คู่มือผู้ใช้ลำโพงมอนิเตอร์สตูดิโอ JBL 308P MkII ขนาด 8 นิ้ว

1. บทนำและเรื่องอื่นๆview

The JBL 308P MkII is an 8-inch powered studio monitor designed for professional audio applications. This manual provides essential information for the proper setup, operation, and maintenance of your speakers to ensure optimal performance.

Key features of the JBL 308P MkII include:

• Next-generation JBL transducers for superior transient response and deep bass with lower harmonic distortion.
• New Boundary EQ to restore neutral low-frequency response when speakers are placed near walls or on a work surface.
• Sleek, modern design suitable for any studio environment.
• Broad sweet spot for neutral frequency response across a wide listening area, allowing for accurate mixing even off-axis.

Image 1.1: A pair of JBL 308P MkII 8-inch Studio Monitoring Speakers, showcasing their front design with the JBL logo and drivers.

2. การแกะกล่อง

Carefully unpack your JBL 308P MkII speakers by following these steps:

1. นำกล่องจัดส่งด้านนอกออก
2. Place the inner carton on the floor with the top face upwards.
3. เปิดด้านบนของกล่อง
4. Without removing the internal packaging, turn the carton over so the open end rests on the floor and the bottom of the carton faces you.
5. Gently lift the carton, allowing the speaker and protective end-cap to slide out of the carton and remain on the floor.

Image 2.1: The retail packaging box for the JBL 308P MkII speaker.

Image 2.2: A section of the Quick Setup Guide illustrating the recommended unpacking procedure for the JBL 3 Series MkII speakers.

3. การตั้งค่า

3.1 การจัดวาง

Proper speaker placement is crucial for accurate monitoring. Follow these guidelines:

1. Attach the four supplied pads to the bottom of each speaker to protect the finish of the surface.
2. วางตำแหน่งลำโพงแต่ละตัวในแนวตั้งโดยให้ทวีตเตอร์อยู่ด้านบน
3. Angle the speakers so the high-frequency drivers of each speaker are aimed directly towards your ear.
4. The speakers should be placed so the listening position and the two speakers form an equilateral triangle. Adjusting the distance between the speakers will affect the quality of bass heard at the listening position. Experiment with different positions to find the placement that produces the preferred bass response and stereo image.

Image 3.1: A diagram from the Quick Setup Guide illustrating optimal speaker placement for an equilateral triangle listening setup.

3.2 การเชื่อมต่อเสียง

The JBL 308P MkII offers balanced XLR and 1/4-inch TRS inputs. Use the appropriate cable for your audio source.

1. Connect professional equipment with balanced outputs to the XLR or 1/4-inch TRS input of the speaker using balanced cables. Connect consumer equipment with unbalanced outputs to the 1/4-inch TRS input of the speaker using unbalanced signal cables.
2. Set the INPUT SENSITIVITY switch to the +4 dBu setting for most applications. Set the switch to the -10 dBV setting if the content is distorted or if you find it is too loud.
3. When connecting 3 Series MkII speakers to professional equipment with a +4 dBu nominal output level, to determine the nominal output level of the connected equipment, consult the documentation supplied with the connected equipment.

Image 3.2: The rear panel of the JBL 308P MkII speaker, detailing the balanced XLR and 1/4-inch TRS input jacks, along with the INPUT SENSITIVITY switch.

Image 3.3: A section of the Quick Setup Guide illustrating balanced XLR and 1/4-inch TRS audio connection types.

3.3 การต่อสายไฟ

Connect the speakers to a suitable power source.

1. ตรวจสอบให้แน่ใจว่าสวิตช์เปิดปิดอยู่ในตำแหน่งปิด
2. ต่อสายไฟที่ให้มาเข้ากับเต้ารับที่ด้านหลังของลำโพง
3. ต่อสายไฟเข้ากับเต้ารับไฟฟ้าที่มี

บันทึก:

JBL 3 Series MkII speakers incorporate a universal power supply allowing them to be used worldwide. The ground terminal of the IEC plug on the AC input is for safety grounding and must always be connected to an electrical installation safety ground.

4. ปฏิบัติการ

Once the speakers are properly set up and connected, you can begin operation.

1. หลังจากทำการเชื่อมต่อแล้ว ให้ลดระดับเอาต์พุตของแหล่งกำเนิดเสียง (Mixing Console, Computer Recording System หรือ Preamplifier) to minimum.
2. Set the 3 Series MkII Power Switch to the "ON" position. After a delay of 7 seconds, when the POWER INDICATOR on the front of each speaker illuminates, the speakers are ready to reproduce audio signals.
3. Driver power and audio source gain. Slowly adjust the volume control of connected audio equipment to achieve a suitable listening level.

4.1 แผงควบคุมด้านหลัง

The rear panel of the 308P MkII features several controls for fine-tuning the speaker's response to your environment:

• BOUNDARY EQ: This switch adjusts the low-frequency response to compensate for acoustic issues caused by speaker placement near walls or on a desktop.
• HF TRIM: This switch allows you to adjust the high-frequency output to match your room acoustics or personal preference.
• ปริมาณ: Controls the overall output level of the speaker.

ภาพที่ 4.1: รายละเอียด view of the JBL 308P MkII rear panel, highlighting the BOUNDARY EQ, HF TRIM, and VOLUME controls.

5. การบำรุงรักษา

To ensure the longevity and optimal performance of your JBL 308P MkII speakers, follow these maintenance guidelines:

• การทำความสะอาด: Use a soft, dry cloth to clean the exterior surfaces of the speakers. Avoid using abrasive cleaners, solvents, or waxes, as these can damage the finish.
• การป้องกันฝุ่น: Keep the speakers free from dust. If not in use for extended periods, consider covering them with a dust cover.
• การระบายอากาศ : Ensure that the rear panel and any ventilation ports are not obstructed to allow for proper heat dissipation.
• สภาพแวดล้อม : Avoid exposing the speakers to extreme temperatures, high humidity, or direct sunlight.

6 การแก้ไขปัญหา

If you encounter issues with your JBL 308P MkII speakers, refer to the following common troubleshooting steps:

• ไม่มีเสียง:
  • Check if the power switch is ON and the power indicator is illuminated.
  • Verify all audio cables are securely connected to both the speaker and the audio source.
  • Ensure the volume control on the speaker and the audio source is not set to minimum.
  • Confirm the correct input sensitivity (+4 dBu or -10 dBV) is selected on the rear panel.
• เสียงผิดเพี้ยน:
  • ลดระดับเสียงทั้งจากลำโพงและแหล่งกำเนิดเสียง
  • Check for damaged cables or loose connections.
  • Ensure the audio source output is not clipping or overdriving the speaker input.
• เสียงหึ่งๆ หรือเสียงซ่า:
  • ตรวจสอบให้แน่ใจว่าอุปกรณ์ทั้งหมดมีการต่อสายดินอย่างเหมาะสม
  • Try connecting the speaker to a different power outlet.
  • Use balanced cables (XLR or TRS) if possible, as they are less susceptible to interference.
  • ควรย้ายสายไฟให้ห่างจากสายสัญญาณเสียง

If the issue persists after following these steps, please contact JBL customer support for further assistance.

7. ข้อมูลจำเพาะ

Detailed technical specifications for the JBL 308P MkII 8-inch Studio Monitoring Speakers:

8. การรับประกันและการสนับสนุน

JBL products are designed for reliability and performance. For information regarding warranty coverage, please refer to the warranty card included with your product or visit the official JBL webเว็บไซต์.

หากต้องการความช่วยเหลือด้านเทคนิค บริการ หรือข้อมูลผลิตภัณฑ์เพิ่มเติม โปรดเยี่ยมชม [ลิงก์เว็บไซต์] ฝ่ายสนับสนุน JBL webเว็บไซต์ or contact your local JBL dealer.