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Altec 403A
Altec 403A
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Old 11th October 2017, 03:53 PM   #1
opa1 is offline opa1  United States
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Default Altec 403A

I just bought a pair of Altec 403A's. Has anyone here tried them? I'm hoping they are somewhat similar to the 755. Thought about putting them in the 618 cabs to try them out.
JELabs/WE type enclosure.
WE/Altec 755 Part 2 (2 cf box)
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Old 11th October 2017, 04:13 PM   #2
freddi is offline freddi  United States
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Altec 403A
I shouldn't comment as not hearing one - but they sure sound great on these videos YouTube
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Old 11th October 2017, 04:14 PM   #3
Cal Weldon is offline Cal Weldon  Canada
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Altec 403A
They look like the 409 minus the tweeter. I haven't heard the 403 but would guess it's a step down from the 755. Maybe someone like Pano or GM have heard and can comment.
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Old 11th October 2017, 04:45 PM   #4
opa1 is offline opa1  United States
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Here they are in 618 cabs. YouTube

I'm sure they are a step or two down from the 755A/C/E.
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Old 11th October 2017, 04:56 PM   #5
GM is offline GM  United States
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The 755 was rated 40-15 kHz/20 W, 92 dB/4 ft, while the 403 was 70-11 kHz/12 W, 99 dB/4ft, so quite a bit different overall.

While Altec rated the ~2.3 ft^3 618 for any then current 8" drivers, the larger ~3 ft^3 614 is a bit better fit for the 403's different specs [higher Qts IIRC].

Strictly PA/Muzak/AM radio replacement speaker IMO, so for HIFI, best as a OB/IB mid in a large HE three way monitor, preferably with a thin felt or cotton ball 'dust cap'/diffuser and driven with a high output impedance [low DF] SET.

GM
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Old 11th October 2017, 05:17 PM   #6
opa1 is offline opa1  United States
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I will be using these with 2A3 SET. From GM's specs it looks like it might need a simple tweeter/cap to fill in the top. Although with my limited HF hearing I probably wouldn't hear the difference.
The 614 is a ported cab. Would it be better built sealed for the 403?
I really want to keep these simple, mid range listening. These will also be in a smaller room.

BTW, Good hearing from you GM. Haven't talked since the Betsy cabs.

Last edited by opa1; 11th October 2017 at 05:26 PM.
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Old 11th October 2017, 06:55 PM   #7
GM is offline GM  United States
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Ah! I was trying to remember where/what speakers we had discussed.

Well, I used one in a pre WWII open back AM/shortwave console [~8 ft^3 IIRC] and it barely did AM's 5 kHz BW better than a 1960 AM clock radio with a 5" driver [both SET driven], though the LF was much 'fuller', which was all I cared about, i.e. I thought Stevie Wonder was a young girl until I heard 'Fingertips' on the console.

Anyway, based on this I personally would try the largest sealed cab I could 'afford' and if it sounded too small, then I'd do ~aperiodic.

GM
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Last edited by GM; 11th October 2017 at 06:58 PM.
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Old 11th October 2017, 07:18 PM   #8
opa1 is offline opa1  United States
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That's one hell of a description! I hope they do better than that. The drivers arrived today. So I'll stick them on some cheap OSB 2x4 OB's and see what they sound like. Then move on from there.
Thanks for the info.

MK
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Old 11th October 2017, 07:52 PM   #9
GM is offline GM  United States
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Hope so too! Mine was an old one the local distributor gave me, though except for some dust looked brand new. Regardless, looking forward to your impressions.

GM
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Old 12th October 2017, 04:22 AM   #10
opa1 is offline opa1  United States
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This pair looks to be NOS. They actually work very well in OB. I'm impressed. Now I'm not sure if I want to box them.
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