Boston Acoustics (India) sells two identically designed 8 inches - 4 and 8 ohm full range speakers which is very cheap, only Rs. 1250 per pair (usd 19 equivalent). They have QTS of 1.763 and 1.275. I bought the 8 ohm ones and am now using it in an open baffle as designed by M.J.King with two h-frame eminence alpha 15a subwoofers. I like the sound very much. I am using a chinese single ended tube amp - el34 hifi exquis (Old Chen BL-01 label) which is supposed to be 10w bought from Aliexpress. The amp has both 4ohm and 8ohm speaker output leads.
Because(i believe) of my active crossover using minidsp 2x4, which has 2vrms input and .9vrms output, I found the volume is not loud enough for some low volume sources. I have a look at the 4ohm speaker and found that the sensitivity(SPL) is more at 97db at 2.83v as opposed to 93db for the 8 ohm one.
My question is will the 4ohms speaker give me louder volume? Will there be any problems with the SET amp on using 4ohm speaker?
I am a begginner. Any help would be appreciated.
The TS parameters for them are attached below.
The links for the details are also given below:
4ohm - Boston Acoustics - HQ48413P - 8" Hi-Q Fullrange Driver - 4 Ohms - Pair
8ohm - Boston Acoustics - HQ48414P - 8" Hi-Q Fullrange Driver - 8 Ohms - Pair
Regards & Cheers,
Kay Thomte
Because(i believe) of my active crossover using minidsp 2x4, which has 2vrms input and .9vrms output, I found the volume is not loud enough for some low volume sources. I have a look at the 4ohm speaker and found that the sensitivity(SPL) is more at 97db at 2.83v as opposed to 93db for the 8 ohm one.
My question is will the 4ohms speaker give me louder volume? Will there be any problems with the SET amp on using 4ohm speaker?
I am a begginner. Any help would be appreciated.
The TS parameters for them are attached below.
The links for the details are also given below:
4ohm - Boston Acoustics - HQ48413P - 8" Hi-Q Fullrange Driver - 4 Ohms - Pair
8ohm - Boston Acoustics - HQ48414P - 8" Hi-Q Fullrange Driver - 8 Ohms - Pair
Regards & Cheers,
Kay Thomte
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the two options have the same sensitivity, you'll not get any benefit in loudness from swapping between them assuming that you connect the 4ohm driver to the 4ohm output on your amplifier compared with an 8ohm driver connected to the 8ohm output on your amplifier. However, you could connect a 4ohm speaker to the 8ohm output on the tube amp which will essentially provide some additional voltage gain (not more power) so if your source is not giving you enough voltage you can compensate a bit - but I doubt this will get you what you seek. OR you can try to add a pre-amp; there are relatively inexpensive pre-amps on eBay.
here's the spec. of your amp:
Basic technical parameters:
Rectifier tube: 5Z3PA x 1 (Military level J class tube) HIFI EXQUIS(1101017)
preamp tubes : 6N9P × 2 (Military level J class tube, same then 6SL7)
Power tubes : PSVANE HIFI Serie Black seat version EL34 x 2 (Warranty is six months) HIFI EXQUIS(1101017)
Output power: Ultra-linear connection 10Wx2(default and recommand mode by manufacturer), triode connection 8Wx2, standard connection 12Wx2, tell us if you want to change the default connection mode.
Frequency response : 20Hz - 25KHz HIFI EXQUIS(1101017)
Total power consumption: 115W
Power transformer: 160W
Output transformer: 15w, Japan's Z11 0.35mm(22x50),
Total Harmonic Distortion : 1% (1kHz) HIFI EXQUIS(1101017)
Input Sensitivity : 500mV - 2000mV
Input impedance : 100KΩ
Output Impedance : 4Ω - 8Ω
SNR : 88dB
HIFI EXQUIS(1101017) your best shop HIFI EXQUIS(1101017)
Dimensions (W × H × D ): 380 × 160 × 230mm
Weight: about 9K
Input voltage: 100v-110v/50-60hz OR 220V-230V/50-60h,
HIFI EXQUIS(1101017) offer you US, EU, AU standard power cable, EU and AU cable is the very high quality 0.8-1mm cable
CLC filter inductor
Powoer output transformer is Handmade and quranty by AIQIN brand
Optimized PCB routing and Extremely low noise HIFI EXQUIS(1101017)
It seems that the input sensitivity is up to 2000mV, doesn't say rms or peak though. Either way, 0.9Vrms input won't push it to full power.
here's the spec. of your amp:
Basic technical parameters:
Rectifier tube: 5Z3PA x 1 (Military level J class tube) HIFI EXQUIS(1101017)
preamp tubes : 6N9P × 2 (Military level J class tube, same then 6SL7)
Power tubes : PSVANE HIFI Serie Black seat version EL34 x 2 (Warranty is six months) HIFI EXQUIS(1101017)
Output power: Ultra-linear connection 10Wx2(default and recommand mode by manufacturer), triode connection 8Wx2, standard connection 12Wx2, tell us if you want to change the default connection mode.
Frequency response : 20Hz - 25KHz HIFI EXQUIS(1101017)
Total power consumption: 115W
Power transformer: 160W
Output transformer: 15w, Japan's Z11 0.35mm(22x50),
Total Harmonic Distortion : 1% (1kHz) HIFI EXQUIS(1101017)
Input Sensitivity : 500mV - 2000mV
Input impedance : 100KΩ
Output Impedance : 4Ω - 8Ω
SNR : 88dB
HIFI EXQUIS(1101017) your best shop HIFI EXQUIS(1101017)
Dimensions (W × H × D ): 380 × 160 × 230mm
Weight: about 9K
Input voltage: 100v-110v/50-60hz OR 220V-230V/50-60h,
HIFI EXQUIS(1101017) offer you US, EU, AU standard power cable, EU and AU cable is the very high quality 0.8-1mm cable
CLC filter inductor
Powoer output transformer is Handmade and quranty by AIQIN brand
Optimized PCB routing and Extremely low noise HIFI EXQUIS(1101017)
It seems that the input sensitivity is up to 2000mV, doesn't say rms or peak though. Either way, 0.9Vrms input won't push it to full power.
Last edited:
Bigun, Thanks a lot for the explanation. Appreciate it.
I will try with the 8ohm output when the 4ohms speakers arrives.
I am using it with the aune t1 mk2 dac/pre-amp. The problem is I had to use the
minidsp 2x4 as a crossover, from the output of the aune, which I believe cuts the volume level. On hindsight, I should have bought the minidsp 2x4hd which has the same input and output level.
I will try with the 8ohm output when the 4ohms speakers arrives.
I am using it with the aune t1 mk2 dac/pre-amp. The problem is I had to use the
minidsp 2x4 as a crossover, from the output of the aune, which I believe cuts the volume level. On hindsight, I should have bought the minidsp 2x4hd which has the same input and output level.
Yes, I could not find any mention either. Someone said that it was a continuation of a vintage philips driver. Philips HI Q international speakers
I quite like the sound very much in open baffle crossed at 200hz. Albeit
I have only ever had Mark Audio chr70.3, alpair7p and alpair 10 to compare with.
I quite like the sound very much in open baffle crossed at 200hz. Albeit
I have only ever had Mark Audio chr70.3, alpair7p and alpair 10 to compare with.
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