according the tweeter and the loudspeaker serial number (corrections made after Stereophile review) as we saw with the gentleman 400L owner than helped me by pm. Maybe it was also the case for the medium filter ? What are the caps values of the two yellow serie lythics caps on yours as the shunt one on the second coil ? Seems the big coil was hand wounded, so not a standard value.
If the mid and woofers are ok, the loudspeakers can be saved even if the tweeters are burned....
The drivers are the same than the 500L. Filter of the mid and tweeter probably the same, the 500L II was said to sound better with new filter values... they also added some 0.1 MIT RTX bypass on all the caps too. 5 units per loudspeaker.
The op has some GED as he redo the tweeter filter
... maybe he can help you !
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Nabnassett
Well-Known Member
After reading the 1st paragraph it became evident that I possess neither the understanding or intellect to fathom the subject matter that followed.
Pretty pictures though...
Pretty pictures though...
My 400Ls have those .1 MIT caps, I replaced them all with new Audyn .1uf poly's. Since I really don't design crossovers, to me, the .1uf caps seem fairly pointless, as what I see are capacitors being paralelled to equal a larger total value, in a crossover that was designed with 20% tolerance electrolytics (which I also swapped out for polys, except the 200uf, because it was just too damn big to put anywhere in the cabinet). Nonetheless, since I prefer exactness and original intent (flaws too), I kept the .1ufs in the circuit.
I found the rtx very usefull as they not also add clearness but also a warm and snapp on the mid and bass section. more discutable in the tweeter section... but was usefull with the yellow original mylars. I quite have a problem with the tweeter filter after having trying several poly but also different mylars... this is the weak spot on this loudspeaker : mainly the 14 uF !
Btw, the MIT has to be soldered and desoldered very carefully : leads are fragile and polystyren does not like too much hot : you need to work fast with them.
Btw, the MIT has to be soldered and desoldered very carefully : leads are fragile and polystyren does not like too much hot : you need to work fast with them.
sislane
New Member
Very interesting.